Four Sigmatic
Four Sigmatic is a Los Angeles-based functional-mushroom and adaptogen brand known for mushroom coffee. Product labels consistently state a "fruiting body, never mycelium" sourcing claim, corroborated by an independent mycology-focused reviewer, and the company's organic-handling operation carries a registry-confirmed USDA National Organic Program certification through CCOF. Select coffee lines are also marketed as Fair Trade Certified and third-party tested for toxins — both company-reported claims, not registry-confirmed in this research. The 8 mushroom-coffee products available to browse on this page span whole-bean, ground, K-Cup, instant, and latte formats.
Four Sigmatic is a Los Angeles-based mushroom-coffee brand built on a consistent, label-documented "fruiting body, never mycelium" sourcing claim — corroborated by an independent mycology-focused reviewer — paired with a registry-confirmed USDA organic handler certification. The 8 mushroom-coffee products available to browse on this page span whole-bean, K-Cup, instant, and latte formats at a premium price point versus conventional coffee.
Four Sigmatic is a Los Angeles-based functional-mushroom brand with 8 mushroom-coffee products available to browse on this page — whole-bean, ground, K-Cup, instant, and latte formats built around Lion's Mane, Chaga, and adaptogen blends, sold through Amazon for easy reordering. Shoppers choose Four Sigmatic for its consistent "fruiting body, never mycelium" sourcing claim, label-documented across every product sampled directly in this research and corroborated by an independent mycology-focused reviewer, and for a registry-confirmed USDA National Organic Program handler certification (CCOF-listed since 2018) covering the operation's organic handling — though that facility-level certification does not by itself guarantee every individual SKU. Select coffee lines are also marketed as Fair Trade Certified and some products carry Non-GMO Project claims, both company-reported rather than registry-confirmed in this research. Beyond the mushroom-coffee lineup shown here, Four Sigmatic also sells a much broader catalog — capsules, protein powders, elixirs, teas, and cacao — on the brand's own site; that broader range is brand-scoped and not among the 8 products browsable on this page. Label transparency across the brand's wider catalog is mixed rather than uniform: some formulas disclose individual ingredient milligrams while others group actives into named blends with only blend-level totals disclosed. Four Sigmatic is best suited to buyers who want an easy, familiar-format on-ramp into functional mushrooms and are comfortable with premium, subscription-model pricing.
Catalog at a glance
This page covers 8 Four Sigmatic products available to browse, making it practical to compare options and cover several supplement needs from one brand.
Why shoppers choose Four Sigmatic
Mushroom Coffee
Four Sigmatic's fruiting-body-only sourcing claim is label-documented across the products sampled directly in this research and corroborated by an independent mycology-focused reviewer as credible and consistent with the practice, paired with a registry-confirmed USDA organic handler certification (CCOF-listed since 2018) covering the operation's organic handling. All 8 products available to browse on this page fall in this category.
See ranked picks in this category →Format Variety & Named Coffee Sourcing
The 8 products browsable here span whole-bean, ground, K-Cup, instant-packet, and latte formats — all built on the same fruiting-body sourcing standard — with coffee lines tied to named single-origin lots (Honduras Arabica, Peru decaf) and marketed as Fair Trade Certified, a company-reported claim not confirmed via a Fair Trade USA registry search in this research. Shoppers get several ways to buy into the same sourcing standard without needing dedicated brewing equipment for every option.
Who it's best for
Best for
- Shoppers who want an easy, familiar-format on-ramp into functional mushrooms and adaptogens — coffee, lattes, and instant blends — rather than standalone capsules
- Buyers who value a consistent, label-documented "fruiting body, never mycelium" sourcing claim, corroborated by an independent mycology-focused reviewer
- Shoppers comfortable with a premium price point and Four Sigmatic's subscription-based purchasing model
- Buyers who don't need full per-ingredient milligram disclosure on every product in Four Sigmatic's wider catalog — some of its blend-style formulas disclose only blend-level totals rather than individual amounts
Good to know before you choose
- You want extraction-ratio or beta-glucan-percentage disclosure on the label — not currently found on Four Sigmatic's US product pages, per an independent reviewer
- You want single-serving doses that match the human clinical studies cited in the brand's own marketing without needing multiple servings a day — Four Sigmatic's Focus coffee delivers 250 mg Lion's Mane per serving versus the 750 mg/day dose used in the study the brand cites
- You want full per-ingredient milligram disclosure on every product in the lineup — some Four Sigmatic powder-blend products use grouped "blend" labeling instead
- You're highly lead-sensitive — Four Sigmatic has one 2018 California Prop 65 settlement and one independent 2024 lead-detection report on file (see purchase considerations), though the brand reports current batches test well below the regulatory threshold
Pricing & value
Four Sigmatic prices at a premium relative to conventional coffee, with a structural discount for subscribing versus one-time purchase across its lineup (roughly 26-33% off in the pricing sample gathered for this research). That premium buys the fruiting-body sourcing standard and organic-handler certification detailed above rather than clinically-dosed single-ingredient standardization — buyers who want the lowest possible per-milligram cost on a single clinically-dosed active may prefer a dedicated capsule supplement instead.
- Original Mushroom Coffee (30 servings): Observed at $35.00 subscribed / $50.00 one-time (approximately $1.17-$1.67/serving) on the brand's own site, 2026-07-03.
- Sweet Vanilla Plant-Based Protein (30 servings, 2-pack): Observed at $70.00 subscribed / $95.00 one-time ($3.16/serving per the brand) on the brand's own site, 2026-07-03 — sold on the brand's site; not among the 8 mushroom-coffee products browsable on this page.
- Gut Health Mushroom Blend (60 servings, 2-pack): Observed at $42.00 subscribed / $57.00 one-time ($0.95/serving per the brand) on the brand's own site, 2026-07-03 — sold on the brand's site; not among the 8 mushroom-coffee products browsable on this page.
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Explore products from Four Sigmatic
Browse all available products below — filter by category to narrow the list.
Browse Products
Four Sigmatic Focus Ground Coffee
250mg Lion's Mane + 250mg Chaga fruiting body per serving per ground coffee · Lion's Mane + Chaga
USDA Organic dark roast ground coffee with 250mg Lion's Mane + 250mg Chaga per serving. Fair Trade, single origin Honduran beans. Drip brewer or French press.
Four Sigmatic Focus K-Cups (24ct)
250mg Lion's Mane fruiting body + Yacon root per pod per k-cup pod · Lion's Mane + Yacon
USDA Organic K-Cup pods with 250mg Lion's Mane + organic Yacon root per serving. Dark roast, single-origin Honduran beans. 100mg caffeine per pod.
Four Sigmatic Calm Instant Coffee
Proprietary adaptogen blend per packet, 50mg caffeine per instant coffee packet · Reishi + Chaga + Ashwagandha + Eleuthero + Tulsi
Half-caffeine (50mg) instant coffee packets with 5 adaptogens: Reishi, Chaga, Ashwagandha, Eleuthero, Tulsi. USDA Organic, third-party tested for mycotoxins.
Four Sigmatic Dark Roast Whole Bean
250mg Lion's Mane + 250mg Chaga fruiting body per serving per whole bean · Lion's Mane + Chaga
Whole-bean dark roast with 250mg Lion's Mane + 250mg Chaga per serving. USDA Organic, Fair Trade, single-origin Honduran beans. Grind yourself for peak freshness.
Four Sigmatic Cold Brew Coffee Grounds
250mg Lion's Mane fruiting body + Yacon root per serving per ground coffee (coarse) · Lion's Mane + Yacon
Coarse-ground dark roast purpose-built for cold brew. 250mg Lion's Mane + Yacon prebiotic per serving. USDA Organic, GMO-Free, Fair Trade Honduran beans.
Four Sigmatic Original Focus Latte
Lion's Mane fruiting body per serving (dose not publicly disclosed) per instant latte powder · Lion's Mane + Coconut Milk Powder
Plant-based instant latte powder with organic Lion's Mane mushroom + coconut milk creamer. 50mg caffeine. USDA Organic, 5-ingredient minimalist formula.
Four Sigmatic Mocha Focus Latte
Lion's Mane fruiting body per serving (dose not publicly disclosed) per instant latte powder · Lion's Mane + Cacao
Chocolate-mocha instant latte with organic Lion's Mane, real organic cacao, and coconut milk powder. 50mg caffeine. USDA Organic, 6 ingredients.
Four Sigmatic Vanilla Focus Latte
Lion's Mane fruiting body per serving (dose not publicly disclosed) per instant latte powder · Lion's Mane + Vanilla
Vanilla-flavored instant latte with organic Lion's Mane, real organic vanilla, and coconut milk powder. 50mg caffeine. USDA Organic, 6 ingredients.
Quality & transparency details
Fruiting-Body-Only Sourcing (Label-Documented, Independently Corroborated)
Product lineLabel-documentedFour Sigmatic's product labels consistently state "fruiting body, never mycelium" sourcing — no mycelium-on-grain — across every product sampled directly in this research (Original Mushroom Coffee, Focus Organic Capsules, Sweet Vanilla Plant-Based Protein, Gut Health Mushroom Blend), each displaying a "No Filler Mycelium" badge. An independent mycology-focused reviewer with no disclosed affiliation to the brand corroborates this sourcing claim as credible and consistent with the practice, rating it better than most of the retail market the reviewer covered — but the same reviewer notes Four Sigmatic does not disclose extraction ratios or beta-glucan percentages on its US product pages, a transparency gap this profile does not resolve either way. Confirmed for the products sampled in this research; this profile does not extend the finding to the brand's full catalog without further sampling.
USDA Organic — CCOF-Certified Handler (Facility-Scoped)
Facility-specificIndependently documentedFour Sigmatic's operating entity, Four Sigma Foods, Inc., holds an active USDA National Organic Program Handler certification through CCOF (California Certified Organic Farmers, a USDA-accredited certifying agent), in place since September 2018, with EU/UK and US/Canada organic-equivalence listings added in 2019 and 2024. This certifies the operation's organic handling across a broad category scope (beverage mixes, coffee, dietary supplements, extracts, and more) — it is a facility/handler-level certification, not by itself a guarantee that every individual SKU is organic-certified. The four products sampled directly in this research each displayed their own "USDA Certified Organic" product-level claim consistent with this handler status. The federal USDA Organic Integrity Database itself could not be queried directly in this research (a repeated application error); this finding relies on CCOF's own certifying-agent directory instead.
Third-Party Testing Claims — Marketing Language, No Named Lab
Brand-wideCompany-reportedFour Sigmatic states that "every batch" of its mushroom products is tested in a third-party lab for heavy metals, mycotoxins, mold, yeast, pesticides, allergens, and irradiation, and displays a "Tested For Toxins" badge across its site and product pages. No specific named testing laboratory was identified in the sources reviewed for this research, and no public Certificate of Analysis, COA portal, or documented on-request COA process was found. This "every batch" testing claim and the "Tested For Toxins" badge read as brand marketing copy, not a third-party certification.
Label Transparency — Mixed Findings Across a Broader-Catalog Sample
Brand-wideIndependently documentedA 7-product label-transparency sample spanning coffee, capsule, protein, and mushroom-blend-powder formats — drawn from Four Sigmatic's wider catalog, not limited to the 8 mushroom-coffee products browsable on this page — found inconsistent practice rather than one uniform pattern. The brand's Sweet Vanilla Plant-Based Protein (sold on the brand's own site; not among the products browsable here) uses an explicit four-blend proprietary structure disclosing only blend-level totals; its Gut Health Mushroom Blend (also brand-site only, not browsable here) groups mushroom extracts without individual amounts, apart from one disclosed probiotic CFU count; its differently-named Focus Mushroom Blend (brand-site only), by contrast, discloses individual ingredient amounts per serving (500 mg Lion's Mane, 250 mg cordyceps, 200 mg Bacopa Monnieri). Do not generalize either a "no blends" or "always blends" finding across Four Sigmatic's catalog from this sample — the honest finding is mixed, and this sample was not cross-checked against the specific 8 products shown on this page.
Lion's Mane Dosing — Below the Clinical Study the Brand's Own Marketing Cites
Specific productsIndependently documentedAn independent mycology-focused reviewer found that Four Sigmatic's Focus Ground Coffee delivers 250 mg of Lion's Mane extract per serving, while the human clinical study (Mori et al. 2009) the brand's own marketing cites uses a 750 mg/day dose — meaning three or more servings would be needed to approach the studied amount, a distinction the brand's marketing does not make explicit. This dosing observation applies to the specific product reviewed, not asserted as representative of the brand's full catalog.
Our evaluation criteria
Four Sigmatic states that "every batch" of its mushroom products is tested in a third-party lab for heavy metals, mycotoxins, mold, yeast, pesticides, allergens, and irradiation, and displays a "Tested For Toxins" badge across its site. No specific named testing laboratory was identified in the sources reviewed for this research, and no public Certificate of Analysis or COA portal was found. This "every batch" testing claim and the "Tested For Toxins" badge read as brand marketing copy, not a third-party certification.
Practice is mixed across Four Sigmatic's wider catalog, not uniform in either direction. The Sweet Vanilla Plant-Based Protein uses an explicit four-blend proprietary structure disclosing only blend-level totals; the Gut Health Mushroom Blend groups its mushroom extracts without individual amounts, aside from one disclosed probiotic CFU count. By contrast, the differently-named Focus Mushroom Blend discloses individual ingredient amounts per serving (500 mg Lion's Mane, 250 mg cordyceps, 200 mg Bacopa Monnieri). These are products sold on the brand's own site, not among the 8 mushroom-coffee products browsable on this page. Given this mixed finding, this criterion is marked not met rather than assuming full disclosure brand-wide.
An independent mycology-focused reviewer found that Four Sigmatic's Focus Ground Coffee delivers 250 mg of Lion's Mane extract per serving, while the human clinical study (Mori et al. 2009) the brand's own marketing cites uses a 750 mg/day dose — meaning three or more servings would be needed to approach the studied amount, a distinction the brand's marketing does not make explicit. This finding applies to the specific product reviewed, not asserted as representative of every product's dosing.
No public Certificate of Analysis, COA portal, or documented on-request COA process was found in any source reviewed for this research. This reflects the limits of what could be publicly located, not a claim about whether such documentation exists by any means, including on request.
What to check before buying
Lead exposure history: 2018 Prop 65 settlement and a 2024 independent test finding
In a 2018 California Proposition 65 settlement, Four Sigma Foods, Inc. was required to add lead-exposure warnings to three named products — Mushroom Coffee with Lion's Mane & Chaga (Fruity and Medium roasts), Chaga Mushroom Elixir, and Mushroom Matcha Drink Mix with Lion's Mane & Ginger — after lead levels were found to exceed Prop 65's 0.5 microgram/day safe-harbor threshold. The settlement document itself was not read first-hand in this research; this account relies on a secondary synthesis of the public settlement record. Separately, in August 2024, Lead Safe Mama — an independent consumer-advocacy lab-testing operation with no commercial relationship to Four Sigmatic — published a report finding detectable lead in Four Sigmatic's "Think" Organic Coffee; that organization's own laboratory accreditation status was not confirmed in this research, so weigh it as independent consumer-advocacy testing rather than accredited-lab-grade documentation. Four Sigmatic's own current Prop 65 FAQ states batches now test below 0.5 ppm lead and that the warning has been removed from more than 90% of its products — a company-reported claim not corroborated by an outside source in this research. None of these named products have been confirmed as identical to any of the 8 products browsable on this page.
Fair Trade and Non-GMO Project claims are company-reported, not registry-confirmed
Four Sigmatic markets specific coffee lines (Honduras Arabica and Peru decaf lots) as "Fair Trade Certified" — mark terminology associated with Fair Trade USA by reasonable inference, though no direct Fair Trade USA registry listing for Four Sigmatic was found in this research. Some products are also described in marketing and secondary sources as carrying Non-GMO Project status, but this was not confirmed via the Non-GMO Project's own product database in this research. Treat both as company-reported, product-line-scoped claims rather than registry-confirmed certifications.
Subscription-first pricing (observed 2026-07-03)
Four Sigmatic's own pricing observed in this research favors subscription orders: roughly 26-33% cheaper than one-time purchase across the sampled product lines (for example, Original Mushroom Coffee at $35.00 subscribed versus $50.00 one-time for 30 servings, observed 2026-07-03). Shoppers who want a single one-time purchase pay the higher list price and should confirm the subscription terms and cancellation process before checkout.
What this research does not establish
- The USDA Organic Integrity Database (organic.ams.usda.gov) returned an application error on repeated direct-access attempts in this research; the organic-certification finding above relies on CCOF's own certifying-agent directory instead of the federal database itself.
- Fair Trade certification is inferred from "Fair Trade Certified" mark terminology on product marketing, not confirmed via a direct Fair Trade USA registry search; Non-GMO Project status rests on marketing and secondary mentions only, not the Non-GMO Project's own product database.
- The label-transparency sample (7 products) and the fruiting-body/no-filler-mycelium sourcing claim (4 directly-sampled products) cover a good-faith but non-exhaustive slice of Four Sigmatic's much broader catalog (65+ SKUs across roughly 8 navigational categories per the brand's own storefront) — not all of it was sampled, and none of it was cross-checked product-by-product against the specific 8 items browsable on this page.
- The 2018 California Proposition 65 settlement document itself could not be parsed directly by the tooling available in this research; its details rely on a secondary synthesis of the public settlement record rather than a first-hand full-text read. Direct Amazon product-page fetches were also unreliable in this research, and a Trustpilot fetch was blocked; this profile does not rely on review-count or Trustpilot-sourced figures as a result.
- Four Sigmatic's corporate founding date and origin narrative carry an unresolved public discrepancy across sources; this profile does not assert a specific founding year or origin story for that reason. No FDA warning letter, recall, or CPSC enforcement record was located for this brand via the search methods used in this research, which reflects search-method limits rather than certainty of non-existence.
Research last updated: 2026-07-03
Sources
- 1.CCOF (California Certified Organic Farmers) member directory listingFacility-specificIndependently documented
Four Sigma Foods, Inc.'s current registered address on file with its organic certifying agent (CCOF) is 606 Venice Blvd Suite 210, Venice, Los Angeles, CA 90291.
Independent certifier · Accessed 2026-07-03 · Differs in neighborhood name from older secondary-source references to 'Santa Monica' — not resolved whether this reflects a move or reporting imprecision; this profile uses the CCOF-listed Los Angeles address.
CCOF confirms Four Sigma Foods, Inc. holds active USDA National Organic Program Handler certification since 9/21/2018, plus EU & UK Organic Equivalence since 2/27/2019 and US/Canada Organic Equivalence since 1/26/2024, covering a broad handler scope including beverage mixes, coffee, dietary supplements, and extracts.
Independent certifier · Accessed 2026-07-03 · Facility/handler-wide scope; confirms the operation is certified to handle organic products in these categories, not that every individual SKU carries organic certification. The federal USDA Organic Integrity Database returned an application error on direct query.
Four Sigmatic states it uses only log-grown or wildcrafted fruiting-body mushroom extracts and never mycelium, displaying a "No Filler Mycelium" badge; this claim and badge appeared identically on every product page sampled directly (Original Mushroom Coffee, Focus Organic Capsules, Sweet Vanilla Plant-Based Protein, Protect Blend).
Company · Accessed 2026-07-03 · Confirmed only for the products directly sampled in this research, not the full ~65-SKU catalog.
An independent mycology-focused reviewer corroborates Four Sigmatic's fruiting-body-only sourcing as credible and consistent over multiple years, but finds that extraction ratios and beta-glucan percentages are not disclosed on Four Sigmatic's US product pages.
Other · Accessed 2026-07-03 · Single independent reviewer's assessment, not a laboratory panel or registry; reviewer's own methodology/credentials were not independently vetted beyond the published article.
- 5.mycologyathome.com — "Four Sigmatic Review: Honest Deep Dive"Specific productsIndependently documented
Four Sigmatic's Focus Ground Coffee delivers 250 mg of Lion's Mane extract per serving, while the human clinical study (Mori et al. 2009) cited in the brand's own marketing used a 750 mg/day dose.
Other · Accessed 2026-07-03 · Applies specifically to the Focus Ground Coffee SKU as reviewed, not asserted as representative of every product's dosing.
Four Sigmatic states that "every batch" of its products is tested in third-party laboratories for heavy metals, mycotoxins, mold, yeast, pesticides, allergens, and irradiation, displaying a "Tested For Toxins" badge.
Company · Accessed 2026-07-03 · Company's own claim; no named laboratory or independent audit located.
No specific named third-party testing laboratory was identified in any source accessed for this research, despite the brand's repeated "third-party tested" claims.
Company · Accessed 2026-07-03 · Absence check across multiple pages; not proof no such lab exists, only that none was disclosed in the sources reached.
- 8.Four Sigmatic "Product Quality" page and general web search for COA referencesBrand-wideLimited public information
No public Certificate of Analysis, COA portal, or documented on-request COA process was found or referenced in any source accessed for Four Sigmatic in this research.
Company · Accessed 2026-07-03 · This finding should not be read or extended as evidence of COA availability by any means, including on request.
Four Sigmatic's Sweet Vanilla Plant-Based Protein uses an explicit "proprietary blend" label structure — four named blends — with only blend-level totals disclosed and individual component amounts not disclosed.
Company · Accessed 2026-07-03 · Sold on the brand's own site; not among the 8 mushroom-coffee products browsable on this page.
- 10.Four Sigmatic product page — Protect Blend (Gut Health Mushroom Blend)Specific productsLabel-documented
Four Sigmatic's Gut Health Mushroom Blend / Protect Blend groups mushroom extracts under a blend name without disclosing individual per-ingredient amounts, though it discloses one specific probiotic CFU count as a partial exception.
Company · Accessed 2026-07-03 · Sold on the brand's own site; not among the 8 mushroom-coffee products browsable on this page.
- 11.Secondary summary of Four Sigmatic Focus Organic Mushroom Blend product listingSpecific productsLabel-documented
Four Sigmatic's Focus Mushroom Blend (powder) discloses individual ingredient amounts per serving: 500 mg Lion's Mane extract, 250 mg cordyceps extract, and 200 mg Bacopa Monnieri extract.
Company · Accessed 2026-07-03 · Obtained via WebSearch synthesis rather than a first-hand direct page fetch; sold on the brand's own site, not among the 8 mushroom-coffee products browsable on this page.
Four Sigmatic's Original Mushroom Coffee (30 servings) is priced at $35.00 subscribed / $50.00 one-time on the official site.
Company · Accessed 2026-07-03 · Observed/approximate list price on research date; not cross-shopped against a sourced category-average figure.
Four Sigmatic's Sweet Vanilla Plant-Based Protein (30 servings, 2-pack) is priced at $70.00 subscribed / $95.00 one-time, stated by the brand as $3.16 per serving.
Company · Accessed 2026-07-03 · Sold on the brand's own site; not among the 8 mushroom-coffee products browsable on this page.
- 14.Four Sigmatic product page — Protect Blend (Gut Health Mushroom Blend)Specific productsLabel-documented
Four Sigmatic's Gut Health Mushroom Blend (60 servings, 2-pack) is priced at $42.00 subscribed / $57.00 one-time, stated by the brand as $0.95 per serving.
Company · Accessed 2026-07-03 · Sold on the brand's own site; not among the 8 mushroom-coffee products browsable on this page.
- 15.Amazon product listing (Four Sigmatic Organic & Fair Trade Mushroom Ground Coffee, Honduras Arabica)Product lineCompany-reported
Four Sigmatic markets specific coffee product lines (Honduras Arabica lots, Peru decaf lots) as "Fair Trade Certified"; the mark terminology is associated with Fair Trade USA by reasonable inference, not a confirmed registry listing.
Retailer · Accessed 2026-07-03 · Applies to specific coffee SKUs only; no direct Fair Trade USA registry listing for Four Sigmatic was found in this research. Treated as company-reported per adjudication, not as a confirmed certification.
Some Four Sigmatic products are described in marketing and secondary sources as carrying Non-GMO Project status, but this was not confirmed via the Non-GMO Project's own product database.
Company · Accessed 2026-07-03 · The Non-GMO Project's own product database was not successfully queried directly in this session; company/marketing-level claim only.
- 17.California Attorney General — Proposition 65 settlement recordSpecific productsIndependently documented
In a 2018 California Proposition 65 settlement, Four Sigma Foods, Inc. was required to add lead-exposure warnings to three named products after lead exposure was found to exceed the regulation's 0.5 microgram/day safe-harbor threshold.
Regulator · Accessed 2026-07-03 · Applies only to the three named products, not brand-wide; the settlement PDF itself could not be parsed directly by available tooling — this account relies on a search-engine's secondary synthesis of the primary document.
- 18.Lead Safe Mama — "Four Sigmatic Think Organic Coffee tests positive for Lead — August 2024 Lab Report"Specific productsIndependently documented
Lead Safe Mama, LLC, an independent consumer-advocacy lab-testing operation with no commercial relationship to Four Sigmatic, published an August 2024 report finding detectable lead in Four Sigmatic's "Think" Organic Coffee.
Other · Accessed 2026-07-03 · Independent of the brand, but Lead Safe Mama's own laboratory accreditation status was not confirmed in this research — weigh as independent consumer-advocacy testing, not accredited-lab-grade documentation.
Four Sigmatic's own current Prop 65 FAQ states that each batch of its products now contains less than 0.5 ppm lead and that the Prop 65 warning has been removed from more than 90% of its products.
Company · Accessed 2026-07-03 · Self-reported current status by the party subject to the original 2018 settlement; not corroborated by an outside source in this research.
Four Sigmatic's US storefront lists approximately 65 or more distinct SKUs across roughly eight navigational categories (Coffees, Creamers, Proteins, Teas & Cocoas, Supplements, Starter Kits, Bundles).
Company · Accessed 2026-07-03 · Reflects the brand's own storefront listing on the research date, not a registry or independent audit; distinct from and much broader than the 8 mushroom-coffee products browsable on this page, which come from repo data, not this figure.
- 21.FDA Warning Letters, FDA Enforcement Reports, and CPSC Recalls resources (general search)Brand-wideLimited public information
No FDA warning letter and no FDA/CPSC recall or enforcement report were located for Four Sigmatic / Four Sigma Foods, Inc. via search of FDA's Warning Letters and Enforcement Report resources and CPSC's recall database.
Regulator · Accessed 2026-07-03 · These federal search tools are not fully text-searchable by the methods used here; reflects search-method limits, not certainty of non-existence.
Frequently Asked Questions
Is Four Sigmatic's mushroom sourcing independently corroborated?
Is Four Sigmatic's mushroom sourcing independently corroborated?
Four Sigmatic's product labels consistently state a "fruiting body, never mycelium" sourcing claim, displaying a "No Filler Mycelium" badge across every product sampled directly in this research. An independent mycology-focused reviewer with no disclosed affiliation to the brand corroborates this sourcing practice as credible and consistent, though the same reviewer notes that extraction ratios and beta-glucan percentages are not disclosed on Four Sigmatic's US product pages — a transparency gap this research does not resolve either way.
Does Four Sigmatic's Lion's Mane dose match the clinical research it cites?
Does Four Sigmatic's Lion's Mane dose match the clinical research it cites?
Not fully, per an independent mycology-focused reviewer: Four Sigmatic's Focus Ground Coffee delivers 250 mg of Lion's Mane extract per serving, while the human clinical study (Mori et al. 2009) the brand's own marketing cites used a 750 mg/day dose — meaning three or more servings would be needed to approach the studied amount, a distinction the brand's marketing does not make explicit. This finding applies to the specific product reviewed, not asserted as representative of every product.
Is Four Sigmatic USDA Organic certified?
Is Four Sigmatic USDA Organic certified?
Four Sigmatic's operating entity holds an active USDA National Organic Program Handler certification through CCOF (a USDA-accredited certifying agent), in place since 2018. This certifies the operation's organic handling across a broad category scope — it's a facility-level certification, not by itself a guarantee that every individual SKU carries organic certification, though the products sampled directly in this research each displayed their own "USDA Certified Organic" label claim consistent with this status.
Does Four Sigmatic publish Certificates of Analysis?
Does Four Sigmatic publish Certificates of Analysis?
No public Certificate of Analysis, COA portal, or documented request process was found in this research. Four Sigmatic states that "every batch" is tested in a third-party lab for toxins and displays a "Tested For Toxins" badge, but no specific named testing laboratory was identified in the sources reviewed — treat this as brand marketing language, not a third-party certification.
Has Four Sigmatic had any lead-related issues?
Has Four Sigmatic had any lead-related issues?
Yes, two separate items are on record. In a 2018 California Proposition 65 settlement, Four Sigma Foods, Inc. was required to add lead-exposure warnings to three named products after lead levels were found to exceed the regulation's safe-harbor threshold. Separately, in August 2024, Lead Safe Mama — an independent consumer-advocacy testing operation — published a report finding detectable lead in Four Sigmatic's "Think" Organic Coffee. Four Sigmatic's own current Prop 65 FAQ states batches now test below 0.5 ppm lead and that the warning has been removed from more than 90% of its products, a company-reported claim not corroborated by an outside source in this research.
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