Double Wood Supplements
Double Wood Supplements is a nootropic-, mineral-, and foundational-supplement brand sold through Amazon, with 6 products available to browse on this page: Alpha GPC, Chromium Picolinate, Magnesium Malate, Citrus Bergamot, Alpha Lipoic Acid, and Myo-Inositol. Each states a single active ingredient at a clearly disclosed per-serving dose. The brand's standout research finding is a public, product-specific Certificate of Analysis confirmed live on every one of 10 sampled product pages, naming NutraSolutions USA as the testing lab on at least one — brand-commissioned documents hosted on the brand's own site, not an independent certification program. Double Wood's own wider catalog (roughly 161 listings) spans nootropics, longevity compounds, and other categories not available to browse on this page. Manufacturing is described as occurring in an FDA-registered, cGMP facility — a facility-registration claim, not an independent GMP certification — and this research found no NSF, USP, Informed Sport, or Non-GMO Project registry certification for the brand.
Double Wood Supplements' standout signal is genuine label-level transparency: a public, product-specific Certificate of Analysis was confirmed live on every one of 10 sampled product pages, and the 6 products sold on this page each disclose a single active ingredient at one clearly stated per-serving dose. It suits shoppers who want straightforward, checkable nootropic, mineral, and foundational-health capsules at accessible mid-market prices rather than brand-wide independent registry certification.
Double Wood Supplements sells 6 products available to browse on this page — Alpha GPC, Chromium Picolinate, Magnesium Malate, Citrus Bergamot, Alpha Lipoic Acid, and Myo-Inositol — spanning cognitive support, mineral and metabolic support, heart health, antioxidant, and women's hormonal-health categories, each stating one active ingredient at a clearly disclosed per-serving dose. The brand's own wider catalog is considerably larger (roughly 161 listings observed on its own site, alongside a company-stated '200+ SKU' figure), with additional nootropic and longevity-compound lines not available to browse on this page. This research's clearest finding is a public, product-specific Certificate of Analysis confirmed live on all 10 individual product pages sampled — no login, account, or request required — naming NutraSolutions USA as the testing lab on at least one; these are brand-commissioned lab documents hosted on Double Wood's own site rather than an independent certification program, and the sample does not cover the full catalog. Double Wood states every product is third-party tested, but this research found no NSF, USP Verified, Informed Sport/Choice, or Non-GMO Project registry certification anywhere for the brand. All 6 products on this page are sold through Amazon, where flagship SKUs carry review counts in the thousands, and pricing sits in a typical mid-market band (about $9-$25 across this page's products, roughly $0.12-$0.83 per serving) — accessible relative to premium-tier competitors, without the certification depth some of those competitors carry.
Catalog at a glance
This page covers 6 Double Wood Supplements products available to browse across 6 categories, making it practical to compare options and cover several supplement needs from one brand.
Why shoppers choose Double Wood Supplements
Nootropic & Cognitive Support
Alpha GPC (600mg per serving) is Double Wood's flagship cognitive-support product on this page, matching the standard clinical-trial dose in one serving and carrying thousands of Amazon reviews — a straightforward, fully-dosed choline option for shoppers building a nootropic routine.
See ranked picks in this category →Mineral & Metabolic Support
Magnesium Malate and Chromium Picolinate give shoppers two clearly-dosed mineral options from one brand — 225mg elemental magnesium plus malic acid in one serving, and a full 1,000mcg chromium picolinate dose in the other — both at accessible per-serving prices.
See ranked picks in this category →Heart Health / Cholesterol Support
Citrus Bergamot (1,000mg standardized extract per serving) gives shoppers a single-ingredient option for this category at a fully disclosed dose, backed by thousands of Amazon reviews on the specific listing.
Women's Hormonal & Antioxidant Support
Myo-Inositol (1,000mg per capsule, no fillers) and Alpha Lipoic Acid (600mg per serving) round out the page with two more single-ingredient, fully-dosed options, each carrying a strong Amazon review base for its category.
See ranked picks in this category →Who it's best for
Best for
- Shoppers who want a specific single-ingredient nootropic, mineral, or foundational-health capsule with one clearly stated milligram dose on the label — the format used by all 6 products sold on this page
- Buyers who want to check a product's own Certificate of Analysis before purchasing — Double Wood publishes one, product-specific, confirmed live on every one of 10 sampled pages
- Price-conscious shoppers comfortable with mid-market pricing (roughly $9-$25 across this page's products) rather than premium-tier positioning
- Buyers who purchase through Amazon and want an established catalog — flagship SKUs on this page carry review counts in the thousands
Good to know before you choose
- You want a brand with independent registry certification (NSF, USP Verified, Informed Sport/Choice, or Non-GMO Project) — none was found for Double Wood in this research
- You want every product in Double Wood's full catalog to itemize individual per-ingredient amounts — a research sample outside this page's 6 products found some combined-dose, multi-ingredient formats elsewhere in the brand's catalog
- You're highly sensitive to past marketing-claims regulatory history — Double Wood has a dated FDA warning letter and a Prop 65 settlement on record (see purchase considerations)
Pricing & value
Double Wood prices in a typical mid-market band across this page's 6 products (roughly $9-$25, about $0.12-$0.83 per serving) — more accessible than premium-tier competitors, in exchange for a lighter independent-certification footprint than some of those competitors carry. Compare a specific product's per-serving price against a comparable premium alternative, and weigh that against the certification gap noted in quality signals, before choosing on price alone.
- Magnesium Malate 1500mg (180 capsules): $14.95 (about $0.12/serving) — the lowest per-serving cost among this page's 6 products, per this site's product data (updated 2026-06-27).
- Alpha GPC 600mg (60 capsules): $19.95 (about $0.33/serving), per this site's product data (updated 2026-06-27) — matching the brand's own directly observed site price for the same product on 2026-07-03.
- Citrus Bergamot 1000mg (60 capsules): $24.95 (about $0.83/serving) — the highest per-serving price among this page's 6 products, reflecting the standardized-extract format, per this site's product data (updated 2026-06-27).
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Explore products from Double Wood Supplements
Browse all available products below — filter by category to narrow the list.
Browse Products
Double Wood Citrus Bergamot 1000mg (NSF Certified)
1000mg Citrus Bergamot (Bergamonte) per 2-capsule serving per capsule · Citrus Bergamia Risso Fruit Extract (Bergamonte patented standardization)
Citrus Bergamot extract at 1000mg per 2-capsule serving using Bergamonte patented standardization. NSF Certified. Supports healthy cholesterol and triglyceride levels. 30-day supply.
Quality & transparency details
Public, Product-Specific Certificates of Analysis (10-of-10 Sampled)
Brand-wideIndependently documentedDirect inspection of 10 individual Double Wood product pages — Phosphatidylserine, Maca Root, Dihydromyricetin, Tongkat Ali Extract, KSM-66 Ashwagandha, Alpha GPC, Magnesium L-Threonate, TUDCA, a GLP-1 supplement, and Magnesium Complex — found a live, freely clickable 'View Certificate of Analysis' PDF on every single one, with no login, account, or contact request required. One page names NutraSolutions USA (Deer Park, NY) as the testing lab; these are brand-commissioned lab documents hosted on Double Wood's own site, not an independent third-party certification program, and the sample covers 10 of a much larger (roughly 161-listing) catalog — not confirmed brand-wide.
Brand-Wide 'Third-Party Tested' Claim vs. Confirmed Practice
Brand-wideCompany-reportedDouble Wood's marketing states every product is third-party tested for heavy metals and microbial contamination. This research directly confirmed public per-product lab documents on the 10 sampled pages above, but found no NSF, USP Verified, Informed Sport/Choice, or Non-GMO Project registry listing for the brand, and could not confirm the named lab's (NutraSolutions USA) specific ISO/IEC 17025:2017 accreditation number against A2LA's or ANAB's own public directories.
Label Transparency — Single-Ingredient Dosing (11-Product Sample)
Brand-wideLabel-documentedAcross an 11-product sample spanning nootropic, mineral, herbal, longevity, and metabolism categories, 9 used a single active ingredient at one clearly stated milligram dose per serving; 2 — a magnesium complex and a mushroom-gummy blend, neither sold on this page — named every ingredient but combined the total dose rather than itemizing individual amounts. All 6 products available on this page (Alpha GPC, Chromium Picolinate, Magnesium Malate, Citrus Bergamot, Alpha Lipoic Acid, and Myo-Inositol) use the single-ingredient, fully-itemized format. This is an 11-product sample against a much larger catalog, not a full-catalog audit.
No NSF, USP, Informed Sport, or Non-GMO Project Certification Found
Brand-wideLimited public informationThis research did not find Double Wood listed in NSF's GMP-facility or Certified for Sport registries, the USP Verified Mark program, the Informed Sport/Informed Choice registry, or the Non-GMO Project's Product Verification Program; 'Non-GMO' appears on some product pages only as a self-declared label claim. One product browsable on this page — Citrus Bergamot — carries an 'NSF Certified' claim in its own retail listing name and description; NSF's separate product-certification (Contents Certified) registry was not among the databases this research could query, so that product-level claim is treated as company/label-reported pending direct registry confirmation. ConsumerLab's public brand report card is described by secondary sources as 6 products tested (4 Approved, including 2 Top Picks, and 2 Not Approved), but ConsumerLab.com itself returned an access error on direct fetch and this figure was not independently re-confirmed.
BBB-Accredited Business Record (A+ Rating)
Brand-wideIndependently documentedThe Better Business Bureau's own profile for Double Wood Supplements shows Accredited Business status (as of 8/12/2025) with a current A+ rating, and independently corroborates the company's stated 2013 founding year with a registered start date of 4/24/2013.
Our evaluation criteria
Double Wood states every product is tested by an independent lab for heavy metals and microbial contamination. This research directly confirmed public, product-specific lab documents on 10 sampled product pages, naming NutraSolutions USA as the testing lab on at least one — but found no NSF, USP Verified, Informed Sport/Choice, or Non-GMO Project registry certification anywhere for the brand, and could not confirm NutraSolutions USA's specific accreditation number in outside registries.
All 6 products sold on this page state one active ingredient at a single, clearly disclosed per-serving dose. A separate 11-product sample of Double Wood's wider catalog found the same single-ingredient format on 9 products and a combined-dose (but fully ingredient-named) format on 2 others not sold on this page — a magnesium complex naming 8 forms of magnesium as one combined total, and a mushroom-gummy blend naming 5 species as one combined total. The brand's "no proprietary blends" claim across its full catalog is a company policy statement, not an audited fact.
Each of the 6 products sold on this page states a specific per-serving dose on its label: Alpha GPC 600mg, Chromium Picolinate 1,000mcg, Magnesium Malate providing 225mg elemental magnesium, Citrus Bergamot 1,000mg (Bergamonte standardization), Alpha Lipoic Acid 600mg, and Myo-Inositol 1,000mg per capsule. These are label-read doses, not a systematic comparison against the published dose-response literature for each ingredient.
This research directly confirmed a public, freely clickable Certificate of Analysis PDF on all 10 individual Double Wood product pages sampled — no login, account, or request required — naming NutraSolutions USA as the testing lab on at least one. These are brand-commissioned lab documents hosted on Double Wood's own site, not an independent certification program, and the sample covers 10 of a much larger (roughly 161-listing) catalog, not a confirmed brand-wide practice.
What to check before buying
2020 FDA warning letter — hangover-product marketing claims (Dycetin)
In July 2020, the FDA warned Double Wood LLC that marketing for its Dycetin (dihydromyricetin) product — including claims to 'prevent hangovers' and 'protect your liver and brain' — established the product as an unapproved new drug; Double Wood was one of seven companies warned in a coordinated FDA action that month. Current marketing for the same product line uses softer, hedged language ('may help support healthy liver function') rather than the definitive claims cited in 2020. This product is not among the 6 products sold on this page.
2025 California Proposition 65 settlement — lead in four named products
Double Wood settled a California Proposition 65 enforcement matter in May 2025, paying $30,000 total ($2,000 civil penalty plus $28,000 in attorneys' fees/costs) over a notice alleging lead exposure in four specific products — Astragalus, Marshmallow Root, Psyllium Husk, and Bee Pollen — and agreeing to warning-compliance terms for California distribution. This is a civil labeling/warning matter, not a product-safety recall, and is scoped to these four named products; none is among the 6 products sold on this page.
What this research does not establish
- ConsumerLab's reported brand report card (6 products tested, 4 Approved including 2 Top Picks, 2 Not Approved) rests on secondary-source description; ConsumerLab.com's own page returned an access error on three direct-fetch attempts and was not independently re-confirmed.
- Label-transparency (11 products) and public-COA (10 products) sampling in this research covered a small fraction of Double Wood's roughly 161-listing catalog; findings should not be extended brand-wide without further sampling.
- The named testing lab's (NutraSolutions USA) specific ISO/IEC 17025:2017 accreditation number could not be independently confirmed against A2LA's or ANAB's own public accreditation directories — a database/tooling access limitation, not a negative finding.
- Double Wood's ownership changed hands in January 2026, roughly 5.5 months before this research date; independent public reporting on the brand under its current ownership is necessarily limited so far.
Research last updated: 2026-07-03
Sources
- 1.Double Wood Supplements product pages (10 sampled: Phosphatidylserine, Maca Root, Dihydromyricetin, Tongkat Ali Extract, KSM-66 Ashwagandha, Alpha GPC, Magnesium L-Threonate, TUDCA, GLP-1 Supplement, Magnesium Complex)Brand-wideIndependently documented
Direct inspection of 10 individual Double Wood product pages found a live, publicly clickable 'View Certificate of Analysis' PDF link on every one, requiring no login, account, or contact request
Company · Accessed 2026-07-03 · The Phosphatidylserine page names NutraSolutions USA (Deer Park, NY) and cites ISO/IEC 17025:2017 Accreditation No. 113907; the Magnesium L-Threonate page links a dated (02/21/2025), lot-numbered test-results document confirming label potency via USP 38 Titration. Sample of 10 of a roughly 161-listing catalog.
- 2.Double Wood Supplements FAQ page, 'Are Double Wood supplements third-party tested?'Brand-wideIndependently documented
A Double Wood FAQ-style page states Certificates of Analysis are 'available to consumers upon request,' directly contradicted by the live, no-request-needed public COA links found on all 10 sampled product pages
Company · Accessed 2026-07-03 · Internal brand-content inconsistency, both sides directly observed in this research; most likely stale/inconsistent copy on this one help page rather than an actual access barrier. Resolved here in favor of the directly-observed public-link practice.
- 3.IndustryNet business-directory listing for NutraSolutions USA; A2LA public accreditation directory (search attempt)Facility-specificIndependently documented
NutraSolutions USA is independently confirmable as a real, physically located contract-testing company at 1 Saxwood Street, Deer Park, NY; its specific claimed ISO/IEC 17025:2017 accreditation number could not be independently verified against A2LA's or ANAB's own public directories
Other · Accessed 2026-07-03 · A2LA's directory search tool returned an empty/JS-driven results page when queried — a tooling limitation, not a negative finding on the accreditation itself.
Double Wood's marketing consistently describes 'every product' as third-party tested for heavy metals and microbial contamination, and manufactured in an FDA-registered, cGMP facility
Company · Accessed 2026-07-03 · FDA registration is a facility-listing requirement, not an approval or independent audit; no independently-certifying GMP body (e.g. NSF/ANSI 455, NPA GMP) was named anywhere in this research.
- 5.NSF International GMP registry and NSF Certified for Sport product searchBrand-wideLimited public information
No NSF listing (GMP-registered facility or Certified for Sport product) was found for Double Wood Supplements or Double Wood LLC
Independent certifier · Accessed 2026-07-03 · Absence check across two related NSF registry search tools; reasonably strong but not airtight proof of non-listing.
No listing was found indicating any Double Wood product holds the USP Verified Mark
Independent certifier · Accessed 2026-07-03 · Corroborated by multiple independent secondary reviews separately noting the absence of USP/NSF certification.
No listing was found indicating Double Wood or any of its products participate in the Informed Sport or Informed Choice certification programs
Independent certifier · Accessed 2026-07-03
- 8.Non-GMO Project Product Verification Program (general search); Double Wood product pagesBrand-wideLimited public information
No Non-GMO Project (registry) verification was found for Double Wood; 'Non-GMO' appears on sampled product pages only as a self-declared label claim, not a registry-verified (butterfly-logo) certification
Independent certifier · Accessed 2026-07-03 · Self-declared 'Non-GMO' is a company claim only and should not be presented as third-party-verified.
- 9.ConsumerLab.com brand page (accessed indirectly via secondary sources)Brand-wideIndependently documented
ConsumerLab.com's public brand report card for Double Wood is described (via secondary sources) as showing 6 products tested, 4 Approved (2 of which are Top Picks), and 2 Not Approved
Independent certifier · Accessed 2026-07-03 · ConsumerLab.com's own page returned an access error on three direct-fetch attempts; figure corroborated across two independently-worded secondary sources but not first-hand re-read — a lead requiring live re-verification, not a confirmed fact.
Healthline's editorial review corroborates a single-ingredient product focus and GMP-only certification (explicitly noting the absence of USP or NSF certification), while cautioning that some health claims are not well supported by research and some products contain unnecessarily high doses
Press · Accessed 2026-07-03 · Secondary editorial reporting, used here as corroborating context alongside this research's own direct registry checks.
BBB lists Double Wood Supplements as an Accredited Business (as of 8/12/2025) with an A+ rating, and independently lists a start date of 4/24/2013, corroborating the company's own founding-year claim
Other · Accessed 2026-07-03 · Directly-fetched result; used per adjudication in place of a secondary source's conflicting rating claim.
Across 11 directly sampled Double Wood product pages, 9 used single-active-ingredient formulas with individually disclosed doses, while 2 used a combined-total blend format (a magnesium complex naming 8 forms of magnesium at a combined total, and a mushroom-gummy blend naming 5 species at a combined total)
Company · Accessed 2026-07-03 · 11-product sample out of a roughly 161-listing catalog, not exhaustive; neither combined-total product is sold on this page. Not evidence of a hidden-ingredient proprietary blend — all named ingredients are disclosed, only per-component amounts are combined.
Double Wood's own live product-listing page displayed 'Show 161 results' across its all-products collection at the time of this research, broadly consistent with a PE-sponsor-reported '150+ SKU' figure
Company · Accessed 2026-07-03 · This site's own browsable-count for this brand (6 products) comes from repo data, not this figure; the 161/'200+ SKU' figures describe the brand's own storefront only.
- 14.FDA Warning Letter, 'Double Wood LLC - 593766 - 07/23/2020'Specific productsIndependently documented
FDA issued a warning letter to Double Wood LLC on July 23, 2020, stating that marketing claims for its Dycetin (dihydromyricetin) product established the product as an unapproved new drug
Regulator · Accessed 2026-07-03 · Direct re-fetch of the FDA letter page returned an error in this session; corroborated via FDA's own constituent-update announcement and contemporaneous trade press naming Double Wood among seven companies warned in a coordinated action.
Double Wood's current product page for its dihydromyricetin (DHM) product uses supportive, hedged language rather than the definitive hangover-prevention claims cited in the 2020 FDA warning letter
Company · Accessed 2026-07-03 · Direct observation of current marketing copy only, not a legal compliance determination.
- 16.California Attorney General Proposition 65 60-day notice detail page (Notice 2025-00545)Product lineIndependently documented
Double Wood LLC settled a California Proposition 65 enforcement matter (Notice 2025-00545, filed 2/19/2025) alleging lead in four named products, paying $30,000 total on May 15, 2025 and agreeing to warning-compliance terms
Regulator · Accessed 2026-07-03 · Scoped to four named products only (Astragalus, Marshmallow Root, Psyllium Husk, Bee Pollen), none of which are sold on this page; a civil labeling/warning matter, not an FDA safety action.
- 17.Double Wood product catalog data (Amazon listings), as recorded in this site's contentSpecific productsLabel-documented
This site's product data records Alpha GPC 600mg at $19.95, Chromium Picolinate 1000mcg at $8.95, Magnesium Malate 1500mg at $14.95, Citrus Bergamot 1000mg at $24.95, Alpha Lipoic Acid 600mg at $9.95, and Myo-Inositol 1000mg at $9.95
Retailer · Accessed 2026-06-29 · Site catalog data snapshot; the brand's own directly-observed site price for Alpha GPC ($19.95, accessed 2026-07-03) independently matches this figure.
- 18.Double Wood product catalog data (Amazon review counts), as recorded in this site's contentSpecific productsLabel-documented
This site's product data records Amazon review counts in the low thousands for this page's flagship products (e.g., Alpha GPC 5,248, Citrus Bergamot 5,371, Magnesium Malate 3,689, Chromium Picolinate 3,067)
Retailer · Accessed 2026-06-29 · Popularity signal only, never a quality or efficacy signal.
Frequently Asked Questions
Are Double Wood's Certificates of Analysis actually public?
Are Double Wood's Certificates of Analysis actually public?
Yes, on the products checked in this research. One Double Wood help page states COAs are "available to consumers upon request," but direct inspection of 10 individual product pages found a live, freely clickable "View Certificate of Analysis" PDF link on every one — no login, account, or request needed. These are brand-commissioned lab documents hosted on Double Wood's own site (one names NutraSolutions USA as the testing lab), not an independent certification program, and this sample covers 10 of a much larger catalog.
Is Double Wood Supplements third-party tested or registry-certified?
Is Double Wood Supplements third-party tested or registry-certified?
Double Wood states every product is tested by an independent lab, and this research directly confirmed public, product-specific lab documents on 10 sampled pages. However, this research found no NSF, USP Verified, Informed Sport/Choice, or Non-GMO Project registry certification for the brand, and could not confirm the named lab's specific accreditation number in outside registries.
Does Double Wood use proprietary blends?
Does Double Wood use proprietary blends?
All 6 products sold on this page — Alpha GPC, Chromium Picolinate, Magnesium Malate, Citrus Bergamot, Alpha Lipoic Acid, and Myo-Inositol — state one active ingredient at a single, fully disclosed per-serving dose. A separate 11-product research sample of Double Wood's wider catalog found 9 products in the same single-ingredient format and 2 (not sold on this page) that name every ingredient but combine the total dose rather than breaking out individual amounts.
Who owns Double Wood Supplements?
Who owns Double Wood Supplements?
Double Wood's majority ownership changed hands in January 2026: Gryphon Investors, a private equity firm, acquired the company from Boyne Capital, which had held a majority stake since a January 2021 investment. This is a recent, publicly announced transaction; independent reporting on the brand under its new ownership is still limited.
Where are Double Wood products manufactured?
Where are Double Wood products manufactured?
Double Wood states its products are manufactured in the USA in an FDA-registered facility that follows Good Manufacturing Practices (GMP). FDA registration is a facility-listing requirement, not an independent audit or certification, and this research did not find an independently-certifying GMP body (such as NSF/ANSI 455 or an NPA GMP Certification) named for Double Wood or its manufacturer.
This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer