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Science-Verified Brand

Thorne

Thorne is a premium supplement brand trusted by Mayo Clinic, Cleveland Clinic, and 11 U.S. Olympic teams. NSF Certified for Sport across their athletic line, with every product third-party tested.

Founded 1984New York, NY155 products
·
Third-Party TestedNo Proprietary BlendsClinical DosingPublished COAs4/4 Verified

Thorne meets our Science-Verified criteria with NSF Certified for Sport products, full ingredient disclosure, clinical...

Thorne meets our Science-Verified criteria with NSF Certified for Sport products, full ingredient disclosure, clinical dosing backed by Mayo Clinic research partnership, and published COAs.

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THORNE - Vitamin D-5,000 - Vitamin D3 Supplement - Supports Healthy Bones, Teeth & Muscles, Plus Car CapsuleVitaminsCapsule

THORNE - Vitamin D-5,000 - Vitamin D3 Supplement - Supports Healthy Bones, Teeth & Muscles, Plus Car

NSF Certified for Sport

- Vitamin D-5,000

Vitamin D-5,000 — Vitamin D3 Supplement - Supports Healthy Bones, Teeth & Muscles, Plus Cardiovascular & Immune Function* - NSF Certified for Sport -

4.8 (9,107)
$20.00$0.33/serving
VitaminsLiquid

THORNE - Vitamin D + K2 Liquid with a Metered Dispenser - Vitamins D3 & K2 to Support Healthy Bones

NSF Certified for Sport, NSF GMP

- Vitamin D + K2 Liquid with a Metered Dispenser

Vitamin D + K2 Liquid with a Metered Dispenser — Vitamins D3 & K2 to Support Healthy Bones & Muscles* - 1 Fl Oz (30 ml) - 600 Servings

4.4 (6,380)
$34.00$0.06/serving
THORNE - Basic Prenatal - Well-Researched Folate Multi for Pregnant & Nursing Women - Includes 18 ViVitamins

THORNE - Basic Prenatal - Well-Researched Folate Multi for Pregnant & Nursing Women - Includes 18 Vi

NSF Certified for Sport, NSF GMP

- Basic Prenatal

Basic Prenatal — Well-Researched Folate Multi for Pregnant & Nursing Women - Includes 18 Vitamins & Minerals, Plus Choline - Third-Party Certified - G

4.3 (6,358)
$37.00$1.23/serving
THORNE - Basic B-Complex - Tissue-Ready Vitamin B Complex Supplement with Choline - Supports CellulaVitamins

THORNE - Basic B-Complex - Tissue-Ready Vitamin B Complex Supplement with Choline - Supports Cellula

NSF Certified for Sport, NSF GMP

- Basic B-Complex

Basic B-Complex — Tissue-Ready Vitamin B Complex Supplement with Choline - Supports Cellular Energy Production, Brain Health & Red Blood Cell Formatio

4.7 (4,298)
$27.00$0.45/serving
THORNE - Stress B-Complex - Vitamins B2, B6, B12 & Folate in Highly-Absorbable and Active Forms - ExVitamins

THORNE - Stress B-Complex - Vitamins B2, B6, B12 & Folate in Highly-Absorbable and Active Forms - Ex

NSF Certified for Sport, NSF GMP

- Stress B-Complex

Stress B-Complex — Vitamins B2, B6, B12 & Folate in Highly-Absorbable and Active Forms - Extra Vitamin B5 for Adrenal Support, Stress Management & Imm

4.6 (4,022)
$26.00$0.43/serving
THORNE - Advanced Iron Complex - Complete Blood Support Formula* - Elemental Iron, Folate, B and C V CapsuleVitaminsCapsule

THORNE - Advanced Iron Complex - Complete Blood Support Formula* - Elemental Iron, Folate, B and C V

NSF Certified for Sport, NSF GMP

- Advanced Iron Complex

Advanced Iron Complex — Complete Blood Support Formula* - Elemental Iron, Folate, B and C Vitamins for Optimal Absorption - Chelated Iron Supplement -

4.6 (3,945)
$26.00$0.43/serving
THORNE - B-Complex #12 - Vitamin B Complex with Choline Supplement - Supports Cellular Energy Produc CapsuleVitaminsCapsule

THORNE - B-Complex #12 - Vitamin B Complex with Choline Supplement - Supports Cellular Energy Produc

NSF Certified for Sport, NSF GMP

- B-Complex #12

B-Complex #12 — Vitamin B Complex with Choline Supplement - Supports Cellular Energy Production & a Healthy Nervous System* - Third-Party Certified -

4.7 (3,921)
$26.00$0.43/serving
THORNE - 5-MTHF - Methylfolate (Active B9 Folate) Supplement - Supports Cardiovascular Health, FetalVitamins

THORNE - 5-MTHF - Methylfolate (Active B9 Folate) Supplement - Supports Cardiovascular Health, Fetal

NSF Certified for Sport, NSF GMP

1mg · - 5-MTHF

5-MTHF — Methylfolate (Active B9 Folate) Supplement - Supports Cardiovascular Health, Fetal Development, Nerve Health, Methylation & Homocysteine Leve

4.7 (3,870)
$24.00$0.40/serving
THORNE - Vitamin D3 Supplement - Supports Healthy Bones, Teeth, Muscles, Cardiovascular & Immune FunVitamins

THORNE - Vitamin D3 Supplement - Supports Healthy Bones, Teeth, Muscles, Cardiovascular & Immune Fun

NSF Certified for Sport, NSF GMP

1,000 IU · - Vitamin D3 Supplement

Vitamin D3 Supplement — Supports Healthy Bones, Teeth, Muscles, Cardiovascular & Immune Function* - Gluten, Dairy & Soy-Free - 1,000 IU - 90 Servings

4.8 (3,539)
$17.00$0.19/serving
VitaminsCapsule

THORNE - Vitamin B12 - as Methylcobalamin - Supports Heart & Nerve Health, Blood Cell Function, Rest

NSF Certified for Sport, NSF GMP

- Vitamin B12

Vitamin B12 — as Methylcobalamin - Supports Heart & Nerve Health, Blood Cell Function, Restful Sleep & Methylation* - Third-Party Certified - Gluten,

4.8 (3,381)
$24.00$0.40/serving
THORNE - Vitamin C 500 mg - Blend of Vitamin C and Citrus Bioflavonoids from Oranges - Supports ImmuVitamins

THORNE - Vitamin C 500 mg - Blend of Vitamin C and Citrus Bioflavonoids from Oranges - Supports Immu

NSF Certified for Sport, NSF GMP

500 mg · - Vitamin C

Vitamin C 500 mg — Blend of Vitamin C and Citrus Bioflavonoids from Oranges - Supports Immune System, Cellular Energy Production & Collagen Production

4.8 (3,350)
$23.00$0.26/serving
THORNE - Vitamin D-10,000 - Vitamin D3 Supplement - Supports Healthy Bones, Teeth & Muscles, Plus Ca CapsuleVitaminsCapsule

THORNE - Vitamin D-10,000 - Vitamin D3 Supplement - Supports Healthy Bones, Teeth & Muscles, Plus Ca

NSF Certified for Sport, NSF GMP

- Vitamin D-10,000

Vitamin D-10,000 — Vitamin D3 Supplement - Supports Healthy Bones, Teeth & Muscles, Plus Cardiovascular & Immune Function* - Third-Party Certified - G

4.8 (2,674)
$24.76$0.41/serving
THORNE - Multi-Vitamin Elite - Daily Nutritional Supplement - Two Formulas Support Cellular Energy P CapsuleVitaminsCapsule

THORNE - Multi-Vitamin Elite - Daily Nutritional Supplement - Two Formulas Support Cellular Energy P

NSF Certified for Sport, NSF GMP

- Multi-Vitamin Elite

Multi-Vitamin Elite — Daily Nutritional Supplement - Two Formulas Support Cellular Energy Production, Restful Sleep & More* - Third-Party Certified -

4.6 (2,043)
$76.00$0.42/serving
THORNE - Niacinamide - Non-Flushing Form of Vitamin B3 - Supports Skin Health & Provides Cellular Pr CapsuleVitaminsCapsule

THORNE - Niacinamide - Non-Flushing Form of Vitamin B3 - Supports Skin Health & Provides Cellular Pr

NSF Certified for Sport, NSF GMP

- Niacinamide

Niacinamide — Non-Flushing Form of Vitamin B3 - Supports Skin Health & Provides Cellular Protection* - Niacin Supplement - Third-Party Certified - Glu

4.6 (1,985)
$25.67$0.14/serving
THORNE - Women's Multi 50+ - Comprehensive Daily Multi with Vitamins A, B6, B12, C, D, E, K, Zinc & CapsuleVitaminsCapsule

THORNE - Women's Multi 50+ - Comprehensive Daily Multi with Vitamins A, B6, B12, C, D, E, K, Zinc &

NSF Certified for Sport, NSF GMP

- Women's Multi 50+

Women's Multi 50+ — Comprehensive Daily Multi with Vitamins A, B6, B12, C, D, E, K, Zinc & More - Support Heart, Brain, Bone & Immune Health* - Third-

4.3 (1,824)
$56.00$0.31/serving
THORNE - Methyl-Guard Plus - Active Folate (5-MTHF) with Vitamins B2, B6 & B12 - Supports MethylatioVitamins

THORNE - Methyl-Guard Plus - Active Folate (5-MTHF) with Vitamins B2, B6 & B12 - Supports Methylatio

NSF Certified for Sport, NSF GMP

- Methyl-Guard Plus

Methyl-Guard Plus — Active Folate (5-MTHF) with Vitamins B2, B6 & B12 - Supports Methylation & Healthy Level of Homocysteine* - Gluten, Dairy & Soy-Fr

4.7 (1,721)
$62.00$2.07/serving
THORNE - Vitamin K - Vitamins K1 and K2 (as MK-4 and MK-7) Capsule Supplement - Supports Strong Bone CapsuleVitaminsCapsule

THORNE - Vitamin K - Vitamins K1 and K2 (as MK-4 and MK-7) Capsule Supplement - Supports Strong Bone

NSF Certified for Sport, NSF GMP

- Vitamin K

Vitamin K — Vitamins K1 and K2 (as MK-4 and MK-7) Capsule Supplement - Supports Strong Bones* - Clinically Studied Ingredients - Third-Party Certified

4.8 (1,628)
$31.00$0.52/serving
THORNE - Vitamin D Liquid - Vitamin D Supplement - Supports Healthy Bones and Muscles, Cardiovascula LiquidVitaminsLiquid

THORNE - Vitamin D Liquid - Vitamin D Supplement - Supports Healthy Bones and Muscles, Cardiovascula

NSF Certified for Sport, NSF GMP

- Vitamin D Liquid

Vitamin D Liquid — Vitamin D Supplement - Supports Healthy Bones and Muscles, Cardiovascular Health & Immune Function* - 1 Fl Oz (30 ml) - 600 Serving

4.5 (1,204)
$19.30$0.03/serving
THORNE - Biotin - Vitamin B7 Supplement for Healthy Hair, Nails, Skin & Metabolism - Supports Nerve CapsuleVitaminsCapsule

THORNE - Biotin - Vitamin B7 Supplement for Healthy Hair, Nails, Skin & Metabolism - Supports Nerve

NSF Certified for Sport, NSF GMP

- Biotin

Biotin — Vitamin B7 Supplement for Healthy Hair, Nails, Skin & Metabolism - Supports Nerve Health* - Third-Party Certified - Gluten, Dairy & Soy-Free

4.7 (1,136)
$28.00$0.47/serving
THORNE - B-Complex #6 - Vitamin B Complex with Active Forms of Essential B Vitamins & Extra B6-60 SeVitamins

THORNE - B-Complex #6 - Vitamin B Complex with Active Forms of Essential B Vitamins & Extra B6-60 Se

NSF Certified for Sport, NSF GMP

- B-Complex #6

B-Complex #6 — Vitamin B Complex with Active Forms of Essential B Vitamins & Extra B6-60 Servings

4.6 (1,117)
$25.60$0.43/serving
THORNE - Men's Multi 50+ - Comprehensive Daily Multi with Vitamins A, B6, B12, C, D, E, Zinc & More CapsuleVitaminsCapsule

THORNE - Men's Multi 50+ - Comprehensive Daily Multi with Vitamins A, B6, B12, C, D, E, Zinc & More

NSF Certified for Sport, NSF GMP

- Men's Multi 50+

Men's Multi 50+ — Comprehensive Daily Multi with Vitamins A, B6, B12, C, D, E, Zinc & More - Support Heart, Brain, Prostate, Muscle & Immune Health* -

4.5 (1,098)
$56.00$0.31/serving
THORNE - Thyroid Health Complex - Thyroid Cofactors for Thyroid Function Support* - Vitamins B12, C CapsuleVitaminsCapsule

THORNE - Thyroid Health Complex - Thyroid Cofactors for Thyroid Function Support* - Vitamins B12, C

NSF Certified for Sport, NSF GMP

- Thyroid Health Complex

Thyroid Health Complex — Thyroid Cofactors for Thyroid Function Support* - Vitamins B12, C & E, Ashwagandha, Iodine, Zinc, Selenium, Copper & L-Tyrosi

4.6 (1,074)
$40.00$0.33/serving
THORNE - 5-MTHF - Methylfolate (Active B9 Folate) Supplement - Supports Cardiovascular Health, FetalVitamins

THORNE - 5-MTHF - Methylfolate (Active B9 Folate) Supplement - Supports Cardiovascular Health, Fetal

NSF Certified for Sport, NSF GMP

5mg · - 5-MTHF

5-MTHF — Methylfolate (Active B9 Folate) Supplement - Supports Cardiovascular Health, Fetal Development, Nerve Health, Methylation & Homocysteine Leve

4.7 (1,029)
$68.00$1.13/serving
VitaminsCapsule

THORNE - 5-HTP - Contains Vitamin B6 - Serotonin Support for Sleep & Stress Management* - 5-Hydroxyt

NSF Certified for Sport, NSF GMP

- 5-HTP

5-HTP — Contains Vitamin B6 - Serotonin Support for Sleep & Stress Management* - 5-Hydroxytryptophan Supplement - Third-Party Certified - Gluten, Dair

4.6 (1,000)
$38.60$0.43/serving

Frequently Asked Questions

Is Thorne third-party tested?

Yes. Thorne manufactures all products in their own NSF GMP-registered facilities. Their athletic line carries NSF Certified for Sport designation, and all products undergo rigorous testing for identity, purity, potency, and composition.

Why do doctors recommend Thorne?

Thorne partners with Mayo Clinic and other research institutions to develop evidence-based formulations. Their commitment to third-party testing, allergen-free manufacturing, and clinical dosing makes them a preferred brand among healthcare practitioners.

Does Thorne use proprietary blends?

No. Thorne discloses every ingredient and its exact dose on all product labels. They also avoid common allergens, unnecessary binders, and artificial preservatives.

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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