Ultra Nourish-Hair by GNC Women's — Ingredients, Evidence & Safety

🟢 90/100

This product looks safe

Contains proprietary blend — exact ingredient amounts not disclosed
76% of ingredients have research evidence

A Label Compliance Grade

Product Label

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Safety Alerts

ℹ️ Contains proprietary blend — exact ingredient amounts not disclosed

Label Data

2 Caplet(s) Serving Size

60 Servings

Other Combinations Product Type

76% Evidence Coverage

Supplement Facts — Evidence Check

Vitamin A

1000 IU (20% DV)

Vitamin C

60 mg (100% DV)

Vitamin E

30 IU (100% DV)

✅ 1.3× RDA — within safe limits 📚 177 studies (Tier A: 3, B: 90)

RDA 15mg This product: 20.1mg UL 1000mg

Thiamine

1.5 mg (100% DV)

✅ 1.2× RDA — within safe limits 📚 76 studies (Tier A: 0, B: 33)

RDA 1.2mg This product: 1.5mg

Riboflavin

1.7 mg (100% DV)

✅ 1.3× RDA — within safe limits 📚 12 studies (Tier A: 0, B: 1)

RDA 1.3mg This product: 1.7mg

Niacin

20 mg (100% DV)

✅ 1.4× RDA — within safe limits 📚 193 studies (Tier A: 5, B: 63)

RDA 14mg This product: 20mg UL 35mg

Vitamin B6

4 mg (200% DV)

📊 3.1× RDA — above typical dose (UL: 100 mg) 📚 113 studies (Tier A: 3, B: 35)

RDA 1.3mg This product: 4mg UL 100mg

Folic Acid

200 mcg (50% DV)

✅ Within RDA (0.5× RDA of 0.4 mg) 📚 225 studies (Tier A: 10, B: 105)

RDA 0.4mg This product: 0.2mg UL 1.0mg

Vitamin B12

6 mcg (100% DV)

✅ 2.5× RDA — within safe limits 📚 138 studies (Tier A: 1, B: 44)

RDA 0.0024mg This product: 0.006mg

Biotin

1200 mcg (400% DV)

📊 40.0× RDA — above typical dose 📚 26 studies (Tier A: 0, B: 11)

RDA 0.03mg This product: 1.2mg

Pantothenic Acid

20 mg (200% DV)

📊 4.0× RDA — above typical dose 📚 1 studies — no high-quality reviews

RDA 5mg This product: 20mg

Iodine

50 mcg (33% DV)

✅ Within RDA (0.3× RDA of 0.15 mg) 📚 243 studies (Tier A: 4, B: 133)

RDA 0.15mg This product: 0.05mg UL 1.1mg

Magnesium

40 mg (10% DV)

📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)

This product: 40mg

Zinc

30 mg (200% DV)

✅ 2.7× RDA — within safe limits 📚 258 studies (Tier A: 6, B: 134)

RDA 11mg This product: 30mg UL 40mg

Copper

2 mg (100% DV)

✅ 2.2× RDA — within safe limits 📚 36 studies (Tier A: 0, B: 11)

RDA 0.9mg This product: 2mg UL 10mg

Proprietary Amino Acid Complex

800 mg

📊 Market median: 500.0mg (180 products) 📚 5 studies (Tier A: 0, B: 1)

This product: 800mg

MSM

500 mg

📊 Market median: 1000.0mg (2 products)

This product: 500mg

Choline

250 mcg

📊 Market median: 125.0mg (294 products) 📚 36 studies (Tier A: 1, B: 7)

RDA 550mg This product: 0.25mg UL 3500mg

Boron

3 mg

📊 Market median: 3.0mg (58 products) 📚 2 studies — no high-quality reviews

This product: 3mg UL 20mg

Silica

1 mg

📊 Market median: 108.0mg (8 products) 📚 9 studies (Tier A: 0, B: 4)

This product: 1mg

Inositol

50 mcg

📊 Market median: 550.0mg (217 products) 📚 29 studies (Tier A: 0, B: 5)

This product: 0.05mg

Other Ingredients

Cellulose Titanium Dioxide Vegetable Acetoglycerides

Label Claims — Verification

❓ Nutrient

❓ All Other

❓ Structure/Function

All Other (99% of products) Structure/Function (76% of products) Nutrient (58% of products)

Target Groups

Adult Female (18 - 50 Years) Gluten Free Sugar Free

Product Information

📋 Directions for Use

Directions: As a dietary supplement, take two caplets daily.

⚠️ Warnings & Precautions

Contains: Milk.

KEEP OUT OF REACH OF CHILDREN.

🧪 Formulation Notes

- Biotin - Supports the matrix of hair and normal cell growth. Each serving combines 1200 mcg of biotin with silica to provide support for healthy hair. - MSM (Methysulfonyl-methane) - A natural source of sulfur that is an essential component of collagen, a specific type of protein found in hair. - Amino acid complex - Amino acids are the building blocks of proteins that are needed for growth and repair of tissues.

- 1200 mcg biotin - 500 mg MSM - 800 mg proprietary amino acid complex

Contains: Milk.

No Sugar, No Starch, No Artificial Colors, No Artificial Flavors, No Preservatives, No Wheat, No Gluten, No Corn, Yeast Free.

Additional Information

{caplet} actual size

GNC, the leader in the development and manufacture of dietary supplements, is committed to producing the highest quality products available. This commitment begins with quality designed supplement formulations. Every raw material that goes into a GNC supplement is guaranteed as to quality and potency. Each product is dated and then shipped immediately to our stores, so you can be sure you are purchasing the freshest supplements available. At GNC, we extend our quality commitment to you by offering our money-back guarantee.

GNC GUARANTEE Use any GNC supplement for as little as 10 days. If you are not 100% completely satisfied, return the unused portion of the product with proof of purchase to your GNC store for a complete refund of your purchase price. No questions asked!

- Antioxidant protection - Provides antioxidant nutrients that protect the body from harmful free radicals that promote the cell-aging process.

Advanced nutrition for beautiful hair

GNC Women's Ultra Nourish-Hair is specially formulated to help nourish your hair from within. This enhanced formulas blends amino acids with important nutrients found in the matrix of hair.

CODE 299621 JHG

Potencies verified by GNC procedure #5015. Conforms to USP <2091> for weight. Meets USP <2040> disintegration.

Store in a cool, dry place.

Product Details

DSLD Entry Date 2016-03-24

Product Type Other Combinations

Form Other (e.g. tea bag)

Brand GNC Women's

DSLD ID 57160

Data Updated 2026-04-11

Research Evidence

337 Research Sources

54 Avg Quality Score

161 Meta Analysis

68 Systematic Review

51 Rct

48 Clinical Trial

2 Other

2 Regulatory Source

1 Narrative Review

1 Cochrane Review

1 Guideline

1 Openfda Safety

A Vitamin A supplementation for preventing morbidity and mortality in children from six months to five years of age

Meta Analysis The Cochrane database of systematic reviews 2017

PubMed DOI Cochrane

A Vitamin A supplementation for the prevention of morbidity and mortality in infants six months of age or less

Meta Analysis The Cochrane database of systematic reviews 2011

PubMed DOI Cochrane

A Vitamin A supplementation for reducing the risk of mother-to-child transmission of HIV infection

Meta Analysis The Cochrane database of systematic reviews 2011

PubMed DOI Cochrane

A Vitamin A supplements for preventing mortality, illness, and blindness in children aged under 5: systematic review and meta-analysis

Meta Analysis BMJ (Clinical research ed.) 2011

PubMed DOI

A Fortification of staple foods with vitamin A for vitamin A deficiency

Systematic Review The Cochrane database of systematic reviews 2019

PubMed DOI Cochrane

A Vitamin A supplementation for the prevention of morbidity and mortality in infants one to six months of age

Narrative Review The Cochrane database of systematic reviews 2016

PubMed DOI Cochrane

A Vitamin A and fish oils for preventing the progression of retinitis pigmentosa

Meta Analysis The Cochrane database of systematic reviews 2020

PubMed DOI

A Exercise training-induced changes in exerkine concentrations may be relevant to the metabolic control of type 2 diabetes mellitus patients: A systematic review and meta-analysis of randomized controlled trials

Meta Analysis Journal of sport and health science 2023

PubMed DOI

A Food fortification with multiple micronutrients: impact on health outcomes in general population

Meta Analysis The Cochrane database of systematic reviews 2019

PubMed DOI

A Oral vitamin A supplements to prevent acute upper respiratory tract infections in children up to seven years of age

Meta Analysis The Cochrane database of systematic reviews 2024

PubMed DOI

View all evidence for Vitamin A →