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Keratin Formula

product on market Capsule Nature's Bounty Optimal Solutions Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 67% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · methodology

This formula contains B vitamins and zinc, which are essential for keratin production and hair health. Research provides moderate evidence that biotin and zinc support nail and hair integrity. However, overall evidence coverage for this specific ingredient combination is limited.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for Keratin Formula
Open Full PDF View on NIH DSLD →
Details

Label Data

2 Capsule(s)
Serving Size
25
Servings
Other Combinations
Product Type
67%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

18 mg (90% DV)
1.3× RDA — within safe limits 196 studies (A:5, B:63)
2 mg (100% DV)
1.5× RDA — within safe limits 114 studies (A:3, B:35)
300 mcg (100% DV)
10.0× RDA — above typical dose 27 studies (A:0, B:11)
14 mg (140% DV)
2.8× RDA — within safe limits 2 studies — no high-quality reviews
15 mg (100% DV)
1.4× RDA — within safe limits 263 studies (A:6, B:134)
2 mg (100% DV)
2.2× RDA — within safe limits 37 studies (A:0, B:11)
Cynatine HNS Keratin
500 mg
10 mg
Market median: 167.0mg (311 products) 183 studies (A:0, B:65)
Grapeseed extract
10 mg

Other Ingredients

Gelatin Dicalcium Phosphate Contains Less Than 2% of
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

DIRECTIONS: For adults, take two (2) capsules daily, preferably with a meal.

Warnings & Precautions

Do not use if seal under cap is broken or missing.

WARNING: If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use.

Discontinue use and consult your doctor if any adverse reactions occur.

Not intended for use by persons under the age of 18. Keep out of reach of children.

Formulation Notes

with Resveratrol & Grape Seed

No Artificial Flavor or Sweetener, No Preservatives, No Sugar, No Starch, No Milk, No Lactose, No Soy, No Gluten, No Wheat, No Yeast, No Fish. Sodium Free.

Additional Information

Store at room temperature.

LABORATORY TESTED GUARANTEED QUALITY

Laboratory tested to meet strict quality control standards for potency, purity and disintegration. 100% Quality Guaranteed.

Nutrition Questions or Comments? Call 1-800-433-2990 Mon. - Sat. 9 AM - 7 PM ET

HEALTHY AGING

Supports Skin Elasticity & Hydration, and Hair Strength*

Prod. No. 55274 00A B54966 EA4

Metadata

Product Details

DSLD Entry Date2015-08-25
Product TypeOther Combinations
FormCapsule
BrandNature's Bounty Optimal Solutions
DSLD ID49568
Data Updated2026-04-11
Research

Research Evidence

241
Research Sources
55
Avg Quality
113
Meta Analysis
75
Systematic Review
32
Rct
11
Clinical Trial
3
Other
3
Regulatory Source
1
Cochrane Review
1
Narrative Review
1
Openfda Safety
A Niacin for primary and secondary prevention of cardiovascular events
Meta Analysis The Cochrane database of systematic reviews 2017 PubMed DOI
A Use of high potency statins and rates of admission for acute kidney injury: multicenter, retrospective observational analysis of administrative databases
Meta Analysis BMJ (Clinical research ed.) 2013 PubMed DOI
A Effect on cardiovascular risk of high density lipoprotein targeted drug treatments niacin, fibrates, and CETP inhibitors: meta-analysis of randomised controlled trials including 117,411 patients
Meta Analysis BMJ (Clinical research ed.) 2014 PubMed DOI
A A terminal metabolite of niacin promotes vascular inflammation and contributes to cardiovascular disease risk
Meta Analysis Nature medicine 2024 PubMed DOI
A Meta-analysis and imputation refines the association of 15q25 with smoking quantity
Meta Analysis Nature genetics 2010 PubMed DOI
A Genome-wide meta-analyses identify multiple loci associated with smoking behavior
Meta Analysis Nature genetics 2010 PubMed DOI
A Antidepressants for smoking cessation
Meta Analysis The Cochrane database of systematic reviews 2014 PubMed DOI
A Topical azelaic acid, salicylic acid, nicotinamide, sulphur, zinc and fruit acid (alpha-hydroxy acid) for acne
Meta Analysis The Cochrane database of systematic reviews 2020 PubMed DOI
B Assessment of the Role of Niacin in Managing Cardiovascular Disease Outcomes: A Systematic Review and Meta-analysis
Meta Analysis JAMA network open 2019 PubMed DOI
B Association Between Lowering LDL-C and Cardiovascular Risk Reduction Among Different Therapeutic Interventions: A Systematic Review and Meta-analysis
Meta Analysis JAMA 2016 PubMed DOI
View all evidence for Niacin →
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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.