Keratin Formula

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

This product looks safe

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

Product Label

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Label Data

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

Supplement Facts — Evidence Check

18 mg (90% DV)
✅ 1.3× RDA — within safe limits 📚 193 studies (Tier A: 5, B: 63)
RDA 14mg This product: 18mg UL 35mg
2 mg (100% DV)
✅ 1.5× RDA — within safe limits 📚 113 studies (Tier A: 3, B: 35)
RDA 1.3mg This product: 2mg UL 100mg
300 mcg (100% DV)
📊 10.0× RDA — above typical dose 📚 26 studies (Tier A: 0, B: 11)
RDA 0.03mg This product: 0.3mg
14 mg (140% DV)
✅ 2.8× RDA — within safe limits 📚 1 studies — no high-quality reviews
RDA 5mg This product: 14mg
15 mg (100% DV)
✅ 1.4× RDA — within safe limits 📚 258 studies (Tier A: 6, B: 134)
RDA 11mg This product: 15mg UL 40mg
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
Cynatine HNS Keratin
500 mg
10 mg
📊 Market median: 167.0mg (311 products) 📚 182 studies (Tier A: 0, B: 65)
This product: 10mg
Grapeseed extract
10 mg

Other Ingredients

Gelatin Dicalcium Phosphate Contains Less Than 2% of

Label Claims — Verification

❓ All Other
❓ Structure/Function
All Other (97% of products) Structure/Function (86% of products) Nutrient (36% of products)

Target Groups

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

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

Product Details

DSLD Entry Date 2015-08-25
Product Type Other Combinations
Form Capsule
Brand Nature's Bounty Optimal Solutions
DSLD ID 49568
Data Updated 2026-04-11

Research Evidence

241 Research Sources
55 Avg Quality Score
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 Cochrane
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 Cochrane
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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