What is the recommended dosage for Keratin?

General: 250-500 mg/day solubilized keratin

What are the side effects of Keratin?

Potential side effects include: Generally well-tolerated, Rare gastrointestinal discomfort.

What is keratin and how may it support skin and hair health?

Keratin is the primary structural protein in skin, hair, and nails. Solubilized keratin supplements (Cynatine HNS) have been studied in clinical trials showing improvements in hair strength, nail appearance, and skin smoothness. Keratin provides bioavailable amino acids including cysteine, essential for disulfide bonds in skin and hair.

What dosage of keratin has been studied for skin and hair benefits?

Clinical trials have used 500 mg of solubilized keratin (Cynatine HNS) per day for 90 days. Studies measured outcomes including skin moisture, elasticity, hair strength, and nail appearance. The evidence base is smaller compared to collagen peptides, with fewer independent RCTs available.

What are the potential side effects of keratin supplements?

Oral keratin supplements are generally well tolerated. Mild gastrointestinal discomfort has been reported. Individuals with allergies to wool or feathers should exercise caution, as some keratin supplements are derived from these sources. Formaldehyde, which is a concern in topical keratin hair treatments, is not present in oral supplements.

Keratin

collagen_protein

Also known as: Cynatine HNS, Solubilized Keratin, Keratin Peptides

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About

Keratin is a structural protein providing mechanical strength to hair, skin, and nails. Solubilized keratin supplements provide cysteine-rich peptides that may support endogenous keratin synthesis. A 90-day RCT found 500 mg/day of solubilized keratin improved skin moisture and elasticity, though the evidence base is limited.

How It Works

Structural protein providing mechanical strength to hair, skin, and nails; solubilized keratin supplements provide cysteine-rich peptides that may support endogenous keratin synthesis and disulfide bond formation in epidermal cells.

Evidence For Conditions

Condition	Grade	Studies	Participants
Hair, Skin & Nails Health	D	2	120	View →

Side Effects

Generally well-tolerated
Rare gastrointestinal discomfort

Drug & Supplement Interactions

No significant drug interactions documented

Always inform your healthcare provider about all supplements you take.

Related Ingredients

Collagen Peptides Elastin Hyaluronic Acid

Quick Facts

Dosage: General: 250-500 mg/day solubilized keratin
Forms: capsule tablet
Natural Sources: Meat, Eggs, Fish, Dairy, Legumes (provide amino acid precursors)
Upper Limit: Not established
Best Time: With meals

Evidence Summary

Hair, Skin & Nails Health D

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.