Keratin

amino acids

★★★★★

Keratin is a structural protein that forms the primary component of hair, skin, and nails. Supplemental keratin aims to support the health and appearance of these tissues, though bioavailability remains a key limitation.

Ready to try Keratin?

Shop top-rated Keratin supplements on Amazon UK

Buy on Amazon High Strength →

Affiliate link — we may earn a small commission at no extra cost to you.

Benefits

✓May improve hair strength and reduce breakage

✓Supports nail growth and resilience

✓Could enhance skin hydration and elasticity

✓May reduce hair loss and promote thicker hair growth

✓Supports the structural integrity of keratin-rich tissues

Dosage

Typical Dose

500–1000 mg daily

Upper Limit

2000 mg daily

Timing

With meals to enhance absorption

Forms & Bioavailability

Hydrolysed Keratin (Keratin Peptides)

High

Native Keratin Powder

Low

Keratin Capsules

Moderate

Side Effects

⚠Generally well-tolerated; mild digestive upset in sensitive individuals

⚠May cause temporary nausea or loss of appetite at high doses

Interactions

⚡No significant interactions with medications reported

⚡May have additive effects with biotin and collagen supplements

Research Summary

Evidence for oral keratin supplementation is limited and mixed. Some studies suggest hydrolysed keratin may improve hair and nail quality, though results are modest. More robust clinical trials are needed to establish efficacy and optimal dosing.

Compare Keratin with...

vs Vitamin D3 vs Magnesium vs Omega-3 (EPA/DHA)vs Creatine Monohydrate vs Ashwagandha (KSM-66)vs Zinc vs L-Theanine vs Vitamin B12 All comparisons →

The Bottom Line on Keratin

Keratin is moderately researched with promising but sometimes mixed evidence.It is most commonly used for may improve hair strength and reduce breakage and supports nail growth and resilience. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.

About Our Research

This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.

Top Rated Keratin on Amazon UK

We recommend choosing products with 4+ star ratings and verified reviews. Look for third-party tested brands.

Best Rated Keratin→High Strength Keratin→

Affiliate links — we earn a small commission at no extra cost to you.

Where to Buy Keratin

We recommend buying from reputable retailers. Check reviews and third-party testing.

Amazon UK →

Affiliate links — we may earn a commission at no extra cost to you.

Goal Guides for Keratin

See how Keratin can help with specific health goals:

Keratin for sleep Keratin for focus Keratin for energy Keratin for longevity Keratin for fat loss

Browse all goal guides →

Disclaimer: This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement, especially if you have existing health conditions or take medication.