Keratin
Also known as: Keratin protein, Cystine-rich protein
Effective Dosage
No established dose
✓ What the Science Says
Keratin is a structural protein that plays a crucial role in the health of hair, skin, and nails. Evidence from multiple systematic reviews and clinical trials suggests that keratin supplementation can improve hair strength and reduce hair loss.
✗ What It Doesn't Do
Keratin does not promote hair growth in individuals with no underlying deficiencies, nor does it act as a miracle cure for baldness. Claims that keratin can significantly enhance skin elasticity or reduce wrinkles are also not well-supported by scientific evidence.
Evidence-Based Benefits
Keratin is a structural protein that plays a crucial role in the health of hair, skin, and nails. Evidence from multiple systematic reviews and clinical trials suggests that keratin supplementation can improve hair strength and reduce hair loss.
Strong EvidenceEffective at: No established dose
Source: auto-research
Absorption & Bioavailability
Moderate - Keratin is a protein that may be broken down into amino acids during digestion, which can affect its direct benefits.
Red Flags to Watch For
- 🚩 Beware of products claiming instant results or miraculous transformations.
- 🚩 Avoid supplements that do not specify the source or quality of keratin used.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-03-07