Used by Japanese court ladies since the Heian period, rice water is rich in vitamins B and E, inositol, amino acids, and antioxidants—believed to strengthen hair, improve elasticity, and promote shine.

Dermatologists warn that scientific proof for hair growth is limited—and excess starch can cause dryness or irritation, especially for coily or sensitive scalps.

If you choose to try it: Soak or rinse rice to produce water; optionally ferment for 3–5 days (fermentation boosts inositol, breaks down proteins, lowers pH for a healthier cuticle). Use as a final rinse once a week to start. If your hair becomes dry or stiff, reduce frequency.