Hair guide › Hair-Loss Ingredient Evidence Ratings

Hair-Loss Ingredient Evidence Ratings

From rosemary oil to caffeine and saw palmetto — popular ingredients and home remedies, each rated by the actual strength of the evidence.

Last updated: 2026-06-14
Evidence: Moderate
Rosemary oil for hair loss →Evidence: Moderate
Ketoconazole shampoo for hair loss →Evidence: Limited
Saw palmetto for hair loss →Evidence: Limited
Caffeine for hair loss →Evidence: Limited
Pumpkin seed oil for hair loss →Evidence: Limited
Onion juice for hair loss →Evidence: Limited
Peppermint oil for hair loss →Evidence: Limited
Vitamin D for hair loss →Evidence: Insufficient
Zinc for hair loss →Evidence: Insufficient
Collagen for hair loss →Evidence: Insufficient
Green tea for hair loss →Evidence: Insufficient
Castor oil for hair loss →Evidence: Insufficient
Rice water for hair loss →Evidence: Insufficient
Does aloe vera help with hair loss? →Evidence: Limited
Does fenugreek (methi) help with hair loss? →Evidence: Insufficient
Does coconut oil help with hair loss? →Evidence: Insufficient
Does argan oil help with hair loss? →Evidence: Limited
Does black seed oil (Nigella sativa) help with hair loss? →Evidence: Limited
Does ginseng help with hair loss? →Evidence: Insufficient
Does apple cider vinegar help with hair loss? →Evidence: Insufficient
Niacin (vitamin B3) for hair loss →Evidence: Limited
Omega-3 (fish oil) for hair loss →Evidence: Insufficient
Does selenium help with hair loss? →Evidence: Insufficient
Biotin shampoo for hair loss →Evidence: Limited
Does amla (Indian gooseberry) help with hair loss? →
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Not medical advice. General education only; it does not replace diagnosis or treatment by a licensed professional. Consult a board-certified dermatologist before starting, stopping or changing any treatment.

⚠️ When to see a doctor — don’t self-treat

  • Sudden patchy or circular bald spots
  • Redness, scaling, pus, pain or itch (possible scarring alopecia — treat urgently)
  • Broken hairs or rapid loss
  • Loss with body-wide signs (weight loss, fatigue, cycle changes, acne, extra hair)
  • Loss right after a new medication
  • Any hair loss in a child
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