Ingredient library
What is actually in hair-growth products
Regulated actives, cosmetic complexes, botanicals and supplement ingredients — described plainly, with the level of evidence stated.
Minoxidil
The best-studied over-the-counter ingredient for hereditary hair loss, available as a 2% or 5% liquid or foam.
Cosmetic ingredientCaffeine
A popular shampoo and tonic ingredient studied for its effect on hair follicles in the lab.
Supplement ingredientBiotin
A B-vitamin found in most hair supplements. It helps if you're deficient, which is uncommon.
BotanicalSaw palmetto
A palm-berry extract sometimes described as a natural DHT blocker; evidence for hair is limited.
Antifungal drug activeKetoconazole
An antifungal shampoo for dandruff that's often added to hair-loss routines.
BotanicalRosemary oil
A trending natural oil; one small study compared it with minoxidil 2%.
BotanicalPumpkin seed oil
A seed oil studied in one small trial for male pattern hair loss.
Cosmetic ingredientPeptides
Short protein chains in many hair serums, meant to support the look of stronger hair.
Cosmetic ingredientNiacinamide
A calming vitamin used in scalp serums to support a healthy-feeling scalp.
NutrientIron
Low iron is a common, fixable cause of shedding — especially in women.
NutrientVitamin D
Low vitamin D is linked with several types of hair loss.
NutrientZinc
A mineral for hair growth inside the body, and a dandruff fighter in shampoo.
Supplement ingredientCollagen
A popular protein supplement; direct evidence for hair growth is lacking.
Supplement ingredientMarine protein complex
A fish-derived protein blend in some hair supplements.
Cosmetic / OTC activeSalicylic acid
An exfoliant that loosens flakes and buildup on the scalp.
BotanicalTea tree oil
A plant oil with antifungal properties used for mild dandruff.
FOLIGAIN® technologyTRIOXIDIL®
A FOLIGAIN® cosmetic ingredient complex formulated to support the appearance of thicker, fuller-looking hair.
Emerging ingredient2dDR
A naturally occurring sugar that has attracted research interest in hair and scalp science.
This content is for educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease. Speak with a qualified healthcare professional about your individual situation.