Why hair thins

Hair thinning can be linked to genetics, age, hormones, stress, diet and some medical conditions. A doctor or dermatologist can help find the cause, especially when shedding is sudden.

Common ingredients

Products for thinning hair often contain ketoconazole, biotin, caffeine, saw palmetto, rosemary oil or peptides. Each is claimed to support the scalp or hair in a different way, and the evidence varies by ingredient.

Shampoo versus treatments

A shampoo stays on the scalp for a short time, so it is usually one part of a routine. Leave-on treatments, supplements or medical options are separate products with their own considerations.

Choosing on a budget

Price does not always track quality. Compare the ingredient list, the size of the bottle and how often it is used, and look for sulfate-free formulas if your scalp is sensitive.

What to expect

Hair grows slowly, so changes in thickness or shedding usually take a few months of consistent use to judge. Stop using a product that irritates the scalp.