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A tonic inhibitor that promotes hair regrowth. By focusing on the underlying factors and mechanisms that cause hair thinning or baldness, inhibitors can stop hair loss. One of the main factors contributing to hair loss in both sexes is the hormone dihydrotestosterone (DHT). A testosterone derivative, DHT can attach itself to hair follicles and cause them to contract, resulting in the production of ever finer and thinner hair until they eventually stop growing hair at all. This process is slowed down by inhibitors like finasteride and dutasteride, which lower the amount of DHT in the scalp.