What is DHT Blocking Hair Growth Shampoo Our DHT blocking shampoo is formulated with saw palmetto - a proven DHT blocker that can reduce levels of the hormone in the scalp. The shampoo also contains caffeine, argan oil, iron and vitamin B3. DHT dihydrotestosterone is a male hormone that is a by-product of testosterone - in men that are sensitive to it, DHT binds to your hair follicles, leading to hair shrinkage and eventual hair loss.
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