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NIZORAL SHAMPOO Contact Us Nizoral is a potent anti-dandruff shampoo that also cleanses the scalp and prevents hair loss Nizoral, a potent anti-dandruff shampoo, also helps to block the conversion of testosterone to dihydrotestosterone (DHT). It is believed that DHT has a role in the hair follicle dying and falling out and indeed, Nizoral does appear to prevent hair loss.