Anti-DHT shampoos like Pura d'or Organic Argan Oil Based Hair Loss Prevention Therapy Shampoo, Regenepure and HairGenesis Anti-DHT Shampoo are made to block DHT, which causes hair loss. These shampoos are generally made with natural ingredients like saw palmetto, pumpkin seed oil and green tea extract, which is thought to help improve the health of the hair, the scalp and block DHT.
Someone looking for a DHT blocking shampoo will likely have to check with their local hair salon or look into ordering the products online. Most DHT blocking shampoos aren't carried by local stores and must be ordered online. Some of these shampoos need to be prescribed by a doctor.