DHT Blocking 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 argan oil, iron and vitamin B3. Men with mild hair loss that are experiencing the early signs of a receding hairline and hair loss in the crown area. If you are a 2 on the Norwood Scale, this is the plan for you. Sons Shampoo is suitable for men of all ages. Gently massage a good amount of the shampoo into your scalp for 30-60 seconds then leave in your hair for 60-90 seconds before rinsing. We recommend using warm rather than hot water to shower to help prevent your hair and scalp from becoming dry and damaged. Consistency is key. Keep up your routine to see the best results. Benefits HT-blocking Caffeine, argan oil, iron and vitamin B3 support healthy hair