Histemo ION-TO G Hair TonicION TO G Hair Tonic Hair loss can be distressing. That is why Histemo has created a serum that helps stimulate hair growth and is clinically proven to work. The scalp serum for hair growth is applied topically and works by inhibiting the synthesis of DHT. In addition, it stimulates your scalp by increasing the synthesis of elastin and collagen which prevent inflammation due to tissue damage. It is the best scalp serum for the prevention of hair loss