Using CBD Hair Growth Leave In Serum for hair loss is effective because when used on hair follicles it delivers nutrients right to the source, which can decrease harmful toxins and stimulate hair growth. Wash your hair and apply to towel dried hair. Drop into the hairline that is affected and massage it for 1-3 minutes. Hair loss can be caused by high levels of cortisol in the body that comes from stress in our lives. For better results combined the other Care By Design Health and Wellness Hair Products into your routine. CBD Hair Growth Shampoo + Anagain and CBD Conditioner.