Hair Darkening is a complete scientific process which includes your hormonal & overall health, good blood formation & circulation throughout the body, the diet you eat, the environmental factors, and your hair care routine. You have to take care of your Vitamin B12 and Vitamin D levels, along with Serum Ferritin and Serum calcium. The Premature Greying of hair treatment by Regena Roots helps you get your natural, dark hair back.