Vitamin D3 recent studies show link between vit d3 deficiency and hair loss. l-cysteine an amino acid essential to promote hair growth. it improves hair quality and texture, l-cysteine account for as much as 25% of the total amino acids in keratin which is the main component of hair follicle. l-methionine is an essential amino acid that helps against premature hair loss. it also improves hair texture, quality and growth. present in keratin and it is absolutely necessary for production of cysteine. silica this mineral helps to strengthen ‏your blood vessels and improve circulation which can stimulate the blood flow to your scalp and encourage hair growth. it also is a necessary component of your skin's connective tissues as well as collagen and helps to strengthen nails and hair. iron and zinc iron is responsible for the transmitting oxygen to your hair follicles. it also helps your body use protein to grow and build strong hair. zinc aids the body in repairing and growing hair and it keeps the ‏oil glands of the hair working properly. vitamin c vitamin c is used in the body to build collagen, which is essential for producing new hair cells. if you are deficient in vitamin c it can cause the hair to become weak and prone to breakage. biotin renews the follicles and roots of the hairs resulting in healthy & strong hair. zinc, copper and selenium getting rid of free radicals that can damage cells and dna.