TWIN PACK: Contains nutrients important for forming a healthy hair shaft. B vitamins for maintaining hair health and colour. Choline and Inositol are fat controlling factors, part of the hair's natural oils. Zinc is an essential part of several key enzymes in hair protein metabolism. Manganese and Copper are trace mineral essential for enzymes. Copper is also important for maintaining hair colour. Iron and Vit B12 are essential for the production of red blood cells. Kelp is a rich source of iodine, also necessary for healthy hair.