Powered by a potent blend of amino acids, vitamins and minerals, the Philip Kingsley Density Amino Acid Protein Booster Supplement is designed to support the appearance of healthier-looking hair. n Designed to complement a varied diet, each capsule contains a mix of essential and non-essential amino acids, including lysine, leucine and cysteine, combined with biotin, selenium and vitamin C. The nutrient-rich formula fits easily into your daily wellness routine; simply take two capsules twice a day.