Stronger hair & nails Added joint formula Beauty inside & OutMaximum absorption18 amino acids Great for Ligaments & tendons Collagen is our body's key structural protein, which is involved in creating strong and healthy hair, nails, bone, muscle and tendons. It also keeps our skin smooth and muscle lean for weight management. During our youth collagen helps prevent wrinkles from forming, gives skin elasticity, helps create strong and thicker hair. In our early 20's collage diminishes by about 1% per year. By the age of 30, the signs of collagen reduction have started to become visible. Decreased amounts in bones and joints begin to be felt. The reduction cycle will not reverse by itself. Replenishment becomes a necessity to slow the decline and address the issue. Youtheory's advanced formula contains Types 1,2 & 3 to help restore your hair, skin, nails, and joints.