The primary function of collagen is to help tissues withstand stretching. Although collagen loss starts between the ages of 18 and 29, after age 40, the body can lose around 1% per year; at around age 80, collagen production can decrease 75% overall in comparison to that of young adults.1 This is where supplements come in. By taking a supplement, you can replenish some of the collagen your body has lost, and hopefully, see the real effects of adding this supplement to your diet.