Shoppers are heaping praise on a collagen supplement they've dubbed the "holy grail." According to fans, the product helped their skin and hair, as well as eased joint pain. Supplements aim to boost what our bodies do not produce enough of - from certain hormones to vitamins and minerals that usually come from food. The body's natural collagen production starts to decline from around the age of 25, which means many people are looking for ways to add collagen into their day-to-day routine. The