The concept of ingesting collagen supplements  to promote firmer, youthful skin originates from Japan and its now catching the attention of celebrities and beauty editors in the US and Europe. No wonder collagen supplements that promise beautiful, youthful skin are now the fastest growing anti-aging product category. As a result, there are many collagen brands and types to choose from-- but not all collagen beauty supplements are created equal. Here are 7 tips for buying the best quality, most effective collagen beauty supplement that will benefit your skin, and help visibly reduce fine lines and wrinkles. TYPE OF COLLAGEN There...