I was taking collagen in my coffee every morning. I loved it. I noticed my hair was growing very fast, my nails looked really good and my joints were feeling great. About three months in, I developed bone pain and my ankles felt like they were going to give out. Since I take no medicine or supplements, I researched the side effects of collagen and sure enough joint pain was one of them. I reluctantly stopped taking the collagen and the side effects all went away. Disappointing because I liked the benefits. Just beware!!!