Many of you know how important I believe a smoothie with protein is to help increase vegetables and fruit while decreasing animal protein intake. Many of you have asked me to review and make a post. Well, here it is. I didn’t see a study saying specificly collage protein causes cancer. But type I collagen found these powders supports cancer tumor development and influence the growth, recurrence, and resistance to cancer treatment. Collagen Protein Powders and Most Collagen Supplements are Cancer