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Collagen Supplement Side Effects
Question: Are there side effects from collagen supplements?
Answer: Collagen supplements containing collagen hydrolysate, collagen peptides and similar ingredients appear to be generally safe and well-tolerated. However, some people may experience mild side effects, ranging from gastrointestinal symptoms to skin rashes. Rarely, liver abnormalities have been reported, and people who are allergic to certain sources of collagen, such as fish, or who are allergic to sulfites, should not take collagen products containing these ingredients. For more information, see the "Safety and side effects sections" of our CL Answers about using collagen supplements for reducing joint pain or improving aging skin.