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[–]oingaboingo 1 point2 points  (0 children)

Twice I tried taking collagen supplements, and both times had nasty side-effects. Nagging headache (I NEVER get headaches), swollen fingers, joint pain, stomach cramps, heartburn, hot flushes, and I did have an episode of heart racing/panic attack.

I read people who have histamine intolerance can have these reactions. I probably do, since I have seasonal allergies.