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Have you ruled out your supply is contaminated with something that causes your side effects?

That might be relatively likely.

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Given creatine is present in several foods, do you have an intolerance to those as well as creatine in supplement form? Curious if it's a simple allergy or the dosage.
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Creatine breaks when cooked, so for the most part he's not gonna get too much from eating a steak or whatever. Taking 5g/day of pure creatine to satiate your stores might be too much for this particular individual. Anyway, the parent produces its own creatine as well!
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