Here is a quote something that I read from one of my favorite authors, that might be relevent to ur question raven.
Quote:
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The most common argument against creatine supplementation is that it has a low bioavailability. First, it is argued that creatine is unstable in solution, and particularly in acid, so only a small amount survives the gastrointestinal tract. This isn't true - "unstable" is a relative term, and the degradation half-life (the time it takes for 50% of the creatine to degrade) in the GI tract can still be expected to be in the range of a week to a few months. The authors of what is perhaps the most extensive review of the pharmacokinetics of creatine to date estimate that about 2% of a 5 gram dose would be converted to creatinine (the inactive creatine byproduct) in one hour in the conditions of the GI tract, so "the conversion of creatine to creatinine in the GI tract is probably minimal regardless of transit time" [1].
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