A guy in my gym was telling that creatine is unstable in solution. Is it true?
Yes, it’s absolutely correct. Creatine is really unstable in solution. When creatine is kept in water or a some other liquid like a grape juice for a long time (8 to 9 hours), then creatine degrades into an another substance known as “creatinine”, which is a useless substance and has no effect on your body mass or muscles. So, I would advice you not leave creatine dissolved in water for longer periods of time.