Difference Between Creatines

[SecondBest]

Does anyone know the difference between Monohydrate (which seems to be popular in the US, and in most Supps Stores) and Creatine Biphosphate (a British make it seems). I have a friend from Hungry saying the bio is way more affective. what do you think, or does anyone the exact difference, and what would you use?

 

[vendela99]

I'd also like to know how Magnesium Creatine Chelate compares to monohydrate and ethyl ester, and whether or not it causes water retention.