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As discussed in Bioprocess Design, a CO 2 -bicarbonate system can be achieved by exogenous addition of 5-10% gaseous CO 2 (often delivered in bioreactor systems via sparging), which reaches equilibrium in solution with bicarbonate ions, forming a natural buffer system

PLOS Computational Biology 20:e1012276

This form of B12 interacts with an enzyme called methylmalonyl CoA mutase, a metabolic enzyme, and may be useful for those with impaired energy production

If your definition is based on calories, than creatine does break a fast, in which case, you also shouldn't drink coffee, but if it's based on whether it triggers an insulin response or raises blood sugar, then the answer is probably not