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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

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

the typical width and length of the TEMPO-CNFs were 34 nm and 0.11 m, respectively, according to the manufacturer's brochure