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Theyre not interchangeable

According to the National Academies of Sciences, Engineering, and Medicine (NAP), a safe highest level is called the tolerable upper intake level. Assessment of what amount is too much is based on animal and human studies, published evidence of adverse events, and professional agreement based on a committee of experts

For example, researchers have tested BPC-157 enemas as a treatment for ulcerative colitis in a pair of clinical trials conducted by the Croatian pharmaceutical company PLIVA in the 2000s

Alternatively, MDH activity was followed in a spectroscopic assay which monitors the formation of NADH (Figure 10A)