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Why is TB-500 banned in sport but BPC-157 is not named

References References Selective and membranepermeable small molecule inhibitors of NNMT Roles of Nicotinamide NMethyltransferase in Obesity and Type 2 Diabetes Nicotinamide Nmethyltransferase inhibition mimics and boosts exercisemediated improvements in muscle function in aged mice Reduced calorie diet combined with NNMT inhibition establishes a healthier gut microbiome in obese mice Kraus et al

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And some medical professionals even endorse them

There is a very short study on Methionine restriction involving a small sample size of human patients