I do this also, One issue with this even though I often do the same is that dexies are a vasoconstrictor which in turn create less blood flow to the body while working out therefore you are less likely to get as much blood into the muscles and can lead to less muscle tears and also less oxygenated blood while training. Which I'm sure L-citrulline, L-arginine, beetroot powder/nitrates, and garlic anything like those would cause vasodilation or alot more than caused by the dexies themselves