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There are a lot of steps, starting with L-tryptophan in the gut, which gets converted down a pathway in the liver and kidneys, ultimately being transformed by gram-negative bacteria in the urine
reusing a needle increases both contamination risk and the chance of a dulled tip damaging the vial stopper on subsequent insertions
doi: Kwon DR, Park GY
Isoleucine: Research shows that isoleucine aids in detoxification, immune function and hormone excretion
Begley CG
If you ever reacted to B12 shots, the cause was likely not the B12, but some excipient in the mix
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