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Renal impairment reduces B12 excretion, leading to accumulation

A study published in the International Journal of Academic Medicine and Pharmacy had found the link between inadequate vitamin B12 levels and adverse health outcomes, including metabolic disorders and cardiovascular risk factors

What Research Really Shows | Explained TL;DR The honest answer is: maybe, a little, in some studies, mostly on sun-exposed skin, and the effect fades once you stop taking it

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5 Using easy-sounding scientific hacks like peptides to achieve desired effects can sound convincing to a young person

And weigh the regulatory reality unapproved status, jurisdictional variation, and WADA prohibition as part of any decision