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[DOI] [PubMed] [Google Scholar] 242.Wadden TA, Foreyt JP, Foster GD, et al

So, what are B12 shots

B-complex injections combine several B vitamins that support adrenal function, metabolism, mood, and cellular energy

Multicenter, placebo-controlled trial of lorcaserin for weight management

A peptide is a chain of amino acids held together by peptide bonds, and those bonds are precisely what digestive enzymes (pepsin, trypsin) are built to cut, with the acidic stomach environment finishing the job so an oral peptide is largely destroyed before it can be absorbed, which is why injection is the default

These are very effective at raising blood levels of B12 and preventing/reversing a deficiency