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Data Collection Process Data were extracted from each study according to pre-agreed study outcomes

Most people get enough from diet, but older adults, vegans, and those with certain medical conditions may require supplementation

Unless advertised, most peptides are for research use only

Many medical weight loss programs use both together because they target different aspects of weight management

Patients seeking B12 testing or treatment should consult their GP, who can arrange appropriate blood tests (serum B12, full blood count, folate, and if indicated, intrinsic factor and parietal cell antibodies) and prescribe treatment if deficiency is confirmed

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