Doctors, like primary care physicians, endocrinologists, or obesity specialists, can prescribe them, as can nurse practitioners and physician assistants working under proper supervision
B12 levels can decrease with age, as well as being lower in people who have undergone weight loss surgery, or suffer from multiple sclerosis, pernicious anaemia, Crohns or celiac disease
Charlton M, Viker K, Krishnan A, Sanderson S, Veldt B, Kaalsbeek AJ, Kendrick M, Thompson G, Que F, Swain J, Sarr M (2009) Differential expression of lumican and fatty acid binding protein-1: new insights into the histologic spectrum of nonalcoholic fatty liver disease
thus, aside from a few key exceptions, T-cell escape is rare [61, 86, 87]
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