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In some cases, B12 injections can also cause allergic reactions
The Science
A more evidence-based way to evaluate whether something is helping is to track measurable outcomes with your clinician (for example, symptoms tied to confirmed deficiency, or objective metrics like body weight, waist measurements, and lab work when appropriate)
Always get tested first
Sattar N, McConnachie A, Shaper AG, Blauw GJ, Buckley BM, de Craen AJ, Ford I, Forouhi NG, Freeman DJ, Jukema JW, Lennon L, Macfarlane PW, Murphy MB, Packard CJ, Stott DJ, Westendorp RG, Whincup PH, Shepherd J, Wannamethee SG
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