[PMC free article] [PubMed] [Google Scholar] Wood 2008 Wood L, Egger M, Gluud LL, Schulz KF, Juni P, Altman DG, et al
Table of Contents Feeling constantly tired, unfocused, or just off your game
B12 shots aren't worth much
Ideally, blood tests (including full blood count, serum B12, folate, and possibly anti-intrinsic factor antibodies if pernicious anaemia is suspected) should be performed before starting supplements, as supplementation can affect test results
Research from the NCBI explains that those with severe deficiencies or trouble absorbing B12 might need regular doses to keep their levels steady
Lasting weight change comes from sustainable eating habits, regular movement, and good sleep, with no exceptions