It has been estimated that about 90% of vegetarians and vegans may suffer such a deficiency
(wada-ama.org) The clinical bottom line (Meto-style) AOD-9604 is a legitimate fat-metabolism peptide in the sense that it has: a plausible mechanism, preclinical support, and a history of controlled human trials
There is some research to show vegetarians and/or vegans may not be getting enough B12 and should look to take a supplement if levels are low (chat to Pharmacist or GP)
Lipotropic injections, conversely, are unlicensed combinations of amino acids and vitamins marketed for weight loss, lacking robust clinical evidence and NHS endorsement
Summary: Vitamin B12 treatment typically begins producing early haematological responses within 34 days, with neurological symptoms starting to improve within 12 weeks, though complete symptom resolution may require several weeks to months depending on deficiency severity and treatment route
If your clinician prescribes oral vitamins for maintenance after an injection series, continue as directed and attend follow-up visits to track clinical response and lab values