can b12 injections cause nausea Vitamin for MTHFR: Injection or sublingual B12? – Methyl-Life® Supplements Vitamin B12 Deficiency - Harvard
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10.1111/imm.12873 [DOI] [PMC free article] [PubMed] [Google Scholar] 109.Muller-Steffner HM, Malver O, Hosie L, Oppenheimer NJ, Schuber F

Summary: B12 injections do not promote fat loss in individuals with normal vitamin B12 levels and are not clinically indicated for weight management purposes
12 Top Health Benefits of Methylcobalamin Injection - [2023] Man-made vitamin B12 injection is known as methylcobal

When results show, and how long they last: Many feel a lift within 2472 hours, while others notice gradual improvement over one to two weeks
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