That can mean steadier energy and better metabolic support, especially if your levels are low
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(PubMed) Lajous M, Lazcano-Ponce E, Hernandez-Avila M, Willett W, Romieu I
[1] By normalising homocysteine levels, B12 supplementation may reduce this toxic burden and support nerve recovery
A 2019 randomized controlled trial of lipotropic injections (methionine, inositol, choline, B12) versus saline placebo in 120 participants on ad libitum diets found 0.8 kg (1.76 pounds) difference at 12 weeks, not statistically significant (p=0.18) (Karbalay-Doust et al., Journal of Research in Medical Sciences , 2019)
Common side effects associated with the B-12 shot include soreness at the injection site, diarrhea, swelling and itching