This article was reviewed by Lynn Marie Morski, MD, JD. Key Takeaways: Tirzepatide with B12 is sometimes combined as a weekly injection for weight loss. Vitamin ...

Vitamin B12 for weight loss: Does it work? Since the dawn of the Internet (and probably well before), there have been several solutions sold for weight management — including vitamins for weight loss.

B12 shots work fast but don’t last long. Most leaves your body within a day, though some is stored in the liver. Regular injections may be necessary to maintain steady levels, especially if you have ...