how often should you inject vitamin b12 Dosages: Your GoodRx Guide The Timing of B12 Injections:

One review concluded that vitamin B12 plays a key role in fat metabolism, noting that a deficiency could be linked to increased fat accumulation and obesity ( Another animal study found that severe vitamin B12 deficiency led to a significant increase in body fat percentage and cholesterol levels in pregnant mice ( Whats more, one animal study showed that administering B vitamins to rats fed a high fat diet reduced weight gain and increased levels of several enzymes that influence metabolism, compared with a control group ( However, current evidence is lacking, and additional high quality studies are needed to determine how vitamin B12 may affect metabolism and body fat in humans

Image: Dragana Gordic/Getty Images About the Authors Toni Golen, MD, Editor in Chief, Harvard Women's Health Watch

Vitamin B12 supplements can also be used if necessary

Other compounds in this category commonly studied alongside GHRPs/GHRHs include Tesamorelin, Sermorelin, and AOD-9604 for a closer look at how these compare, see our guide on AOD-9604 vs MOTS-C vs Tesamorelin