These studies only show a link between vitamin B12 deficiencies and weight gain, Matthew Cowling, D.O., a physical medicine and rehabilitation specialist in Madison, Wisconsin who specializes in weight loss, previously told The Edge
Most are animal sources (milk, egg yolks, yogurt, salmon, tuna, beef) which is why vegetarians and vegans have a higher risk of being deficient (3)
Its primary research focus involves elevating intracellular NAD+ levels, which is crucial for cellular energy metabolism, DNA repair, and overall cellular function
In cases where a chronic condition is causing a deficiency, people may require B12 shots around every 2 months