Is B12 useful for Abnehmen?

The claim that vitamin B12 directly aids weight loss is not supported by robust evidence. B12 is essential for energy metabolism and red blood cell formation, but supplementation in individuals without a confirmed deficiency does not lead to weight reduction. The idea that B12 boosts metabolism stems largely from marketing of supplements and injections. While severe B12 deficiency can cause fatigue and reduce physical activity, correcting a deficiency may improve energy levels but does not directly burn fat. Clinical studies show no significant weight loss from B12 supplementation in those with normal levels. For weight loss, a calorie-controlled diet and regular exercise remain the cornerstones. B12 testing is only warranted for at-risk groups (vegans, elderly, gastrointestinal disorders). The evidence is mostly marketing-driven or based on weak mechanistic links.