The two principles of losing weight are reducing intake and increasing consumption, and vitamin supplementation is also helpful for losing weight. If you try to lose weight by dieting, because you eat less food, you will also consume less vitamins, which will easily lead to various vitamin deficiencies. Cause weight loss sequelae. However, vitamins themselves have no calories, and some vitamins themselves have no calories, and some can also help to metabolize calories. For example, B 1, B2, B6 and B 12 in vitamin B family can promote the metabolism of fat, protein and sugar, and have the effects of burning fat and avoiding fat accumulation.