What vitamins can you take to gain weight?

　　In general, taking vitamins does not directly cause weight gain. However, consuming vitamin D, vitamin B1, and vitamin B12 can help promote metabolism and nutrient absorption, thereby supporting healthy weight gain. The details are as follows:

　　1. Vitamin D

　　Vitamin D enhances the absorption and utilization of calcium, promoting bone growth and development and increasing bone density. Additionally, vitamin D helps regulate insulin levels and promotes fat cell differentiation and fat metabolism, which may contribute to weight gain.

　　2. Vitamin B1

　　Vitamin B1 supports energy metabolism and glucose utilization, helping to increase the body's energy levels. It also stimulates appetite and enhances gastrointestinal motility, thus aiding in increased food intake and improved nutrient absorption.

　　3. Vitamin B12

　　Vitamin B12 promotes protein metabolism and utilization, which helps increase muscle mass and body weight. Furthermore, vitamin B12 supports red blood cell production and oxygen transport, contributing to an improved metabolic rate.

　　Besides these vitamins, others such as vitamin B6 may also play a role. It is important to note that excessive vitamin intake does not enhance weight gain and may instead lead to vitamin toxicity and other health problems. Therefore, during the process of gaining weight, individuals should consume nutrients in appropriate amounts according to their personal needs and under the guidance of a nutritionist, maintaining a balanced diet and engaging in moderate physical activity. If any adverse symptoms occur, it is recommended to seek medical attention promptly.