What is the most effective vitamin to gain weight?
                                
                                
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                                    6 min read                                
                            
                                Weight gain is driven by a calorie surplus, not vitamins, which contain no calories and therefore do not directly cause weight gain. However, for individuals experiencing unintentional weight loss due to a nutrient deficiency, identifying what is the most effective vitamin to gain weight to correct the issue can be a crucial step in normalizing appetite and metabolism.