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There is no evidence that people with adequate blood levels of folic acid will gain weight if they take supplements. However, weight loss is one possible side effect of a folate deficiency. If someone makes up for a folic acid deficiency by supplementing, he or she may regain the weight lost because of the shortfall.
Folic acid should not make you gain weight. Side effects at all are extremely rare.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.