What are side effects of taking vitamin B1 (thiamine) supplements?

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Vitamin B1 (thiamine) rarely causes side effects and is generally safe for most people. Rarely, people may experience a severe allergic reaction to thiamine supplements, causing symptoms such as swelling of the mouth, face, lips or tongue; difficulty breathing; and hives. If these symptoms occur, get medical attention right away. Other side effects may include sweating, tingling, flushing, feeling of warmth, itching, chest tightness, fluid retention, nausea, restlessness, weakness, discolored skin or hives. Talk to your doctor if you develop any unusual symptoms while taking thiamine.

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Vitamins

Vitamins

In the United States, the Food and Drug Administration (FDA) regulates vitamin supplements and provides recommended daily amount information. The FDA says that we should pay attention when considering vitamin supplements, because ...

frequently many different vitamins and minerals are combined into one product.
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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.