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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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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.