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A 39-year-old member asked:

Does vitamin b1 supplement have any side effects?

1 doctor answer4 doctors weighed in
Dr. Randy Baker
Holistic Medicine 41 years experience
Hardly any: Thiamine, vitamin b1 is extremely safe and well tolerated. Some might occasionally experience stomach upset from it, especially if taken on an empty stomach. It will turn urine yellow and give a strong "b vitamin" odor. You can't really be allergic to b1 per se, but may be allergic to some pills containing b1 if sensitive to the additives or preservatives or source of it.

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