USA: Consumerlab.com finds most B-vitamin supplements contain what they claim, but often exceed safe levels
Consumers Cautioned to Be Aware of Side Effects with High Dose Products — WHITE PLAINS, NY — ConsumerLab.com announced today that all but one of the twenty-one products analyzed in its B Vitamin Product Review contained the claimed amounts of B vitamins. However, nine of the products exceeded Tolerable Upper Intake Levels (ULs) set by the Institute of Medicine of the National Academies. The risk of adverse effects increases when consumption of vitamins exceeds the UL on a regular basis. The most common ingredient found at high doses was niacin (B3), for which potential side-effects range from skin flushing to liver toxicity.
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