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Also notes it is excreted in breast milk but is safe at nutritional levels)

Hair greying is not listed as a recognised symptom of B12 deficiency in UK clinical guidelines, and testing for B12 deficiency solely for hair greying is not routinely indicated without other compatible symptoms or risk factors

Retrieved August 2, 2014

The following populations have no published exposure data and would generally be excluded from research-context use: - People who are pregnant, trying to become pregnant, or breastfeeding

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