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But, there are several reports supporting an association between inadequate B12 levels and premature hair graying, which is grey hair that onsets before the ages of 20-30 (depending on the demographic) (12)
Brain Res Bull (2022) 182:4456
The effects and potential toxicity of other forms remain untested
Some of the longest-running studies looked at berberine as a dietary supplement for colorectal cancer over two years and found only a few adverse reactions.27 But pay attention to your body
DOI: 10.1021/acs.jcim.0c00025 19
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