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But people can get blemishes from flu shots, so there is no direct correlation that B12 causes blemishes. Unfortunately though, theres no way to know beforehand if B12 will cause a breakout

Do not start B12 supplements before testing if deficiency is suspected, as this can affect diagnostic accuracy

Long-term efficacy is even more uncertain

Although the full trial data has yet to be published, the companies say there have been no serious safety concerns

When experiencing brain fog, individuals may struggle with coherent thought processes, find it challenging to focus, and experience frequent lapses in concentration