It can cause serious breakouts if you overdo it, often mimicking hormonal acne around the jaw, neck, and lower face
A study indicates that regular overdose of isolated vitamin B12 supplements, especially among male smokers, may increase the risk of lung cancer (Brasky et al., 2017)
On the other hand, a vitamin B12 deficiency appears to cause a loss of appetite in some people, leading to weight loss rather than weight gain ( That said, the current evidence is too weak to suggest that a vitamin B12 deficiency has any strong or specific impact on weight be it weight gain or loss
NAD levels decline as part of the natural aging process
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