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The most consistently documented side effect of excessive B12 is dermatological reactions, particularly acne-like eruptions and rosacea flare-ups
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And when your sleep is affected, it can disrupt your metabolism
Documented Reduction in Paresthesia and Burning Sensations High-dose B12 therapy reduces paresthesia and burning in diabetic neuropathy
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Other longevity-focused doctors take a more measured stance on peptides and said far more research is needed in humans before doctors start prescribing these substances
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