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The Institute of Medicine reports that no adverse effects have been associated with excess vitamin B12 intake from food and supplements in healthy individuals. However, if youre not deficient in vitamin B12 to begin with or you dont address the underlying reasons you might be deficient, i.e
While toxicity is rare, excessive intake of certain B vitamins (particularly B or B) from multiple sources could increase the risk of side effects (like niacin flush or peripheral neuropathy)
A few considerations: Niacin flush : High-dose niacin (not the same as NMN/NR) causes flushing
If you have thinner skin, especially with aging skin, or you are also taking any blood-thinning medications, you are most likely to develop bruises after your treatment
Ketoconazole, an antifungal antibiotic, interferes with testosterone and sperm production
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