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Many patients report steadier energy over time

Avoid strenuous exercise for a few hours if you feel lightheaded

A single unusual case report did describe a life-threatening eosinophilic pneumopericardium effusion (a type of fluid accumulation around the lungs and heart with high eosinophil counts) in an elderly woman who had been concurrently taking high-dose pantothenic acid (vitamin B5 at 300 mg/day) and biotin (10 mg/day) for two months

Vitamin B12 is an essential water-soluble vitamin that plays a role in many bodily functions, DNA production red blood cells nerve cells Without vitamin B12, a person may feel tired and weak due to megaloblastic anemia

Most side effects are mild and go away quickly