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The two most widely used vitamin B12 shots contain either man-made Cyanocobalamin or naturally occurring Methylcobalamin and do not require a prescription

Dexpanthenol (Vitamin B5) Dexpanthenol is required for the metabolism of carbohydrates, fats, and proteins to produce energy

Vitamin B12, also known as cyanocobalamin, is an essential water-soluble vitamin that helps with DNA production, metabolism, red blood cell (hemoglobin) formation, brain functionality and nerve cell health in the human body

For individuals with a diagnosed B12 deficiency or impaired absorption, the dosage for B12 injections is significantly higher to replenish stores and manage symptoms

So yeah, talk to your doctor first