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B3 that is not methylated can be instead transformed into another molecule called nicotinamide adenine dinucleotide (NAD+), which is essential for producing energy, repairing DNA, and other benefits

Vitamin B12 deficiencies due to malabsorption which may be associated with the following conditions

A 2020 study of "wellness" B12 injections in non-deficient adults found no improvement in energy, mood, or cognitive function versus placebo at 4 weeks (Wolffenbuttel et al., Nutrients , 2020)

Severe side effects are rare but include anaphylaxis (especially in those allergic to cobalt or B)

Most commonly reported Mild stimulant-like effects (warmth, slight resting heart-rate rise) in the first 1 to 2 weeks

This essential nutrient plays a crucial role in nerve function, red blood cell formation, and DNA synthesis