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Scientific Context| One compound that has attracted attention in metabolic and neurological research is Vitamin B12 (commonly cyanocobalamin or methylcobalamin), an essential nutrient involved in red blood cell formation, DNA synthesis, and energy metabolism

While these typically subside within a few days, you should always notify your doctor just in case, Wirtz says

For example, research on B12-deficient individuals indicates significant improvements in memory and attention span with regular supplementation

The researchers looked at the bacteria's gene expression, hoping to figure out why Propionibacterium acnes , which is the most common skin microbe, causes pimples in some people but not in others