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5-Amino-1MQ inhibits NNMT activity, preserving nicotinamide for NAD+ synthesis and preserving SAM for epigenetic methylation producing a metabolic state in pre-clinical models that has been described as functionally resembling caloric restriction or elevated physical activity at the cellular level

(Except that meat is a perfectly natural source of vitamin B12

So, while sex doesn't inherently make your periods infrequent, the outcome of sex (pregnancy) or the psychological impact surrounding it (stress) certainly can

The Importance of Vitamin B12 Vitamin B12 is an essential nutrient involved in many normal body functions

It is also essential for the formation of red blood cells and energy metabolism