The interest traces to a 2014 Nature paper showing that knocking down NNMT in fat and liver protected mice against diet-induced obesity, glucose intolerance, and fatty liver, partly by shifting adipose NAD+ and SAM levels [4]
[1] If you experience persistent or concerning symptoms after starting B12 supplements, particularly skin changes or gastrointestinal issues, it is advisable to discuss these with your GP rather than assuming they are directly caused by vitamin excess
That means rebuilding a balanced eating pattern, increasing nutritional variety, and developing habits that can realistically continue beyond the short-term program
Science Behind B12 Shots and Weight Loss Most of the science regarding the shots has been related to their contribution to energy production and metabolism
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