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It is synthesised naturally from the amino acids lysine and methionine, primarily in the liver and kidneys, though it can also be obtained through dietary sources such as red meat and dairy products
The majority of these compounds are Generally Recognised as Safe (GRAS) and are available on the market as supplements that can raise NAD + levels in human subjects 120,121,122
doi:10.4239/wjd.v5.i4.444 8
This happens in our eggs, too
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