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The synthetic versus natural distinction GHK-Cu exists naturally in human blood plasma, saliva, and urine
However, deficiency is quite common , particularly among vegetarians, older adults, and people with certain digestive conditions
The result is a vicious cycle where declining NAD+ leads to worse metabolic function, which can lead to weight gain, which increases NNMT activity further
But the absence of large human trials isnt necessarily concrete proof MOTS-C doesnt work
There are different kinds of B12
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