A recent review of 41 studies concluded that L-Carnitine supplementation can reduce fasting blood sugar and hemoglobin A1c (a marker of long-term blood sugar levels) while improving insulin sensitivity in people with diabetes, overweight, or obesity
NAD kinase controls animal NADP biosynthesis and is modulated via evolutionarily divergent calmodulin-dependent mechanisms
However, the variability in experimental protocols, compound purity, and organ-specific effects calls for more standardized and rigorous studies
doi: 10.1002/jor.22325
Once again, more is not free: excess vitamin E can be toxic, with reported effects spanning digestive, cardiovascular, and neurological systems, which is why Gutman's general suggestion sits at no more than around 400 IU per day when glutathione is adequate
L-carnitine may help with migraine headaches and may help improve symptoms of COVID-19 in some people