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Unlike cysteine (which is unstable and poorly absorbed), NAC is stable, well-absorbed, and rapidly increases intracellular glutathione
Theyve been through large clinicals trials involving tens of thousands of patients, been approved by the FDA and been prescribed for diabetes for more than 20 years
Methionine supplementation at very high doses may increase homocysteine levels if B12 and folate are insufficient
The NIH lists dietary carnitine bioavailability around 63-75%, compared with about 14-18% for supplemental L-carnitine
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