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Fukagawa NK, Yu YM, Young VR: Methionine and cysteine kinetics at different intakes of methionine and cysteine in elderly men and women

There are many different symptoms of vitamin B12 deficiency, but not all of them are visible or easily detectable

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The second is baseline status: someone with already-normal carnitine and a carnitine-rich diet (red meat is the main dietary source) has little headroom for supplementation to raise stores meaningfully, which is why the fat-loss and fatigue effects are weakest in healthy, well-fed young people