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The rate of L-carnitine synthesis depends on the extent to which peptide-linked lysines are methylated and the rate of protein turnover

J.et al (2016)

Another randomized placebo-controlled trial in 2,330 patients with acute MI, L-carnitine therapy (9 g/day intravenously for five days, then 4 g/day orally for six months) did not affect the risk of heart failure and death six months after MI (50)

Two uncontrolled studies conducted in participants with cirrhosis found that L-carnitine supplementation was safe to use at doses of 0.9 to 1.2 g/day for eight weeks (125) and 1 g/day for 24 weeks (126) and might be considered to control the frequency of cramps