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L-carnitine is an endogenous substance that the body can produce itself, but not in sufficient quantities in certain situations

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doi: 10.1016/j.amjcard.2006.08.051

Normal elderly adults (mean age 68) experiencing transient insomnia (n = 35) during the first two nights in a sleep laboratory were evaluated in a double-blind, crossover, 2-night trial comparing four doses of zolpidem (5, 10, 15 and 20 mg) and placebo

Then, they did comparisons