l carnitine symptoms L-Carnitine: Benefits, Uses, and Side Effects When to take L-carnitine: Dosage,
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Melatonin appears to be a safe medication, particularly when compared to other sleep aids, but it remains understudied in older adults who show higher absorption compared to younger adults [227]

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doi: 10.1097/PRS.0000000000006084 66 OzerK

Also, most are difficult to get your hands on so you would have to buy them on the black market, pay obscene amounts of money, and, even then, have no guarantee that you have the real and pure thing