Melatonin is widely used to treat difficulties with sleep and is readily available given the lack of need for a prescription. Because it is classified as a dietary supplement (not a drug) it isn’t regulated by the FDA and there aren’t any dosing parameters set. This has led to a lack of clarity about the recommended melatonin dosage for adults. The dose people take often varies by their best guess and the pill strength sold in the store they are in. What is melatonin and should you take 3mg? 10mg? The recommendations are vague so no wonder people are confused about how to use melatonin!