Rather, lack of. Melatonin is over-the-counter, generic, badly understood by the people taking it and dosed according to personal preference which means marketing it is all abouy big numbers. Bigger number on package = more sales.

The help aiding sleep is only one function for melatonin. The reason for higher suggested doses is due to its anti-oxident function. From personal experience melatonin needs to be paired with vitamin e to really clear out over night. I take vitamin e as I get into bed right before I take a melatonin sublingual. Another benefit of melatonin is that it upregulates our insulin receptors.

They’re considered dietary supplements and not medicine, so they’re not meaningfully regulated in the way meds are.

> why is that

Why buy 1mg pill when you can buy 100mg pill?