Supplements are an unregulated market so doses can vary wildly, even with melatonin.
‘A study published in 2017 tested 31 different melatonin supplements purchased from pharmacies and grocery stores. For most of the supplements tested, the amount of melatonin in the product did not match what was listed on the label.”’
Looks like it was within 10% of described for 71% of supplements (which sounds pretty okay) but there were some big outliers for the rest.
It also suggests the biggest variance was in mixed-supplement pills while pure melatonin pills were mostly within the normal range. Definitely good to know but I wouldn't worry too much if you are just getting basic pure melatonin from a well-known manufacturer.
Sure but if that's mostly the mix of supplements in one tablet versions. If you buy pure melatonin from a respected brand it's going to be a pretty high chance you are getting the right dose.
