[DanBC]

Melatonin is prescription only in the UK. So, go careful if you're travelling from US to UK with off the shelf sleep meds.

I read some article that investigated melatonin supplements in the US. It said that because supplements aren't as heavily regulated you couldn't be certain which pills had melatonin or how much.

[enraged_camel]

Actually, most brands will list the amount in milligrams on the bottle itself.