I'd be wary of ordering melatonin tablets, there's a reason why they won't prescribe it in the UK. Personally I prefer to get my body to produce its own melatonin (darkness therapy), it works very well for me. I did try the tablet form years ago, and it didn't do a thing for me, but I'm afraid I can't remember where I ordered it from apart from somewhere in America. By now I basically avoid ordering anything which is a drug on the internet, it's too risky, and I'm very careful about suppliers for herbs and nutritional supplements.