Swallow hook,line and sinker

It is really easy to make dollars in China,lol.
The control of Health food products is not strict and advertising often claims that they can cure certain diseases.Melatonin is a big hit,it's even more expensive than it's in North American(about $10 for a bottle of 100).People think Melatonin is magic but in fact it's basically a hormone which is produced by human body to regulate sleep pattern.It helps in jet-lag and may help one to sleep better in short term.But in long term,who knows if it's harmless or not.