um, to test it you should put a little dot on your arm, wait 3-4 minutes then wash it of, if it doesnt burn or if you dont get a rash, your ok to use it... the only thing is, when you apply it, it smells like bleech that you use for your hair and your skin feels weird after using it, but give it a day or two and you should be ok.
It's not bad at all, it tastes and acts like hot coco, it tastes a lot better in milk but it is still good in water. I'd definitely suggest it, it is cheap and tasty, though it seems to require a bit of extra mixing in water then milk.