Cangocases they'd be highly regulated products you can start with this as a guide http://www.chinaimportal.com/aliexpress/ but I'd seriously not go down that road.
Not unless you have the finances for legal protection, business LLC (again for legal protection) and also to have certified labs etc test the products independently.
The person who imports to the USA/EU (eg. the person who owns the shopify store and sells the products) is the one responsible under US law - not the manufacturer. Same with EU etc.
ETA. Also if you care about animal welfare all beauty products, cosmetics like teeth whitening are all tested on animals in China this is law over there - anything used on humans must be tested on animals (even cosmetics) and it can be horribly cruel with extremely lax animal welfare laws over there.