Yes! A helpful indicator on reliability is to see the reviews on Amazon about it and if you're just buying it from an Amazon seller, see the % feedback of the seller. A good seller has a rating 95% and above.
I buy skincare products and cosmetics from Amazon all the time. From both Amazon UK and Amazon USA. It's reliable. And I've bought Asian products from the sites too no problem.
Not the same deal, but if you're worried about everything shipping without spilling or getting beat up all the time, I wouldn't worry. As a Warhammer player and model builder, I buy pots of acrylic paint, single paintbrushes, fragile plastic and resin kits on Amazon all the time with no issue. The only shipping issues I've ever encountered are dinged corners on every dang book they mail. So I wouldn't worry about getting dried or unsealed stock in the mail.
if its from recognised brand, its no different to buying the same product anywhere else. if you buy something from a random seller in china, maybe not, but if you're buying a product you can get from other places from a brand/seller you know, it'll be fine
Depends on who's selling. A vreat tip I received last week was to email the person selling the product, like asking them something about the product or shipment or whatever, and see what their response is. Act upon that response.