i wouldn't touch this shit with a ten-foot pole.
they are only able to sell this stuff because people are ignorant. and they want you to remain ignorant - they'd never tell you what it is, so nobody is ever in a position to make an informed decision about what the drug does, what its relative safety is, effects profile, half-life, potential interactions.
at least an intelligent research chemical user can do extensive investigations before trying something.
with this garbage, you are probably getting an adulterated product for an enormous mark-up. most of these chemicals can be bought very cheaply - and at least you have some idea as to what you are getting if you decide to import the pure substance.
in the event of something going wrong, you will never know what you've consumed - in case you have to tell emergency room staff or whatever.
in the name of harm minimisation i would urge you to do a lot of reading on the subject if you want to explore this world.
research chemicals are a risky enough proposition without it being a lucky-dip as well. who fucking knows what's in it? a cocktail of drugs, or just a single substance?
don't get sucked into buying this over-priced, misrepresented, glossy-packaged horse shit.
there is a reason these sorts of "legal highs" (for want of a better term) are looked down upon - it's a mug's game, and i think the people selling it are fucking crooks. rich crooks, i imagine.