I'm not saying it's safe. In fact I think there's significant potential for harm from careless use of psychs, and I can't recommend it from a safety perspective.
That being said, if you were going to use it - and this goes for any drug - you MUST test it. You cannot OD on 4 tabs of LSD. If it's actually 2C-B (it's half the price) then you could die.
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If you're on the fence - don't take it.
If you were going to anyway - take it in a way that minimizes harm.