I heard of this spanish fly brand called Black Arrow. Any of you heard of it? Anyway, my main question is, is there any serious side effects to this "aphrodisiac"? Many sites of the black arrow brand claims for it to be 100% safe, and other sites claim for it (not necessarily black arrow but spanish fly in general) to be able to cause convulsions and maybe even death? why are there two different conclusions?

If you take real Spanish Fly it could very likely result in death - see for example the good page about Spanish Fly on this site. That explains the whole scoop about Spanish Fly very well (go back to the main menu and select Spanish Fly). It goes without saying that the product you're talking about is not Spanish Fly, but probably just a harmless drink which is being described as Spanish Fly. If it's a harrmless drink which is masquerading as Spanish Fly it's no surprise if it's being described as 100% safe and without side effects.

Why are there two different conclusions? Because the "spanish fly" you're interested in isn't really spanish fly. It's that simple. It's what's known as pretend spanish fly for simpletons, a bit like fool's gold.

It's 100% safe because nobody is crazy enough to sell you anything that really contains spanish fly.