This drink by Quatreau is a difficult one to review because I didn't care much for it but I think many people will. It has no sweetness really at all and tasted a little bit bitter to me. 

It wasn't bad tasting but it wasn't good tasting either, as I found it needed a bit more sweetness to cut the slight bitter taste that I found it had. 

It's low dose at only 2mg so it's a good beginner drink. It's also fast-acting so you can expect to feel it after about 15 minutes or so. If you prefer no sweetness and like blueberry and acai flavours, it's worth a try, I didn't think it was bad, just not to my liking.