First of all, thank you for educating the Swimmers : P 1.How toxic is GBL? 2.How do you know if you have dopamine rebound? 3.Does GBL cause water retention? 4.Are any supplements helpful while taking this? (L-tyrosine, antioxidents?) 5.Can someone post a link about the baking soda and microwave method? I did read a study documenting how gbl was non-toxic even at high doses, they tested on rats.