tren-E. But I should also mention I have very low SHBG, so more of the tren will be free, so it probably hits me harder than most. For instance, my total testosterone on TRT is mid-range, but free and bioavailable T are well over the top of the range. And yeah I was surprised too. I'm pretty insensitive to supplements, drugs, and testosterone, as far as side effects go. Maybe tren just doesn't agree with me well?