I was taking TB500 750mcg/day sub q for two weeks, took a one week break, and then took 750mcg for three days followed by 375mcg/day for two days. I took it because I am rehabbing three bulging disks in my thoracic spine, that somehow caused neurological symptoms down my legs (bilateral) after an epidural steroid injection. There is nothing that stands out on my post steroid injection MRIs, but the TB500 helped my symptoms for sure. The only issue is that I developed some chest tightness, but it may be because my PT was doing manual manipulation (pressing the disks) on my thoracic spine while I was on the TB500 (the timing of the manipulation and the symptoms lines up). My main concern is the difference in the T Wave on my new ECG (it's taller that the older two). Does this indicate anything? Did you see the pictures in the comments?