I can tell the difference between name brand and grey, no question. I stockpiled some pens since my doctor made me take it biweekly, and I compared a pen one week vs grey inj the next.
Name brand is the truth. I feel it working within 30 min, suppression hits like a bus, and I always get a slight headache after injection...never with grey really. I can even taste the meds during the name brand shot. No ISRs, no endos/sterility worries, weight melted off...was way cheaper than grey. Every pin day was standardized/the same effect.
Grey gets the job done, but it's not name brand and never will be. Name brand is NOT bac + RUO glp w/unknown fillers. Name brand formula is more pure and tested/optimized for drug delivery. Basic m/p tests can say it's "the same," but it's really not. Quality of API and formulation matter. Think Diet Coke vs offbrand, Advil vs generic ibuprofen. You feel/taste the differences. That's why their formulation techniques are patented.
Long term, I hope there's a path to cheaper name brand Tirz. One can only hope. In the background, I'm building my freezer stash w/the good enough grey. At this rate, buying name brand from other countries might be my best bet, like people do with generic Retin-A overseas. And random note I can't wait to try name brand Reta/Elora, I know it'll go crazy.