Yeah, that's right, most all are too I think. It's funny how TB4 (full sequence) is used so much, and yet I've read more than once that the fragments, including 17-23, are cheaper/easier to make. I used both the full sequence TB4, as well as TB500 Frag 17-23 in my peptide recovery protoco
One of the reasons I'm not a fan of the GLOW and KLOW blends is that you can't get enough TB500 Frag and BPC-157 without getting too much GHK-Cu. I had a torn proximal bicep tendon that I healed much faster than previous tears by blasting 5 to 6mg/day of BPC and TB500, along with a few other peptides, but you wouldn't be able to get that much with the GLOW blend without overdosing GHK-Cu.