For those who have not done so, this interview with Rick Arthur is worth a read:
TGJB: Freezing samples would be expensive. Biologists actually have three main types of freezers, -20, -80, and liquid nitrogen (around -180, all temperatures in centigrade). Which freezer you use depends on what you are freezing and how long you need it to last. As you get colder, the cost gets higher. Among biologists, competition for freezer space is fierce. If you are gong to freeze samples, I think you need to couple it with some kind of profiling, focusing on horses with big jump-ups. (Have you and other figuremakers have ever considered collaborating in publishing a database of huge jump-ups as a means of focusing attention on trainers who get them? Figures would be a lot more valuable without the jump-ups.)
The other significant point in testing, as Rick Arthur points out, is that testing gets a lot more difficult when you move from drugs to things to that are produced naturally in the body.
I am really curious about what's in SGF-1000. Collagen is not a big deal. It is the most abundant protein in the human body. Growth factors could be a big deal, but I wonder why fibroblast (connective tissue cells) growth factor and hepatocyte (liver cell) growth factor would be. I can see that fibroblast growth factor could be performance-enhancing by improving joint health, but are we against joint health? Maybe it has off-target effects. I suspect that even the providers don't know what is in SGF-1000 and that it probably varies from batch to batch. Protein purification is difficult and expensive.