Companies selling peptide blends

[strengthinnumbers]

What do you think about peptide blends? Are they any good or complete waste?

I mean there are Mod GRF1-29/GHRP-2 as a blend and many more peptides blended together. I have read that people who pre-draw syringes for the day don't leave those peptides blended together because it will degrade them but then why peptide companies are selling them?

[BiggYu]

the differences in PH might weaken those peptides

[Other]

I don't really think that there is a huge reduction in effectiveness because I have seen those blends in many places as well and I can't believe that so many companies are selling them if they wouldn't be effective.