First, thanks again for making that intro post... it gives a lot more background about you.
Regarding Reta... these GLP peptides are extraordinarily potent compared to others. As you already know, peptides like Tesa are potent as well, but GLPs, like Reta, IMO are moreso. You may already know this, GLPs were originally studied and put to trials for diabetes. During trials, extraordinary appetite suppression was also observed. There's nothing like the appetite suppression/control GLPs promote. If you're trying to gain muscle and need appetite, GLPs are likely counterproductive. Keep that in mind.
I like Chase Irons, but personally, disagree with some of his views... from how he reconstitutes his hGH to his way of implementing GLPs. I'm not saying he's completely wrong. I think sometimes he lacks implementation and/or explanation of the full research. Now, he will likely say that's what HE does and what works for HIM. And, that's my point... what he does, or the way he does it, may or may not work for you (you may know this already). There's an abundance of info on Meso regarding GLPs. If you want to learn and research more, there are many threads, with studies linked, to gain proficient knowledge about them.
Lastly, LabCorp labs cost much less than Quest for the identical lab. Private MD provides access to both, but their rate with LabCorp is not as low as other services like Fitomics. For example, CBC costs about $35 with Quest through PrivateMD (less with coupon or code, $22.50). With Fitomics, CBC is about $5. To me, Quest seems to be a more premium lab with faster turnaround, and that sometimes comes in handy. For Quest, with a coupon, Private MD offers competitive pricing. But, services that have the low rates through LabCorp will save you a lot more. It may take a little studying to find which service works for you. Again, there is a ton of info on Meso regarding discount labs.