The only one I know of off the top of my head that carries MK-677 in cap form is Blackstone. However, I can't speak as to the quality of Blackstone's MK-677 simply because I am not associated with the company and have not looked into any testing that has been done. I know there are other companies, but I can't remember their names.
On the other hand, LOTS of companies are selling the other SARM's. Osta has been on the supp market for several years now, while LGD is just starting to show its face. Ironmag Research (the sister company of Ironmag Labs) sells MK-677, but IML does not. The owner of IMR was considering making MK-677 in cap form for IML, but decided against it because he believes it will only be a short period of time before the FDA pulls all SARM's off the shelf and therefore, he doesn't want to make the investment required with GMP-made products.
GMP-made supplements are MUCH more costly (especially the initial investment) than research chems because research chem are not made in a GMP facility and the minimum order can be very small. Basically, I could start a research company tomorrow, order $500 some raws from wherever, bottle it at my house/office (which many research companies do), and start selling it.
You can't do that with GMP-made products. Not only does it cost a good deal of money to have a product made in a GMP facility, but their are minimum orders, as well. I remember speaking with the IML/IMR owner a few years ago, immediately before the release of M-sten, and he told me the initial minimum investment was like 40K or something like that.
Like I said in a prior post, supplement companies can sell SARM's (research chems) just as easily as research/peptide companies. The only difference is in the perceived level of risk. It's a known fact that numerous legitimate, GMP-made, U.S. lab tested Ostarine products exist in cap form on the supp market and have for many years. Whether a supp company sells Osta, LGD, or MK-677 makes no difference, which is why supp companies are now releasing LGD and MK-677 as well. After years of selling Osta without the FDA getting on their ass, they now feel more comfortable selling other SARM's--so they are.
The inference that a supp company would/could never sell a SARM and they can only be found at research companies is ludicrous. In many cases, supp companies have MORE money to spend on products, lab testing, bottling, and advertising. It's not like these raws are hard to find. Anyone can buy them.
More so, VERY few (as in probably a handful or so) peptide/research companies have all their raws tested. In almost all cases they do only random/partial testing...or none at all. Why? Because testing is expensive. Testing every single batch or every single product at accredited U/.S labs would cost more than the raws themselves! Very few peptide/research companies are willing/able to cut into their profits like that, so they don't. Some peptide companies do ZERO testing of their own, instead opting to "trust" the company they bought their raws from--usually a bigger peptide/research company. Often, peptide/research companies simply don't have the money to do testing on all their raws, especially the smaller companies.
On the other hand, many supp companies can easily afford to have all their stuff tested at U.S labs--and many do. On top of that, many supp companies have all their products assembled in GMP facilities, which means professionally made as opposed to being made at home/in garage/in office, etc.
However, in reality, when it comes to orally administered products it doesn't matter that much where they are made, as a less than perfect production isn't going to affect the product's effectiveness or safety. In these cases, lab testing is the only critical factor.
So, you can most definitely find SARM's on the supp market...ones that are GMP-made and tested at U.S labs, with verifiable proof of testing. Some of these companies will send you proof of testing if asked, and in most cases you can call the lab for confirmation, as the document will have all the information required for verification.
The bottom line is that you can find real, properly dosed SARM's on both the research/peptide and supplement market, and it has been this way for years now. The defining difference is that one is in a liquid and the other is in cap form.