YK11 is a powerful SARM; a Selective-Androgen-Receptor-Modulator that has a greater propensity to induce both myostatin inhibition    and to induce rapid muscle growth quicker than any other SARM    it is more potent than DHT and other androgens in binding to the androgen receptor   .
These are all facts. The science is clear cut, what isn't so simple though are the so-called 'sources' which all claim to offer the chemical at a fairly ''reasonable'' price but either have nothing to show for it; lab-tests or otherwise or have been reported to have poor or inconsistent quality.
So all we have to rely on is reviews and the third-party COA's which may more accurately tell us who is a legitimate supplier of YK11 versus the mock-ups and phonies.
I'm going to tell you which suppliers I'VE actually tried out, and who provides not just Quality, but Consistency...with references.
YK11 Suppliers List
IRC.bio : A vendor that is well-reviewed    and respected, and has all of the right paperwork to show for their legitimacy. They sell YK11 as a solution, and theirs has been remarked as the most potent and always consistent. The delivery vehicles (chemicals that are Safe and help absorption) that they use are unique to them. They also have a team of well-trained Chemists available to answer questions!
CEM-Products : Consistently, and for years has been around, fulfilling orders in a timely manner and delivering new & quality products, they do their jobs well and stay on top of the game, and, like IRC.Bio, are well reviewed   . Their PT-141, Caber and YK11 are their best products IMHO.
RUI-Products : Another three letter code-phrase, but this one is equally legit, RUI has been around for years as well and has not disappointed much, hardly at all in fact, there were a few isolated cases but for the most part, any problems with orders were resolved when asked. I have not been disappointed by any of their peptides   .
International Peptide : Another well-reviewed source    and very high-quality YK11 indeed.
While shipping can occasionally take a little longer with them, for the most part they are on-point and very fast and professional. Highly recommended!
Blue Sky Peptide : Blue Sky Peptides are and have been a legitimate source of high-quality peptides since 2014. They have been around and definitely know which products are in-the-game and which are nonsense. Friendly staff members and easily reachable customer support as well as fast shipping make this product the only #5 on this list!