SARMS or selective androgen receptor modulators are well-known for giving the same muscle growth results as anabolic steroids but without the negative side effects that comes with the latter. Japanese scientists are doing an experiment on a new SARM known as YK11 which is said to be the strongest amongst all, even more potent than classic steroids such as DHT. YK11 is believed to be a SARM and produce the effect of myostatin at the same time.

Here’s what we know of this product as of today.

YK11 Chemical Composition


Full Name: (17-alpha,20E) 17,20-


3-oxo-19-norpregna-4,20-diene 21-carboxylic acid methyl ester

How YK11 Works

In 2011, Yuichiro Kanno of Toho University published the results of an initial study on YK11, confirming that the rare compound was a SARM.

YK11 attaches itself to the AR (androgen receptor), but only inducts methods that lead to the traditional side effects of androgens such as growth of body hair and prostate and enhanced aggression – to a restricted degree.

Most SARMS have quite limited androgenic side effects, but frequently only quite few anabolic effects when likened to testosterone. But, this doesn’t occur for YK11 as reported in Biological and Pharmaceutical Bulletin in 2013.

Kanno tested C2C12 muscle cells and not lab animals or humans. It has been discovered that muscle cells produce more anabolic factors if exposed to 500 nmol (nanomoles) YK11 than if you expose the same muscle cells to 500 nmol DHT.

YK11 induces muscle cells to make more follistatin (more than DHT does) – a strong myostatin inhibitor. YK11 works through the androgen receptor.

With that said, YK11 can be as good as testosterone in terms of muscle strengthening, but minus the detrimental side effects.


YK11 shows a lot of promise as an apt anabolic SARM. With the muscle growth potential it brings, it’s as effective as anabolic steroids and prohormones without the unwanted side effects connected to the latter.

YK-11 is a powerful SARM supplement promoting massive lean muscle gains which is a great benefit for those wanting to have an aesthetic and shredded physique!

Pick up YK today on SARMSTORE1 for $99.95.

You can buy some liquid YK11 at IRC.bio.

They have the highest quality SARMs at crazy low prices, and it’s the #1 recommended spot on reddit for all your SARM needs.

Check them out HERE.

22 thoughts on “YK11

  1. Steve Watkins says:

    hello, my name is steve watkins. I am an american that has now lived for 10 years in Mexico. I import a variety of supplements and sell them to Doctors and personal trainers here.

    I am certain that your yk11 Sarm will be a big hit here.

    I would like to see if you have any wholesale pricing available. I can see a pretty good business here if I can get a solid price point for these guys here.

    I hope to hear back from you,


  2. Gurpreet singh says:

    I m was going to start my tren acetate/ test cycle/ GW 50516 / OSTA cycle for 10weeks , I dnt know much bout YK11 , shud this be good adding to the cycle or in PCT???

  3. Bill Reedy says:

    I just bought YK11 chem-tek-labs capsules, do I take on an empty stomach or does that matter, and if I take 1 at 7a.m. when or how often do I take the other 2, they are not clear on this? My doc. has me on 200mg/wk cypionate will this go well with the YK11???? Thanks Bill

    • paul says:

      you cant ask questions about taking these sarms for yourself because they are not for human consumption and these places would get in toruble. You have to say something like “I have a lab rat that is going to start taking lgd4033 how long should he be on it”

  4. CHEW says:

    I had this once. Such a great product. Feel so much stronger. Muscle mass just comes. Especially with the diet. This stuff seriously makes more muscle than a cycle. I just can’t get my hands on more. Hard to find

  5. David says:

    Rui products is an amazing research chemical site. I’ve used many of their products in my research and all have had amazing results. I suggest if you want the real deal in research chemicals you check them out. My rats have never had any bad side effects

  6. russell carney jr says:

    Why are they so hard to come by and expensive in these early stages, usually there promoting this at a low price to get it out there. I’ve been trying to buy bulk with testing kits and info. Nobody wants to help?

  7. Mustang says:

    Yk-11 is not a SARM it’s a synthetic steroid. Do your research people. No Animal or Human trails have ever been conducted. 0 information on this Chemical. All studies have been in test tubes. No one knows the dosage or the effects. Stay safe my friends

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