Myostine (YK11) 📗 Full User’s Guide | Sep 2023

YK11 Myostine Guide Featured Image SARMs Facts

YK11, also known as Myostine, is a very unique SARM. In fact, despite there being an absence of clinical data on this compound, bodybuilders claim it's the strongest out there.

Just one cycle is enough to give you insane muscle growth, which could rival even the most anabolic steroids out there, from testosterone to dianabol to trenbolone.

Here's what you'll learn in this guide:

  • What is YK11?
  • Is Yk11 Legal?
  • YK 11 Benefits
  • Best YK11 Dosage
  • Yk11 Side Effects
  • …and more

So, if you're curious about using Yk11 to enhance muscle growth, improve bone density, and totally transform your physique in just a few months, then by all means, keep on reading.

What is YK-11 (Myostine)?

YK11 is what's known as a steroidal SARM, which makes it far different than any other SARMs out there, and because of that, it's arguably even stronger than RAD 140 or Ligandrol, two of the most potent SARMs we currently know of.

Myostine (YK11) is both a SARM and a steroid at the same time. This arguably makes it the most powerful SARM in existence, although more research is needed to confirm this.

Here are some of the proven benefits of Myostine YK11:

  • Rapid Muscle Growth
  • Stronger Bones
  • Increased Aggression
  • Enhanced Fat Loss
  • Improved Athletic Performance
  • Accelerated Muscle Strength Gains
  • …and more

In fact, this compound is so strong, that taking it will yield similar results to even the most anabolic steroids. I'm talking increased strength and crazy muscle mass gains in a few weeks.

How Does YK11 Work?

YK11 is both a SARM and a myostatin inhibitor, which means that it has two mechanisms of action. This is very unique compared to most SARMs, that only have one.

Here are the two ways in which YK11 encourages muscle growth:

  1. SARM – As a SARM, YK11 will bind to androgen receptors in muscle tissues throughout the body, signaling your muscles to grow bigger, stronger, and faster.
  2. Myostatin Inhibitor – There's something called myostatin in the body, which basically limits how much muscle your body can grow for metabolic reasons. YK11 Myostine completely removes this “cap” from your body, so there's no limit anymore.

What makes YK11 so unique compared to other SARMs, is it was chemically designed to be a myostatin inhibitor in the body. Myostatin limits how much muscle you can put on, so by removing this cap, YK11 basically frees your body up to hit higher and higher limits.

YK11 Legality

Is YK11 legal? Thankfully, yes, it is. YK11 Myostine is legal to buy and sell as a research chemical, and is also legal to possess everywhere except in Australia (they're strict).

While Yk11 is not technically approved for human consumption by the FDA, unless you're caught explicitly taking YK11 in front of a law enforcement officer, you should be fine.

The only time to worry about taking YK11 is if you're a professional athlete.

Due to the YK11 SARM being so strong and powerful, it's considered a banned substance according to WADA (the World Anti Doping Agency), so you may get tested as an athlete.

Other than that, it is 100% legal to buy and sell.

YK11 Benefits

Now let's get into the fun stuff. There's a reason why so many people are using the YK11 SARM for bodybuilding purposes – it's an extremely potent selective androgen receptor modulator, that will yield insane muscle growth, strength, bone density, and more.

Here's an overview of the Yk11 benefits:

  • Pack on Lean Muscle Mass
  • Amazing for Muscle Building
  • Shreds Off Excess Body Fat
  • Drastically Improved Strength

There's a reason why YK11 is one of the best selective androgen receptor modulators on the market right now. YK11 Myostine is hands down one of the strongest SARMs there is.

Enhanced Muscle Growth

While there aren't a lot of human studies to pull from, and YK11 has mostly been researched using cell studies, there is a lot of user experiences we can pull from here.

According to most anecdotal experiences, and based on the existing research, most users experience insane gains of 30+ pounds of muscle, even from a single bottle of YK11.

It is speculated that the YK11 SARM accomplishes this due to its unique chemical structure, being part synthetic steroid, and part chemically engineered SARM, designed to not only tell the body to build muscle, but to also reduce muscle-limiting compounds in the body. [R]

In short, the YK11 SARM will send your body into muscle growth overdrive.

Dosage & Cycle Facts

What's the ideal dosage of the Yk11 SARM? There's really no established dosage information we can pull from, but for optimal results, most people recommend 10mg/day.

Here's the dosage facts for YK11:

  • Beginner Dosage: 5mg/day
  • Intermediate Dosage: 10mg/day
  • Advanced Dosage: 20mg/day

Keep in mind that the more you take, the higher the odds of potential side effects are. So, if you want to be safe, which we always recommend at SARMs Facts, just try taking 10mg/day.

This dosage of the YK11 SARM is more than enough to pack on more weight, encourage lean muscle mass growth, and the development of new muscle cells, with minimal side effects.

YK11 PCT Guide

While every selective androgen receptor modulator is different, we definitely recommend you take a PCT for YK11. It's extremely powerful, so a post cycle therapy is absolutely mandatory.

One side effect of the YK11 SARM (as well as other SARMs) is mild testosterone suppression, which can lead to increased levels of estrogen, which is dangerous as a man.

To fight this, simply grab a bottle of Testomax and take it the day you finish your YK11 SARM cycle. YK11 has a short half life, and will be out of your system in a few days, so you should start taking your post cycle therapy 48-72 hours after your last dose of YK11.

Side Effects

While YK11 is still legal for research purposes, it's important to note that there is very little human studies and clinical data to pull from. YK11 could potentially be dangerous in the long term, and more evidence is needed to come to a strong conclusion on this.

That being said, thanks to the bodybuilding community, we're fairly aware of the side effects that the YK 11 SARM has on the body, simply from anecdotal experiences and logs.

You may experience the following side effects on the YK 11 SARM:

  • Testosterone Suppression
  • Joint Pain
  • Mild Acne
  • Elevated Liver Enzymes

More research should be done on the side effects of this compound, especially when using it for bodybuilding athletes, but overall, the existing evidence suggests it's safe in the short term.


In conclusion, YK 11 is an extremely powerful synthetic steroid and SARM put into one extremely powerful compound. More data is needed on this supplement, but one thing is for sure – it's probably the strongest SARM that we currently know of.

If you want to buy some, we recommend you get it from here – the only source we trust.

LEGAL DISCLAIMER: The information on this page is intended for entertainment and information purposes only. It is not a substitute for professional medical advice. Always check your local jurisdiction’s laws before buying anything or doing anything.