Everything You Need To Know About YK11

man showing muscle gains from yk11

If you’ve been paying attention to the SARM wave, you may have heard of YK11.

As a muscle-builder, it’s supposedly more powerful than any other SARM, on par with actual steroids, but doesn’t cause many of the side effects associated with steroid use.

Well, that’s the sales pitch at least…

The truth is, very little is known about YK11 at all, let alone how effective of muscle-builder it is or how safe it is.

Pretty much everything you read on the internet about it is completely fabricated.

It’s either made up by the companies that sell YK11 or just based on the subjective experiences of people who have used it.

So, I figured it’s about time somewhat put together an article that sums up what we know AND what we don’t know about YK11, with as little speculation as possible.

Let’s get into it…

What Is YK11 And How Does It Work?

YK11 is a synthetic steroid compound which is commonly labeled as a Selective Androgen Receptor Modulator, or SARM.

There’s a lot of confusion about whether to classify YK11 as a SARM or as a steroid, but from a chemical standpoint, it’s definitely more like a steroid.

Research shows that YK11 is a partial agonist of androgen receptors which may act as a SARM but, from a chemical standpoint, it doesn’t resemble SARMs like Ostarine and Ligandrol.

In fact, it fits the chemical definition of a steroid entirely because it possesses a steroid back-bone.

If anything, YK11 would be a steroidal SARM.

It’s chemical structure is similar to Testosterone and it appears to produce moderately potent anabolic activity.

Still, since not much is known about this compound, it could very well be as powerful (or more powerful) than some steroids.

Which brings us to the research (or lack thereof)…

Is There Any Actual Research On YK11?

YK11 is one of the latest SARMs to appear on the scene, but given the bold claims made by the companies that sell it about how powerful a muscle-builder it is, you would expect there to be some research behind it.


There isn’t.  At least, not any concrete, human research.  In fact, there’s not even any rodent studies right now.

In vitro (in living cells, but not in a living organism), YK11 has been shown act as a partial androgen agonist, producing anabolic activity that is greater than Dihhydrotestosterone (DHT).

This is believed to be the result of YK11 inducing the expression of Follistatin.

Follistatin is a protein which regulates muscle growth in a ‘yin yang’ fashion with another protein, Myostatin.

  • Follistatin triggers muscle growth and
  • Myostatin stops muscle growth.

By increasing Follistatin activity, YK11 could potentially be quite powerful in terms of the muscle-building benefits.  Perhaps more so than the average SARM

Unfortunately, there are literally NO studies in living animals, let alone humans.

So, for now, the benefits of YK11 are completely based on what happened to some cells in a petri dish.

This makes it near impossible to predict how effective it really is as a muscle-builder or anything about the optimal dosage.

YK11 Dosage

It’s important to understand that, without any data in living animals, it’s basically impossible to determine how much YK11 would elicit some kind of a notable muscle-building effect.

Anecdotal reports indicate people are taking anywhere from 5 to 20mg/day.

10mg/day seems like the average starting point.

It’s not clear what these doses are based on, though.  It seems like people are basing these dosing protocols off of SARMs like Ostarine and Ligandrol.

But these SARMs have actually been studied in humans.

YK11 has not…

So dosing is really a guessing game with this stuff.  Anecdotal reports indicate that it’s effective at just a few mg/day, but many YK11 products are dosed quite a bit higher, in the 20-30mg range.

What Kind Of Results Can You Expect With YK11?

Here’s the thing…

Anecdotal reports indicate that YK11 is an effective muscle-building compound, but we have no solid research upon which to base our expectations.

To complicate matters further, a lot of people are stacking YK11 with SARMs like LGD-4033 and, in some cases, MK-77 (a GH-secretagogue).

In these types of situations, it’s basically impossible to tell how much YK11 is contributing to the overall result.

From what I’ve gathered, it looks like YK11, dosed between 10-30mg/day, can result in lean muscle gain in the high single-digits or low double-digits (8-12lbs maybe) over a period of several weeks.

Does YK11 Have Any Side Effects?

Out of all the compounds labeled as SARMs, including Cardarine and MK-677, YK11 has by far the least established safety profile.

It hasn’t even been studied in mice, so nobody really has any clue what the potential side effects are.

That said, we can speculate…

YK11 appears to cause suppression of natural Testosterone levels, meaning a solid post cycle therapy protocol is probably a good idea.

Due to the fact that it’s chemically a steroid, YK11 could also potentially cause things like:

  • acne
  • joint inflammation
  • high blood pressuure

Of course, side effects will vary from person to person, as is the case with any steroid.

The real side effects you need to be aware of with YK11 is natural testosterone suppression.  Choose your PCT wisely!

Is YK11 Legal?

This is where it gets a little complicated.

SARMs are legal to sell, not as dietary supplements, but as research chemicals.  They must be sold “for research purposes only” and “not for human consumption”.

But YK11 isn’t your typical SARM.

Chemically, it’s a steroid.  So does that make it a Schedule III substance like just about every other anabolic steroids?  Who knows!?

Companies that sell SARMs will fight tooth and nail to maintain that YK11 is in fact a SARM and is therefore legal to buy, sell, and possess, but the government may decide it feels differently.

Right now, YK11 isn’t high profile enough to trigger any sort of legal response, but it’s certainly more likely to be targeted than SARMs like Ostarine or Ligandrol, simply because, chemically, it resembles a steroid.

It’s important to understand that this new wave of unapproved drugs–which includes SARMs as well as drugs like Cardarine and MK-677–represents uncharted territory as far as legality is concerned.

Until a government agency actually goes after a company or two that sells these substances and sets some sort of legal precedent, they will continue to operate in a gray market.

The important thing is, as a consumer, you’re very unlikely to get in any kind of legal trouble for buying or possessing YK11.

The DEA isn’t going to kick your door in for ordering a bottle or two, but the companies that currently sell YK11, claiming that it’s a perfectly legal SARM, may eventually see some legal action as a result.

Only time will tell!

Where To Buy YK11

A quick google search yields various vendors of YK11 but, as is the case with all SARMs and gray market research chemicals, not all vendors provide a high quality product.

I wish I could point you in the direction of a vendor that I know to be trustworthy, but I’ve never actually tried YK11.

Ideally, you should go with a vendor who accepts credit cards.  That way, if anything goes wrong, you can dispute it with your credit card company.

Any vendor who accepts credit cards doesn’t want to risk getting a chargeback, so they’re more likely to provide quality products and decent customer service.

There seems to be a few vendors who offer a Certificate Of Analysis (COA), allegedly proving that their YK11 is high quality and not contaminated or high in heavy metals.

I wouldn’t personally trust any companies COA, though, since most of those are provided by the manufacturer.  Obviously the manufacturer isn’t going to try selling YK11 with a COA that says it’s inferior.

Just a thought…

The Bottom Line On YK11

YK11 isn’t a SARM.  It’s actually a steroid.

It’s also EXTREMELY under-researched.  There are absolutely no studies in animals, let alone humans, so it’s unclear how effective it really is more building muscle, burning fat, etc.

Furthermore, there’s no established protocol for dosing, so people just seem to be making it up as they go along.

If you do decide to give YK11 a shot, be sure to let me know how it goes though!

Have anything to add about YK11?  Any Experience You’d Like To Share?  Comment Below…

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