What Is YK11 SARM – How to Use It to Get Results and Avoid Side Effects

What Is YK11 SARM – How to Use It to Get Results and Avoid Side Effects

12 min read


20 Mar 2024

What is YK11 SARM?

If some users are to be believed, then YK11 is not your average SARM. Far from it. Many would describe it as a ‘super SARM’ because of its SARM-steroid hybrid status.

Alongside promising users that it can help them to reach their full physical and mental potential – with none of the nasty side effects (supposedly) – YK 11 SARM can also stimulate quick muscle gains; bolster fat loss, and improve bone health.

The truth is, YK11 is a synthetic steroid that has been created by directly altering the chemical structure of DHT (a hormone that occurs naturally in the body) – a stronger form of testosterone.

The Science

Now here is where things get tricky because there are multiple theories surrounding YK 11 SARM.

The first is that is a myostatin inhibitor. This theory arose following a cellular study, where YK-11 was found to increase muscle mass by boosting the growth of follistatin (a myostatin inhibitor) which is an essential muscle building protein.

The second is that it is a powerful SARM (selective androgen receptor modulator).

This one is based on a separate study where YK-11 was discovered to stimulate bone-building proteins – a common occurrence amongst a lot of top name SARMs. Similarly, numerous studies have shown how YK11 only selectively binds with androgen receptors found in your bones and muscles. This again points towards it being a SARM.

By focusing purely on the androgen receptors there, it can increase your ability to build up lean muscle mass whilst strengthening bone density.

Things to consider:

  • So far the only studies this SARM has seen are cellular ones. No animal ones and no human ones. This means that despite all the claims surrounding this SARM, there is actually no evidence to back them up, so you need to take their claims with a pinch of salt.
  • Like all SARMs, YK-11 has been banned by the WADA, making it illegal and off-limits to competing bodybuilders and athletes.

How does YK11 work?

Closeup of sporty muscular man arms showing sports and fitness supplements

Remember how we mentioned that YK11 is synthetically altered DHT and that it will only bind to the androgen receptors found in your muscles and bones? Well, alongside triggering natural growth, and encouraging good prostate health and proper development in puberty; YK11 also only activates androgen receptors partially, preventing their full activation. As a result, this limited activation can increase the activity of catabolic androgen genes.

At the same time, YK11 can help inhibit myostatin activity by increasing the presence of follistatin in your body. As these levels rise, this will help to keep your myostatin levels in check and prevent it from hindering muscle growth/stopping your muscles from getting too large.

And this is the only SARM known to inhibit myostatin. Which is good news for you, as you’ll be able to enjoy unbridled gains and muscle growth, day after day.

Another positive YK11 result you can look forward to is its ability to affect DHT-like pathways. By activating protein kinase B, this sends signals to your brain to increase the creation of bone building cells, and encourage greater bone growth.

YK11 Results – Potential health benefits of YK11

We’ve touched on two of these already. However, to help you get a better idea of how YK11 works; here are its most common health benefits:

  • Increased muscle size

YK-11 may not be a traditional SARM but it can still stimulate muscle growth and produce new muscle cells (by naturally increasing follistatin cells), whilst suppressing myostatin (a protein that stops excessive muscle growth).

  • Numerous users have reported benefiting from 10-15lbs worth of lean muscle mass gains in just one 8 week YK11 cycle.
  • Fat reduction

Alongside encouraging lean muscle mass growth, YK 11 SARM can also cause significant fat losses in a short space of time.

  • Healthier, stronger bones

A key part to keeping your bones healthy is sex hormones. Studies suggest that YK11 can help to improve your bone strength by binding itself to your androgen receptors. It can also increase the level of activated PKB (protein kinase B) in your cells, resulting in bone growth.

  • Increased strength

The idea of strength moves in an endless cycle, namely because they are so intimately entwined. When it comes to increased strength – as you are able to lift more weight; more muscle fibers will be stimulated.

Benefits for bodybuilding

Truthfully, a lot of the above health benefits could easily be applied to bodybuilders.

From stimulating increased lean muscle mass, to boosting fat loss and protecting your bones from density loss and fractures; by taking just 5mg of YK-11 a day (over 4 weeks) you can: gain over 5lbs of lean muscle; increase your chest, arm and calf measurements, and lose 2% body fat.

PLEASE NOTE: this figure is based on the average results of a lot of users.

What makes YK 11 SARM so appealing to bodybuilders is the way that it builds muscles by facilitating follistatin.

By tackling muscle growth in such a unique way; you can escape with little to no side effects and will suffer from only mild testosterone suppression – which can be prevented with good old PCT.

In fact, users state that you will begin seeing muscle mass gains in as little as a week. Plus, it has proven to be beneficial in both bulking and cutting cycles.

Think about it…

This super SARM can technically help you to pile on lean muscle fast (during bulking), whilst helping you to burn fat and harden muscles during a calorie deficit (cutting).

Who can say no to claims like that? It is no wonder it is so popular.

But here is the thing…

It may be able to do all of this (in theory), but there is a massive difference between what happens at a cellular level and what will actually occur in your body. Without human trials/studies to substantiate these bold claims, all they really are, are words. Nothing more.

Hell, even YK11 reviews are not 100% reliable, as these claims are clouded by their varying dosages, Y11 cycles and what they stacked it with.

YK11 side effects

There are some who will swear blind that YK11 SARM doesn’t cause any side effects. But we have to disagree. Sure, a lot of them can be remedied once you stop, and yes, they appear to be temporary. However, we view any negative change to your body as a side effect.

Take a look at the following:

  • It has got a steroidal structure

Making it not your average SARM

  • Testosterone suppression

Users have reported drops in natural testosterone production following a YK11 cycle. Admittedly, it was only temporary and was easily restored with the help of PCT, but we advise you to be cautious.

  • Liver toxicity (maybe)

Whilst most SARMs don’t have to deal with this; due to its hybrid steroid nature – and the fact that at a chemical level it is close to steroids – there have been some reports of it damaging your liver.

True, this hasn’t been fully confirmed but it is easy to see the potential for it.

  • No human/animal studies

We know this isn’t an actual side effect, but it is a BIG con that you need to be aware of. Why? Because all of its claims are based on cellular studies. There is no evidence proving that it can build lean muscle mass and burn fat in real people.

  • Long term risks unknown

And this is another downer to the lack of human studies. It is all based on speculation with no real guarantee that your body isn’t at risk or in danger.

  • Health issues

As YK11 is so strong – and similar to steroids – there is a growing concern that it may affect hair growth, prostate health, the pitch of your voice and other organs. Other health concerns include oesophagus, stomach, skin and prostate cancer (due to too high a follistatin presence); although it has been positively linked to breast cancer.

  • Increased aggression

It might not cause full roid rage, but users have reported feeling angrier, more aggressive and being quicker to react outside of the gym due to it suppressing natural hormone production.

  • Joint pain

This is a common complaint amongst YK11 users.

  • Hair loss and mild acne

Now, most of these are due to a too high a YK11 dosage, so by taking the correct amount you can minimize this risk.

Similarly, all of these side effects are based on user experiences NOT research or clinical studies.

Does this mean they don’t exist? Yes and no. Personally, we feel that they are still a very real possibility, as they are all common side effects of SARMs and anabolic steroids. The proof may be lacking, but the personal experience is there.

How to use it – YK11 dosage and cycles

With as little as 5mg of YK11 SARM a day (taken over 4-8 weeks), you can begin to see positive muscle gains. However, most YK11 users recommend taking 10-15mg a day. Any more and you risk experiencing more negative side effects.

What else do you need to know?

  • Start small and only build up your dosage if you experience no side effects.
  • Cycle One: 5mg of YK11 a day for 6 weeks. NOTE: this cycle is great for newbies.
  • Cycle Two: 10-15mg a day for up to 8 weeks. NOTE: only for experienced users.
  • Female users: they typically take only 0.5-2mg of YK11 a day.
  • Half-life: lack of research means the half-life of this SARM hasn’t been established yet (although anecdotal evidence suggests it’s pretty short). Because of this, users recommend splitting your YK11 dosage in two to help maximize its half-life and keep your blood levels stable.
  • 15-30mg of YK11 is too much and will increase the risk of side effects.
  • PCT is a must – YK-11 may only cause mild testosterone suppression, but to be on the safe side try PCTing it with Nolvadex or Clomid.
  • Stacking – for optimal results, users recommend stacking it with RAD140, LGD-4033 or Andarine (just remember to keep your YK11 dosage to no more than 5mg a day).

Where to buy YK11

FACT: Like all SARMs, YK11 is prohibited in professional sports and has been banned by the WADA. Meaning no matter how it has been labelled, it is still illegal and will get you kicked out of competitions.

FACT TWO: YK-11 can only be bought as a research chemical. This means, yes – it is technically possible to buy this SARM BUT you will need to purchase it from a trusted, reputable and approved source, so you don’t end up with a fake.

In all honesty, we recommend steering clear of YK11 because any supplement that has been banned cannot be entirely safe for your body. Why take the risk?


True, YK11 SARM may be one of the strongest compounds around. And yes, it appears to produce rapid lean muscle gains and fat losses in a short space of time (10-15lb gains during an 8-week cycle). However, this product isn’t entirely risk-free or innocent.

First, there is the fact that it has never been tested on humans or even animals. NEVER. All of these bold bodybuilding claims are based on cellular studies. There is no real proof that it will work at the level these sites claim it will.

Second, it has been banned by the WADA and is prohibited from use in competitions. In other words, it is illegal to buy unless it is for research purposes.

Now, you might claim that your workout regime is a form of ‘research’. But if you’re serious about bodybuilding and competing, then this SARM CAN and WILL get you kicked out.

Third, there is no knowledge of its long term impact.

Arguably, you could say that with such minimal research, we don’t know for certain that it will cause the side effects already on its list. But given that it is based on the reviews of hundreds if not thousands of users, then there must be an element of truth to it causing acne, baldness, testosterone suppression and aggression.

The real concern is – what are its long term implications and how closely related to steroids is it? After all, anabolic steroids have got a long history of causing some nasty side effects. If it is truly a hybrid of anabolic steroids, then there is a greater chance of you suffering from these side effects.

Why take the risk? Why expose yourself to such dangers when there are safer legal and natural alternatives available? You shouldn’t have to.

That is why if you’re serious about packing on muscle, strengthening your bones and burning fat; we recommend sticking to natural legal alternatives.

What are other safer options for muscle building?

The bottom line is: genuine SARMS are illegal (unless bought for research purposes only) and are becoming scarcer as the government cracks down.

So YES, whilst they are safer for your body than steroids, and can produce positive muscle mass gains, fat loss, and recovery (although in a milder form than steroids) – anything you find online won’t be the real deal.

Far from it!

If anything, fake SARMs have the potential to be more dangerous than steroids, as who knows what they have put in it!

That is why, if you want to experience lasting muscle mass gains, we strongly recommend pursuing natural supplementation, such as our latest line; formulated of 6 SAFE and NATURAL SARMSs alternative supplements.

Discover the range of true bodybuilding must-haves for the Gym Beast who cares about their health from the inside out.

CrazyBulk supplies a range of 100% legal bodybuilding supplements that can be safely used to:

  • torch fat
  • skyrocket testosterone
  • improve muscle growth
  • increase muscle strength
  • boost muscle repair

Man or woman – they can offer you a safer, more natural way to achieve the body you want, with none of the side effects of steroids and SARMs. So why wait?

Shop the range here.

Testol 140

Get Swole With CrazyBulk

No matter what you’re training for, our hardcore legal steroid and SARMs alternatives will help you reach your goal!

Take your body to the next level with our range of best-selling supplements for cutting, bulking and strength.

Over 299,434 purchases

Over 509,389 bottles sold

Over 30,563,340 pills taken



Flash Sale

Get 20% off using the code sale20



Offer expires in






Offer expires in