YK11 Side Effects: 3 Things to Watch Out For

The jury is still out on whether YK11 is a selective androgen receptor modulator (SARM) or a steroid. SARMs are a class of androgen receptor ligands that are considered to be a safer alternative to steroids.

This is because SARMs are selective in which part of the body they target whereas steroids are not. SARMs limit their impact to bones and muscles while steroids tinker with your reproductive organs too. But SARMs are banned for human consumption.

Initially, they were tested on mice and rats. The results showed that SARMs can cause a range of cancers in the test subjects. So, they never made it to the stage of human trials.

But they are available as research chemicals in the market because scientists are still exploring their use as therapeutic drugs. SARMs have proven to be useful in avoiding muscle wasting in individuals suffering from advanced cancer and end-stage renal diseases.

In fact, the underground fitness community says the cancers are a likelihood only when SARMs are used for a really long time in high dosage. That is why they recommend using SARMs in short cycles and in very small quantities to build lean muscle mass aka bodybuilding. Sportspersons also use SARMs because they are performance enhancers. This despite a ban by the World Anti-Doping Agency (WADA) on all SARMs.

Why is Y11 different from other SARMs?

YK11 Facts

Now, YK11 is a special case. Some call it a synthetic steroid based on dihydrotestosterone or DHT which is a hormone found naturally in the human body. DHT is a bit stronger than testosterone and targets the androgen receptors in the prostate, hair and liver.

YK11 is popular among bodybuilders because it helps build muscle really quickly. In the underground fitness community, many of them say it has minimal side effects. Now, it is important to note that a lot of information on SARMs is not backed by science because many of these compounds were not tested on humans. So, what you read on the internet is based on anecdotal evidence from individuals who have tried these products.

What we know about YK11 in terms of science is that the YK molecule has a lot in common with steroids than SARMs but it is often labelled as a non-steroidal SARM. However, like every other SARM, it is also consumed in two cycles: bulking and cutting. Bodybuilders have reported muscle gain and fat loss after using YK11 for a certain amount of time.

What are the three most common side effects of using YK-11?

YK11 Side Effects

Nevertheless, it is important to educate yourself about the possible side effects of using YK11. Since there are no studies on this compound, the evidence of side effects comes from bodybuilding logs. While many users report no side effects whatsoever in the short term, some others had difficulties. So, here’s what we know.

Using YK11 might lead to:

  • testosterone suppression
  • increased follistatin levels
  • joint and tendon pain

1. Testosterone Suppression

Testosterone suppression is one of the biggest side effects. However, it is common for all SARMs from cardarine to Ligandrol. In most cases, users have reported mild suppression but this is expected even at a very low dosage of 5 mg.

You know it is testosterone suppression when your energy levels are low, you feel lethargic and/or depressed. So, when on YK11, it is best to prepare for upcoming suppression. This can be done with post-cycle therapy or PCT. Nolvadex and Clomid are used during PCT, which typically lasts for four weeks.

2. Increase Follistatin Levels

YK11 is also known to increase follistatin levels. This can lead to different types of cancers affecting the esophagus, skin, stomach and the prostate. But there is scientific evidence that states the benefits of increased follistatin levels when it comes to breast cancer. 

Researchers also say that using YK11 can damage your liver. This is because its chemical structure is close to steroids that are toxic for the liver.

3. Joint Pain

This has also been reported by some users who consumed YK11. It is probably because YK11 is a derivative of DHT and some of those derivatives are infamous for messing with proteins that in turn inhibit cortisol regulation in the body. It is possible that YK11 is interfering with pathways that facilitate cortisol secretion. This causes severe joint pain.

YK11 is also a myostatin inhibitor. Myostatin plays an important role in maintaining the tendons in our body. So, it has a negative impact on tendon strength too.

However, these side effects can be mitigated by taking supplements or doing post-cycle therapy. But the first thing to remember is to maintain a strict YK11 cycle and dosage. Here are a few guidelines.

Dosage guidelines for YK-11: Be careful

Cycle / Dosage

The general consensus is that YK11 is good for growing muscles and enhancing physical performance. If you are to take it, here’s how you do it.

Newbies must absolutely keep it limited to 10 mg per day. Intermediate users can go up to 15 mg per day and experienced users can take 20 mg per day but at their own risk. Taking 10 to 15 mg per day is considered optimal.

YK11 Bulking and Cutting Stacks

In the bulking stack, consider taking YK11 with Ligandrol and RAD 140. Here is a sample.

  • YK11 – 10 mg per day
  • Ligandrol – 10 mg per day
  • RAD 140 – 15 mg per day

During a cutting stack, you can pair it with cardarine and ostarine. Here’s a sample.

  • YK11 – 5 mg per day
  • Ostarine – 25 mg per day
  • Cardarine – 10 mg per day

Since it is more effective during a bulking cycle, it goes well with RAD 140 and Ligandrol.

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Bottom line: is it worth it to use YK-11?

Final Verdict

The thing to remember about YK11 usage is that it is a very strong compound with side effects that could be quite dangerous if you don’t stick to the cycle and dosage.

It is dangerous to use these chemicals without proper research because a lot of them are available in the black market and companies have a tendency to sell products that are watered down and have a lot of unwanted side effects. 

The way to avoid it is to buy high-quality SARMs from reputed dealers. Check out some of them here.

Chris Jackson
Chris Jackson

Chris Jackson, co-founder of Sarms.io, is a renowned fitness blogger, physique model, and evolutionary bioscience researcher specializing in SARMs (Selective Androgen Receptor Modulators). His extensive work, characterized by cutting-edge research and practical training advice, has made Sarms.io a leading source for accurate, credible information on performance enhancers. With a dedication to improving the understanding and application of SARMs in optimizing human performance, his contributions have not only expanded public awareness but also shaped the conversation around these substances. Chris's pursuit of knowledge and commitment to sharing it continue to inspire many in their fitness journeys.

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