What can the YK-11 SARM, myostatin inhibitor or follistatin activator? For more muscle strength and volume. Find out everything about SARM YK-11 here!
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YK-11 SARM enjoys great popularity among many bodybuilders and strength athletes. More and more athletes resort to the supplement. In this article you will learn everything about the myostatin inhibitor, which is still argued whether it is real genuine SARM or a steroid or something else entirely, but – due to its enormous potency – is counted among them.

  1. What is the Myostatin Blocker / SARM YK-11?
  2. What effect does it have and are there also side effects?
  3. What experience with have users made with YK11?
  4. Where can I buy YK-11?
  5. And what is actually the legal situation in Germany and in competitions?
  6. What is the best dosage and the best time to take? Is YK-11 also suitable for women? And can you stack it?

Note: This blog post is only intended to inform you about YK-11, because the trade, acquisition and use of these substances is regulated in some countries – including Germany. We want to inform here, but not to encourage or instruct consumption.

What is YK-11?

YK 11 is a substance that was discovered by Yuichiro Kanno in 2011. It is often assigned to the group of SARM (Selective Androgen Receptor Modulators). Consequently, this substance is also referred to as SARM YK 11. As written earlier, it is still debated whether YK-11 is a completely true selective androgen receptor modulator.

SARMs, as the name suggests, bind selectively to the androgen receptor and act there. YK-11, full name (17-alpha,20E) 17,20-[(1-methoxyethylidene)bis(oxy)] 3-oxo-19-norpregna-4,20-diene 21-carboxylic acid methyl ester, also acts selectively. But it also blocks myostatin and provides increased secretion of follistatin. So probably YK-11 is something between SARM and steroid.

Incidentally, YK-11 was originally developed in medicine, where it is still in clinical trials today. It acts as an inhibitor of myostatin. This means that it reduces myostatin, the hormone that prevents muscle growth beyond a certain point.

YK-11 Wirkung / YK-11 Effect

YK-11 Effect

YK-11 has a steroidal backbone and thus has a high anabolic effect. It is clearly one of the strongest hardcore supplements on the market.

In addition, it blocks myostatin and improves the release of follistatin. Because both of these things ensure that you can effectively build high-quality lean muscle mass, YK11 has also become so popular with bodybuilders, strength athletes, and other amateur athletes.

But what is myostatin anyway, and why should you suppress it? The protein myostatin causes muscle growth to reach its limits after a certain time – in terms of time and volume. This means that the muscle cannot continue to grow from that point on. Taking YK 11, a myostatin inhibitor, causes this point in time to occur later. This allows the muscle to grow longer and also become larger.

In addition to the myostatin-inhibiting effect, YK-11 can cause increased production of follistatin. Follistatin ensures that the muscle grows rapidly. Thus, YK 11 causes the muscle to grow significantly longer and significantly faster.

The supplement YK 11 has a significantly stronger effect compared to other substances, such as the SARM LDG-4033. However, in addition to the stronger anabolic effect of YK-11, this substance is also characterized by the fact that the side effects – in contrast to anabolic steroids, prohormones, etc. – are very low. We will discuss the side effects below.

Benefits of YK-11 at a glance:

  • inhibits the myostatin gene
  • Increases the release of follistatin
  • increases muscle strength
  • ensures faster muscle growth
  • more power
  • can even increase libido
  • maximizes endurance
  • accelerated fat burning
  • increased pump effect

YK-11 Side Effects

First of all: YK-11 is a really very potent – i.e. strong – substance and not for beginners. Before possible side effects can be described, it must be mentioned that the substance has not yet been tested very extensively. As already described, this is one of the newest supplements and scientific studies with possible long-term(er) consequences are currently not many available. Therefore, we rely mainly on field reports.

Reported were testosterone suppression, increased aggression, mild liver toxicity, which is why Cycle Support is advised. In addition, YK-11 is suspected of increasing blood pressure. This suggests that, unlike other SARMs, YK-11 is not as selective. Hair loss, prostate enlargement and gynecomastia cannot be ruled out in sensitive individuals. However, unlike steroids, consumption was not found to affect potency.

YK-11 for women?

As described in the side effects, it has not yet been clearly proven that YK-11 acts as selectively as other SARMs. Accordingly, androgenic side effects such as virilization, hypertension, hair loss, etc. are possible. For this reason, we tend to advise women against using YK-11 or at least only in very low doses (maximum 4 mg per day) and with caution.

Experiences with YK-11

Experience reports have shown that YK 11 has enormous potential. During the so-called YK-11 Cycle, athletes were able to gain up to 2.5 kilograms of lean muscle mass while losing a full 3% of body fat. The results were achieved within four weeks. The consumer who achieved these values did not pay much attention to his diet. However, they were not athletes either.

Therefore, we asked our customers about their experiences with YK-11. Actually, all of them reported an enormously fast effect, which showed in massive muscle pumps and muscle fullness. Some consumers could notice that they became significantly more aggressive after taking 10 mg per day – which many were very supportive of in terms of training. Since it pays to spread the daily dose over 2 to 3 intakes, many used YK-11 supplements about 30 to 45 minutes before training to also benefit from the increased aggression.

Buy YK-11

There are always people who produce preparations in illegal laboratories or even at home, because the production of myostatin blockers like YK-11 is not allowed in some countries. If you want to buy YK-11, please pay close attention to the origin and manufacturer. In our web store for sports supplements and hardcore supplements you will find SARM supplements and YK-11 preparations exclusively in top quality and from reputable manufacturers.

BIO Molecule YK 11

BIO Molecule – YK 11

SARM with proven inhibition of myostatin levels for increased muscle strength and size and improved fat burning.


golden pharma YK 11

golden pharma YK 11

Extremely anabolic myostatin inhibitor to build fat-free muscle mass without water retention


Swiss Pharmaceuticals YK-11

Swiss Pharmaceuticals YK-11

YK-11 by Swiss Pharma is a SARM that has the ability as a myostatin blocker and is definitely one of the strongest SARMs on the market.
For dry muscle mass without water retention!


Brawn Nutrition YK-11

Brawn Nutrition YK-11

YK-11 has a stronger anabolic effect than testosterone and additionally acts as a myostatin inhibitor.
Potent myostatin inhibitor that activates the androgen receptors of muscle tissue and leads to muscle growth.


YK-11 in Germany: Is it legal?

Caution: We may and can not make any legally binding statements, but want to show you the legal situation known to us (as of April 2021) in the following. Please inform yourself before the purchase and consumption of YK-11 always about the respective legal situation in your country.

Here it depends on whether YK-11 is a SARM or a myostatin inhibitor. For both, the possession and use is subject to certain regulations in Germany. According to the Anti-Doping Act (AntiDopG §2 https://www.gesetze-im-internet.de/antidopg/BJNR221010015.html) and Doping Substances Quantity Ordinance (DmMV) https://www.gesetze-im-internet.de/dmmv_2023/BJNR0430B0023.html the following is allowed:

You are allowed to possess and consume YK-11 from legal sources in Germany in small quantities as an amateur athlete who does not want to gain a competitive advantage with it.

If YK-11 is classified as a SARM, the small amount is 90 mg. You are allowed to possess and use 450 mg of a myostatin inhibitor.

Myostatin inhibitors such as YK-11 in competitions.

Whether SARM or myostatin inhibitor, YK-11 is classified as doping relevant. The World Anti-Doping Agency (WADA) has included SARMs as “other anabolic substances” as well as myostatin inhibitors and myostatin function altering substances on its banned list since 1998. YK-11 is therefore banned in athletically organized competitions.

So please be careful: If you want to participate or already participate in competitions, then it is neither allowed to possess YK-11 nor to use it.

YK-11 Intake and Dosage

Since every body reacts differently to a particular substance, you should always start with the lowest dose and slowly increase. Basically, it is recommended that men take between 5 mg and 10 mg daily. Dosing above 15 mg is not advised. Women should take a maximum of 5 mg daily.

Field reports have shown that in men, taking 5 mg did not show much change yet. Taking 10 mg, on the other hand, showed rapid muscle growth. If you have not taken similar substances or SARMs before, you should start with a low dose so that the body can adjust to the supplement.

Since YK-11 has a very fast effect, this suggests a rather short half-life. You should therefore divide the daily doses. Many users take a portion about 30 to 45 minutes before training. Always pay attention to the dosage and intake exactly according to the manufacturer’s instructions.

If you have any questions about Myostatin Blocker YK-11 or other products, please contact us

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