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Raw YK-11 powder (431579-34-9)

YK-11 powder belongs to the group of selective androgen receptor modulators (SARMs). Basically, what YK11 does is selectively ……

Status: In Mass Production
Unit: 25kg/Drum
Capacity: 1470kg/month


Raw YK-11 powder (431579-34-9) video


Raw YK-11 powder (431579-34-9) Description

YK11, also known as Myostine, is considered one of the strongest SARMs on the market. It is a synthetic steroidal selective androgen receptor modulator. The drug has anabolic activity in vitro in C2C12 myoblasts and shows greater potency than dihydrotestosterone (DHT) in this regard. YK11 also is a Myostatin inhibitor. they can help you to gain muscle and lose fat.

Raw YK-11 powder (431579-34-9) Specifications

Product Name Raw YK-11 powder
Chemical Name YK11,(17a,20E)-17,20-[(1-Methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna- 4,20-diene-21-carboxylic Acid Methyl Ester;YK11 ((17α,20E)-17,20-[(1-methoxyethylidene)bis-(oxy)]-3-oxo-;DNA (Terrabacter strain YK11 16S rRNA gene fragment);GenBank AB070463
Brand Name No data for available
Drug Class SARMs
CAS Number 431579-34-9
Molecular Formula C25H34O6
Molecular Weight 430.53386
Monoisotopic Mass 430.236 g/mol
Melting Point  190-200°C
Freezing Point No data for available
Biological Half-Life 6-10 hours, depending on individual
Color White solid
Solubility  Propylene Glycol, DMSO, Ethanol
Storage Temperature  Room temperature
Raw YK-11 powder Application Selective Androgen Receptor Modulator, Myostatin Inhibitor


Raw Raw YK-11 powder (431579-34-9) Description

Many users think YK11 is the key to unlocking the body’s full potential and achieving fast muscle gains with few side effects. YK11 appears to be a super-SARM based on the reviews, while in reality, this drug is NOT a typical SARM. This article breaks down the science and reviews to give you a clear idea of what to expect from this SARM-steroid hybrid, with risks and side effects.

It also said that YK11 has the ability to reduce myostatin activity, making it a myostatin inhibitor. The YK-11 sarm is definitely one of the strongest ones out there. You can’t really compare YK to LGD-4033 or any other SARM because of how strong it is.

However, even though YK-11 raw powder is incredibly strong keep in mind that there have been only a few studies done with this compound. This is the main reason most people seem to rather go with a SARM such as Ostamuscle, RAD-140 or GW-501516.

YK11 is gaining interest from bodybuilders due to its ability to quickly build muscle with minimal side effects, much like various SARMs. The structure of YK11 is unique. The YK molecule shares more in common with steroids than SARMs, although it’s often mistakenly placed in the same bucket as all other non-steroidal SARM.

One cellular study suggests that YK11 increases muscle mass. Researchers found that it increases the muscle-building protein follistatin (a myostatin inhibitor).

YK11 may also enhance bone health. In a study on bone cells, YK11 increased the levels of bone-building proteins.

Some bodybuilders who have experimented with YK11 report great muscle gains and fat loss with minimal side effects. However, there are currently no animal or human studies of YK11 and its safety is unclear.

Raw YK-11 powder (431579-34-9) Mechanism of Action

YK11 has a similar chemical structure to DHT and this is shown by the way it binds to androgen receptors. The body produces DHT naturally for the purpose of promoting prostate health, hair growth, and appropriate puberty development.

If we were to class YK11 as a SARM then it would be the strongest and most potent of its kind on the market. That’s because it only activates androgen receptors partially, which causes catabolic androgenic activity to shoot through the roof. In addition, YK11 is known as a myostatin inhibitor.

Researchers did a cell study to find out how it works to build muscle. The results show that it simply aims to increase follistatin levels. Follistatin is another naturally occurring protein in the human body which helps keep myostatin in check. Myostatin is a hormone whose job is to curtail unbridled muscle growth.

So far, only YK11 raw powder has the ability to inhibit myostatin.

Further evidence suggests that YK11 can also promote bone growth by interfering with a gateway that functions like DHT.

Benefits of Raw YK11 powder (431579-34-9)

◆ Increases Muscle Size

While YK11 is not a SARM per se, it has an incredible ability to stimulate muscle growth. It’s said to be as strong as S23.

That’s because it naturally increases follistatin levels which in turn enhances your body’s ability to produce muscle cells. Follistatin is also responsible for suppressing myostatin, thus opening you up to the possibility of limitless muscle growth. But if follistatin effects are inhibited in any way, then myostatin inhibition cannot happen, which would render YK11 ineffective.

Not to sound like a broken record but there are no human or animal studies to back the data on this compound.

All we have is anecdotal evidence based on bodybuilder reviews on online forums. What they tell us is that they’ve been able to experience significant fat reduction and 15 lbs worth of lean muscle gains in a short amount of time.

◆ Strengthens Bones

Sex hormones are essential for maintaining strong and healthy bones. Available evidence shows that YK11 raw powder may increase bone strength by binding itself to androgen receptors, which is similar to what most SARMs do.

YK11 can also increase the amount of activated PKB (protein kinase B) present in the body’s cells which facilitates the growth of bone cells.

Let’s not forget that you want to have strong, healthy muscles and bones to avoid fractures. It may be able to assist in this regard as well because it’s very effective at building muscle, supporting bone health and mitigating the effects of bone fragility.

Recommended Raw YK-11 powder (431579-34-9) Dosage

Bodybuilders who’ve used YK11 raw powder say that taking it in dosages of 10 to 15 mg per day works just fine for them. Others have reported positive effects on 5 mg per day. Most users cycle it for 4 to 8 weeks. You’ll also find users that stack different SARMs together.

Side effects of Raw YK-11 powder (431579-34-9)

▲So far, only cellular studies have been conducted on YK11.

There’s no clinical evidence or even animal studies to back any of the claims that are being made about the drug.

This should make you think twice about researching with this compound. Perhaps you should check out different compounds such as Ostarine and Ligandrol. They have a lot more information and research available.

It is said that YK11 can be toxic to the liver. Hypothetically speaking, it may affect hair growth, vocal cord, prostate health and other important organs in the body.



This Material is Sold For Research Use Only. Terms of Sale Apply. Not for Human Consumption, nor Medical, Veterinary, or Household Uses.


References & product citations

YK-11 Cycle and Experience Feedback from Real Users



  1. Thevis, M., Piper, T., Dib, J., Lagojda, A., Kühne, D., Packschies, L., … & Schänzer, W. (2017). Mass spectrometric characterization of the selective androgen receptor modulator (SARM) YK‐11 for doping control purposes. Rapid Communications in Mass Spectrometry31(14), 1175-1183.
  2. Kanno, Y., Ota, R., Someya, K., Kusakabe, T., Kato, K., & Inouye, Y. (2013). Selective androgen receptor modulator, YK11, regulates myogenic differentiation of C2C12 myoblasts by follistatin expression. Biological and Pharmaceutical Bulletin36(9), 1460-1465.
  3. Piper, T., Dib, J., Putz, M., Fusshöller, G., Pop, V., Lagojda, A., … & Thevis, M. (2018). Studies on the in vivo metabolism of the SARM Y1K11: Identification and characterization of metabolites potentially useful for doping controls. Drug testing and analysis10(11-12), 1646-1656.