YK11 SARM Reviews: Results, Dosage & Side Effects

Bodybuilders are always on the lookout for effective performance-enhancing compounds to put on more muscle mass.

There has been a lot of attention focused on SARMs (Selective Androgen Receptor Modulators) as a safer alternative to anabolic steroids.

Since they target specific androgen receptors on the muscles, they tend to have a similar effect as testosterone, with none of the unwanted side effects.

As especially the most excellent SARMs stacks become more popular, they are being heavily scrutinized by anti-doping agencies.

If you're looking for something that gives similar effects with even fewer side effects than SARMs, why look into this YK11 review?

This compound claims to have the same effect on muscle growth, without the need to cycle or endure the side effects associated with SARMs.

In this guide, we will summarize this claim along with the YK11 reviews online.

What is the YK11 SARM?

Yk-11 SARM chemical structure

YK-11 is a very tricky compound to understand.

There is a lot of confusion about whether it is a steroid, or whether it is a SARM.

The answer to both questions is: yes. YK-11 is a SARM. It is also derived from DHT, a potent steroid, so technically, it's a steroid as well.

Despite that you may find it's frequently being called a SARM, YK11 doesn't function in the same way as most SARMs.

SARMs work by binding to androgen receptors and activating muscle-building pathways in the body.

Unlike steroids, which also target sex organs, SARMs only target skeletal muscle tissue, promoting muscle growth and retention [R].

Many preliminary studies have shown that SARMs are effective against fighting osteoporosis as well as frailty in cancer patients.

YK-11 doesn't function in the same way as Andarine S4 for example or most SARMs for that matter. It uniquely works as a myostatin inhibitor.

Myostatin is a compound produced in the body that stops muscle cell growth and differentiation.

Animals and people with a deficiency can put on much more muscle than normal since their muscle cells never stop growing.

How Does YK11 Work?

It works by preventing myostatin from performing its function, which in turn promotes muscle cell growth and differentiation.

YK11 does this by increasing follistatin expression in the body. Follistatin inhibits the function of myostatin. So by taking it, you increase your follistatin levels, which stops it from working.

When this doesn't work, your cells have more time to grow and divide. This maximizes the bulking up you experience from your training.

The reason why this is still considered a SARM according to almost every YK11 review is that it binds selectively to androgen receptors.

However, the function of this one is very different from that of other, traditional, SARMs.

Unlike the typical non-steroidal SARM, it has a similar chemical structure as DHT (dihydrotestosterone).

DHT is known as a very strong androgen receptor agonist and is essential for proper development during puberty, hair growth, as well as prostate health.

Despite the promising ways it impacts muscle mass and growth, there are very few studies on YK-11 available.

The only reputable studies on YK-11 are published in an issue of the peer-reviewed Biological and Pharmaceutical Bulletin (Biol Pharm Bull).

How Effective is YK11?

YK-11 is considered one of the most powerful anabolic compounds available because it inhibits myostatin, allowing muscles to grow beyond their ordinary limits.

It also promotes muscle growth and bone growth in a way similar to DHT.

This double-effect can explain the extreme muscle-mass-gaining effects it has, making it one of top choices for a SARMs bulking stack.

Benefits & Expected Results

YK11 has several benefits, similar to other SARMs. Users quickly notice an increase in physical strength and a shorter recovery period. The shorter recovery period allows you to work harder and longer in the gym, which translates into increased lean muscle mass growth.

Some people and related posts also report good fat-loss benefits from using YK-11, though this is generally in combination with another SARM, such as Ostarine. A fringe benefit of it is that it doesn't promote water retention, which will give you a lean look without having to go through the pain of reducing your water weight.

Preliminary studies show that it also affects bone density. YK-11 increases the amount of protein kinase B in mc3t3-e1 cells, according to a paper published in Biol Pharm Bull [R]. Increased PKB leads to increased bone cell production. While better bone density isn't why you take YK11, it's a nice side effect on top of the muscle growth and strength gains you'll see.

To date, there have been no formal human or animal studies done on its effects on the body. Studies of the compound have taken place in cell models and the findings published in Biological and Pharmaceutical Bulletin. The compound was developed as a synthetic form of DHT for use in the lab, and its effects in the gym haven't been studied at all.

This lack of evidence hasn't stopped bodybuilders from trying it out and successfully using YK11 to rapidly put on lean muscle mass. (Even though bodybuilders tend to love experimenting with new compounds and seeing what results they provide.) Anecdotal evidence shows that it performs better than most SARMs in terms of muscle gain and fat loss.


Anecdotal evidence suggests that the minimum recommended YK11 dosage is 5 mg per day.

The average dosage is between 10 mg and 15 mg per day.

As with most compounds, it's a good idea to start with a lower dosage when using this SARM and only increase if you don't see good results.

The general recommended YK11 cycle is six to eight weeks, with up to eight weeks off. Some users have reported signs of testosterone suppression after eight weeks of using it, so it's important to cycle off the drug and restore your body's normal testosterone levels.

You can either use a PCT for SARMs or other testosterone booster or cycle off it completely for an extended time.

Since there is no clinical data available on the recommended dosage and YK11 cycle length, we strongly advise erring on the side of caution. Start with a low dose of 5 mg and keep your cycle short. If possible, check your testosterone levels after the cycle. If your testosterone isn't dramatically affected, you can up the dose while keeping the cycle length the same.

The best way to prevent testosterone suppression is to keep your cycles short and check how you're feeling. There's no shame in cutting a cycle short because you feel lousy, no matter what your gym buddies say.

Side Effects

The clinical effects of the selective androgen receptor modulator YK-11 haven't been studied, so it's impossible to definitively say what the side effects are. Most research on it has pertained to mouse mc3t3-e1 cells. These cell studies (such as the study in Biol Pharm Bull) mark the extent of the research performed so far, making it difficult to evaluate the overall YK11 side effects in the human body.

Anecdotal evidence suggests that testosterone suppression may be a side effect. As with many other untested research chemicals, it's best to assume the worst and prepare for severe side effects. At the very least, be alert for any issues that might crop up. Chances are, if you take too much, or take it for too long, your body will give you signals, indicating it is time to lay off.

As YK-11 is similar in function to a SARM, and similar in structure to dihydrotestosterone, keep an eye out for side-effects known to happen due to these compounds. These can include enlarged breasts, increased aggression, a negative effect on prostate health, and excessive hair growth.

Where to Buy YK11 Online?

If you've decided you'd like to give YK11 a try, you should be aware that it's considered a research chemical and hasn't been evaluated by the FDA for quality, safety, or efficacy. Many disreputable vendors will pretend to sell you the real thing and sell you something else instead.

You should always make sure that you're buying from a reputable vendor such as Science.bio. This company has a proven history of selling high-quality products for bodybuilders and weightlifters at reasonable prices.

Frequently Asked Questions (FAQ)

Your questions answered:

Is YK11 a Steroid?

It's derived from dihydrotestosterone, a well-known steroid. While it shares a similar chemical structure, it doesn't appear to function in the same way as a steroid. Whether or not you want to call it a steroid will depend on whether you're evaluating it based on form or function.

Will YK11 Show Up on a Drug Test?

Yes, for up to two days after use. It is considered a banned substance, either as a SARM or as a synthetic steroid.

Does YK11 Cause Gyno?

There is no published evidence that it does, but anecdotal evidence suggests that prolonged use can result in gynecomastia.

What's the Half-Life of YK11?

According to articles published in the peer-reviewed journal Biol Pharm Bull, the half-life of it is between six to 10 hours. Such a short half-life means that you should consider taking it twice a day if you're looking to build muscle mass.


We've all heard about (or seen) the results of SARMs before and after taking them. We've seen the ads put out by suppliers.

YK11 is considered one of the most potent and effective compounds to build muscle mass, increase endurance, and burn fat.

However, we do recommend taking it with caution. This compound has only been studied in mouse cell lines, so it's difficult to know how safe or effective it is.

Currently, it's impossible to tell what the dose is supposed to be and what kind of side effects you can expect other than muscle gains.

There are many other well-documented muscle growth enhancers on the market, and we strongly recommend checking them out before turning to this relatively untested product.