Home / SARMS Powders / YK11




Myostine,(17-alpha,20E) 17
Molecular formula:
Molecular weight:
white powder
Delivery time:
10 working days
Minimum order:
Supply ability:
Negotiating price
  • Product Details

YK11, also known as Myostine, is considered one of the strongest SARMs on the market. In fact, it’s so strong and has comparable anabolic activity to steroids that it may actually be a synthetic steroid that was mislabeled a SARM in the first place.

How it works

As a relatively new compound, exactly how YK11 works to improve lean muscle mass in humans can only be discussed based on intial in vitro studies.

However, what we do know is that YK11 may be a Myostatin blocker – essentially allowing users to reap continuous gains without stalling and requiring a break in a cycle.

Myostatin is a protein that is released to limit muscle growth to ensure they do not get ‘too large’. It is found predominantly in skeletal muscle, and studies show that individuals with a gene mutation that limits Myostatin production are both stronger and more muscular than those with normal amounts.

YK11 may help to inhibit the production of Myostatin in muscles by attaching itself to the Androgen Receptor. From there, it may induce muscles to create more Follistatin, which in turn limits the levels of Myostatin, allowing increased muscle growth beyond genetic capability.

The confusion over whether Myostatin is a SARM or a steroid lies in the naming convetions (or lack thereof) in relation to newer compounds. Kanno, the original Japanese researcher, discovered that YK11 works via the androgen receptor, which is why he initially claimed it to be a SARM.

Newer research suggests that the backbone of YK11 is identical to those of steroids. In reality, we won’t know for sure until more studies are conducted.

Dosing Recommendations

User reviews suggest that the ideal human dosage for YK11 is 2-5mg twice per day for eight weeks (a total of 5-10mg per day for men).

Anecdotally, some users suggest increasing the dosage to 20mg per day in total over the course of a cycle, although it’s best to start at a lower dosage and find your sweet spot.


5-10mg total per day split into two doses.


0.5-2mg total per day split into two doses.


There have been quite a few anecdotal reports from users who have stacked YK11 with RAD140 with incredible results.

Users report increased strength and an increase in lean muscle mass similar to testosterone results but without the water bloat. It works great for users looking to bulk with lean, dry gains.


· RAD140 (Testolone) – 15-30mg

· YK11 (Myostine) – 5-10mg

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