YK-11
(17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylic acid methyl ester. Selective Androgen Receptor Modulator (SARM) / Myostatin Inhibitor, steroidal sarm.
This page describes what YK-11 is and its known risks. It is not medical advice and not a guide to using it. Many of these substances are prescription-only or illegal to use without a prescription. Speak to a doctor.
- Class
- Selective Androgen Receptor Modulator (SARM) / Myostatin Inhibitor
- Legal status
- Research chemical (not approved for human use)
- Half-life
- 6-10 hours
- Liver strain
- Moderate-High
- Kidney strain
- Unknown
- Converts to estrogen
- Unknown
- Suppresses natural hormones
- Yes
Medical uses
- None
What it does in the body
Anabolic
- Muscle growth (via myostatin inhibition)
- Strength increase
- Increased follistatin (myostatin inhibitor)
- Bone density increase
Forms, half-life and detection
| Form | Half-life | Reported detection window |
|---|---|---|
| Oral (liquid or capsules) | 6-10 hours | Unknown |
Side effects and health risks
Hormones and fertility
- Testosterone suppression (significant)
- Unknown long-term effects
Liver
- Elevated liver enzymes (steroidal structure)
Androgenic
- Acne
- Hair loss (possible)
Other
- Aggression
- Joint pain
Blood tests worth monitoring
From its known properties, these are the markers doctors commonly check. Getting blood work before, during and after is how problems are caught early.
- Androgens tend to lower HDL, raise LDL and thicken the blood: HDL Cholesterol, LDL Cholesterol, Hematocrit, Hemoglobin
- Liver strain: Moderate-High: ALT (SGPT), AST (SGOT), GGT, Bilirubin
- Shuts down natural production (PCT needed): Total Testosterone, LH, FSH
Questions
What is the half-life of YK-11?
About 6-10 hours. Half-life is the time for the level in the blood to fall by half.
How long is YK-11 detectable?
Testing windows of Unknown are reported, depending on the test and the person.
Is YK-11 legal?
Research chemical (not approved for human use). Laws differ by country and change; check the rules where you live.
What blood tests matter with YK-11?
Based on its properties, these markers are commonly monitored: HDL Cholesterol, LDL Cholesterol, Hematocrit, Hemoglobin, ALT (SGPT), AST (SGOT), GGT, Bilirubin, Total Testosterone, LH and FSH. A doctor can order and interpret them.
What are the side effects of YK-11?
Hormones and fertility: testosterone suppression (significant) and unknown long-term effects. Liver: elevated liver enzymes (steroidal structure). Androgenic: acne and hair loss (possible).
For information only, not medical advice. MyoStats is a tracking tool used at your own discretion. Speak to a doctor before changing your training, diet, medication or anything you take.