YK11 Dosage: What Users Report and What Is Known

Short answer: there is no researched YK11 dosage. YK11 has never been given to people in a clinical study, so no dose has been tested for effect or safety. The doses users commonly report are 5–15 mg a day for 4–8 weeks, usually followed by a SERM such as Clomid because they expect testosterone suppression. Those numbers are anecdotal.

This page sets out what is known, what users report for bulking and cutting, and what has never been measured. The original author’s experience is in YK11 before and after results.

YK11 Summary

YK11 is a synthetic steroid that behaves like a SARM: in cell tests it was a partial agonist of the androgen receptor (Kanno 2011). In mouse muscle cells it raised follistatin, a protein that blocks myostatin, and that is the basis for calling it a “myostatin inhibitor” (Kanno 2013). That effect has only been shown in cells.

More in our YK11 review; compounds with human dosing data are compared in the SARMs database.

YK11 Half-Life

The half-life of YK11 is not established. No pharmacokinetic study has been published in humans or animals. In an elimination study run for doping control, no intact YK11 appeared in urine at all; unconjugated breakdown products were gone within 24 hours, while conjugated ones were traceable for more than 48 hours (Piper 2018).

YK11 Bulking Dosage + Example Cycle

Evidence level: anecdotal. No YK11 dose has been tested in a human study, so every number in this section comes from user reports, not research. It describes what people say they took; it is not a recommendation.

For a bulk, users most often report 10–15 mg a day for about 8 weeks, eating above maintenance, followed by a few weeks of Clomid. This pattern appeared in most of the reader reports on our before and after page:

Users run a SERM afterwards because they expect their own testosterone to be suppressed; with YK11 that has never been measured. For what studies show about clomiphene itself, see Clomid PCT.

YK11 Cutting Dosage + Example Cycle

Evidence level: anecdotal. No YK11 dose has been tested in a human study, so every number in this section comes from user reports, not research. It describes what people say they took; it is not a recommendation.

On a cut, users typically report a lower 5–10 mg a day for 6–8 weeks, again followed by Clomid. Claims of gaining 2–3 lb of lean mass during a cut come from user reports only.

Many cutting stacks pair YK11 with cardarine; read YK11 stacks for what is known about each part.

No PCT YK11 Dosage?

There is no known “no-PCT” dose of YK11, because nobody has measured what any dose does to testosterone, LH or FSH. Some users try 5 mg a day or less to avoid PCT and still report symptoms of low testosterone afterwards; that is anecdotal too.

For comparison, a SARM that has been tested, LGD-4033:

The only way to know where you stand is bloodwork before and after; the PCT and bloodwork planner lists the markers.

Safest YK11 Dosage

What is reasonable to say: lower doses and shorter use expose you to less of an unknown drug, and bloodwork is the only way to see suppression, cholesterol or liver changes. Liver injury has been reported with several SARMs in healthy adults (Vignali 2023); see are SARMs liver toxic.

Product quality matters as much as the number on the label: if the capsule does not contain what it says, the dose is meaningless. If you buy, choose a shop that publishes a third-party lab report for each batch; our current pick is explained in the SwissChems review.

What YK11 Dosage Should I Take

We can’t give you a YK11 dose, and nobody can give you a researched one. Users commonly describe starting at 5 mg a day and staying at or under 15 mg; that is the range in the reports above, not a tested range.

A few practical points that don’t depend on YK11 research:

• Liquids: the dose depends on the concentration printed on the bottle. At 10 mg per ml, 0.5 ml contains 5 mg and 1 ml contains 10 mg. Check the label rather than assuming.
• Injectable YK11: no injectable form has been studied at all.
• Women: there are no YK11 data for women at all.
• Compare first: if your goal is muscle, the database shows which compounds have human trials, and YK11 vs LGD-4033 puts the two side by side.

How YK11 doses compare with tested SARMs

The SARMs that have been in human trials were dosed very differently from each other, which is why a number cannot be borrowed from one compound for another:

The 5–15 mg a day users report for YK11 is therefore not anchored to any trial. Dosing pages for compounds with human data: LGD-4033 dosage, Ostarine dosage and the RAD-140 dosage guide.

Conclusion

Every YK11 dosage you will read, including the bulking and cutting numbers on this page, comes from user reports. YK11 has never been tested in humans, its half-life and effect on testosterone are unknown, and the only safety data come from rats. If you still look at YK11, treat 5–15 mg a day as what people report rather than what is proven, get bloodwork before and after, and know what is actually in the product.