For laboratory research use only. Not for human consumption. Sold by Explicit SARMs solely as reference material for in-vitro and animal research by qualified professionals. Not evaluated by the FDA and not intended to diagnose, treat, cure or prevent any disease.
Key facts: MK-777 Acetamoren Capsules
- Contents: 90 capsules per bottle, 10mg per capsule
- Testing: Our manufacturer tests it twice during production, and we use an independent third-party lab for purity testing.
- Shipping: US orders of $100 or more ship free, and orders placed before 2 PM ET, Monday to Friday, ship the same day.
- Price: $80.00 as of November 2026
- Related: For related SARM research, see Ostarine (MK-2866) capsules, Cardarine (GW-501516) capsules, RAD-140 (testolone) capsules.
For laboratory research use only.
What is MK-777?
MK-777 is the catalog name for acetamoren, CAS 950841-87-9. Registry listings give it the formula C29H38N4O6S and a molecular weight of about 570.7. Put that next to ibutamoren (MK-677, C27H36N4O5S, 528.7) and the gap is C2H2O, which is exactly one acetyl group. The free amine on ibutamoren’s 2-amino-2-methylpropanamide side chain is capped as an acetamide. The spiro-indoline-piperidine core and the benzyloxymethyl group are unchanged.
The parent compound is sold here too: MK-677 (ibutamoren) capsules, 90 x 10mg, and MK-677 liquid at 30mg/ml in a 30ml bottle.
This page lists MK 777 (also written MK777 or MK-777) from Explicit SARMs: acetamoren capsules, 90 x 10mg per bottle. Our MK-777 research article covers what is and isn’t published about it.
So MK-777 is an analog of MK-677. It is not the same molecule, and nobody has published data showing it behaves the same way.
Is MK-777 a SARM?
No. You will see it listed as “MK777 SARMs” across a lot of catalogs, but the label is wrong. SARMs bind the androgen receptor. Ibutamoren, the parent structure, is a ghrelin-receptor (GHS-R1a) agonist and has no androgen-receptor activity. Any activity acetamoren has would be expected at the ghrelin receptor, if anywhere. That is a hypothesis based on structure, not a measured result.
What the literature says (and doesn’t)
As of October 2026, PubMed returns zero records for “MK-777”, “MK777”, “acetamoren” or the CAS number, and ClinicalTrials.gov lists no studies. There is also no Merck publication or patent under the MK-777 code. The “MK” prefix is Merck’s, and MK-0677 is a real Merck designation, but MK-777 appears to be a commercial name. Anyone who tells you what MK-777 “does” is extrapolating from ibutamoren.
For researchers, that gap is the point. Open questions include receptor binding affinity relative to ibutamoren, whether the acetamide is hydrolyzed back to ibutamoren in vitro or in vivo, and basic stability. We cover what is known in more depth in MK-777 (Acetamoren): Chemical Identity and the Evidence Gap, and the parent compound in MK-677 (Ibutamoren) Research Review.
Specifications
- Compound: acetamoren (sold as MK-777)
- CAS: 950841-87-9
- Formula / MW: C29H38N4O6S / approx. 570.7
- Format: 90 capsules, 10mg per capsule
- Classification: research chemical, not a SARM
Sourcing, testing and COA
Our MK-777 comes from US domestic manufacturing partners. Our manufacturer tests it twice during production, and we use an independent third-party lab for purity testing. Because there is no published reference profile for acetamoren, the COA matters more here than it does for a well-characterized compound. Look for identity confirmed by mass against the expected ~570.7, and ideally a check for residual ibutamoren.
FAQ
What is MK-777?
Acetamoren, CAS 950841-87-9, the N-acetyl analog of ibutamoren (MK-677).
How much does MK-777 cost, and where can I buy it?
As of November 2026, MK-777 (acetamoren) from Explicit SARMs costs $80 for a bottle of 90 capsules at 10mg each, and you can order directly on this page. US orders of $100 or more ship free, and orders placed before 2 PM ET, Monday to Friday, ship the same day. Sold for laboratory research use only.
Is MK-777 the same as MK-677?
No. They share a scaffold but differ by an acetyl group, with different formulas and molecular weights. Whether their pharmacology matches has not been tested in published work.
Are there published MK-777 studies?
None that we can find on PubMed or ClinicalTrials.gov as of October 2026.
Is MK-777 on the WADA list?
Not by name. WADA section S2.2.4 prohibits growth hormone secretagogues as a class, which would likely cover a compound marketed as a GHS-R1a agonist.
Can I get a COA?
Published COAs are not listed for this product; see the Learn More guide for research background.
Who tests MK-777?
Our manufacturer tests MK-777 twice during production, and we use an independent third-party lab for purity testing.
What payment methods does Explicit SARMs accept?
We accept debit and credit cards, Zelle, Cash App, and ACH bank transfer.
Does Explicit SARMs ship internationally?
Yes. We ship within the United States, to Canada, and to other countries where local regulations allow the product. Available destinations and shipping options are shown at checkout.
For laboratory research use only. Not for human consumption. Sold by Explicit SARMs solely as reference material for in-vitro and animal research by qualified professionals. Not evaluated by the FDA and not intended to diagnose, treat, cure or prevent any disease.
