Description
The MK-677 YK-11 and LGD-4033 stack is our strongest three-bottle set. It combines a high-affinity SARM, a steroidal partial agonist and a growth hormone secretagogue.
Buy the MK-677 YK-11 and LGD-4033 stack online
You get three full bottles: liquid ibutamoren, liquid YK-11 and liquid ligandrol. Buying them as a stack costs less than ordering each bottle on its own, and everything ships together in one package. Each bottle is filled from a batch with its own certificate of analysis, and each one has its own pipette, so there’s no cross-contamination between compounds. Browse more combinations in our SARMs stacks category.
What’s in the MK-677 YK-11 and LGD-4033 stack?
Ibutamoren (MK-677) is an oral growth hormone secretagogue. It acts on the ghrelin receptor and raises growth hormone and IGF-1 without touching the androgen receptor. YK-11 is a steroidal partial androgen receptor agonist. In muscle cells it raises follistatin, which in turn blocks myostatin. LGD-4033 (ligandrol) binds the androgen receptor at around 1 nM, one of the highest affinities of any SARM, and has phase I and II human data.
LGD-4033 and YK-11 both act on the androgen receptor, YK-11 partly through follistatin. MK-677 works on growth hormone release through the ghrelin receptor.
Research behind the MK-677 YK-11 and LGD-4033 stack
This is a lot of androgen receptor activity in one protocol, so expect suppression and plan for it. LGD-4033 has human trial data, MK-677 has years of Merck studies and YK-11 has mostly cell data.
Read each compound’s literature separately before you combine them. MK-677 studies are on PubMed.
MK-677 YK-11 and LGD-4033 stack specifications
- Contents: one bottle of liquid ibutamoren, one bottle of liquid YK-11, one bottle of liquid ligandrol
- MK-677 CAS: 159752-10-0
- YK-11 CAS: 1370003-76-1
- LGD-4033 CAS: 1165910-22-4
- MK-677 purity: 99.97% (COA 11/17/25)
- YK-11 purity: 98.76% (COA 09/03/25)
- LGD-4033 purity: 99.74% (COA 10/26/25)
- Carrier: USP-grade PEG-400
- Packaging: UV-resistant glass bottles, graduated 1 mL glass pipettes, tamper-proof seals
Measuring and storage
Each compound comes in its own glass bottle with a graduated 1 mL glass pipette, so you can measure each one separately and keep your records clean. Label your draws by bottle, because the solutions look alike.
Store all the bottles upright, tightly capped and away from heat and direct sunlight. Room temperature is fine for PEG-400 solutions.
Lab testing and certificate of analysis
Each bottle in the MK-677 YK-11 and LGD-4033 stack comes from a batch tested by MZ Biolabs, an independent lab in Arizona. MK-677: 99.97% (COA 11/17/25). YK-11: 98.76% (COA 09/03/25). LGD-4033: 99.74% (COA 10/26/25). Ask us for the full certificates and we’ll email them over.
MK-677 YK-11 and LGD-4033 stack FAQ
Who is this stack for?
Labs comparing several anabolic pathways at once: androgen receptor, follistatin and growth hormone.
Is it suppressive?
Very likely, because two of the three compounds act on the androgen receptor.
What concentrations are included?
MK-677 at 25 mg/mL, YK-11 at 10 mg/mL and LGD-4033 at 10 mg/mL.
Why researchers buy from Sports Technology Labs
A 2017 JAMA study bought 44 products sold online as SARMs and tested them. Only 52% contained a SARM at all, and 39% contained other unapproved drugs. That’s the problem we set out to fix. We start with raw material that’s at least 98% pure, bottle everything in the USA and send every batch to MZ Biolabs before it goes on sale. Liquids go into glass bottles with glass droppers, so there’s no plastic in contact with the solution.
Shipping, returns and support
Orders over $149 ship free inside the US, and express shipping is there at checkout if you’re short on time. Everything we sell is covered by a 60-day money-back guarantee. Questions about a batch, a COA or an order? Email us and a real person will answer.
For laboratory research use only
The MK-677 YK-11 and LGD-4033 stack is sold for laboratory research only. It isn’t a dietary supplement, it isn’t approved by the FDA, and it isn’t for human or veterinary use. We’re a chemical supplier, not a medical provider, and nothing on this page is medical advice. Please don’t buy it for personal use or sports.
Add the MK-677 YK-11 and LGD-4033 stack to your cart, or build your own combination from our liquid SARMs.
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