MK-677 and Ostarine Stack

Description

The MK-677 and ostarine stack puts two of our most studied compounds in one order. One works on growth hormone through the ghrelin receptor, the other on the androgen receptor, so researchers can look at both pathways side by side.

Buy the MK-677 and ostarine stack online

You get two full bottles: liquid ibutamoren and liquid ostarine. 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 and ostarine 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. Ostarine (MK-2866) is the SARM with the most human trial data. It binds androgen receptors in muscle and bone with comparatively mild effects elsewhere.

The pairing makes sense because the two don’t compete. MK-677 raises growth hormone and IGF-1, while ostarine acts directly on androgen receptors in muscle and bone.

Research behind the MK-677 and ostarine stack

Both compounds have human data, which is rare in this category. Merck’s MK-677 trials ran up to two years in older adults, and GTx took ostarine through phase II and III studies. No published trial has tested the two together, so any combined protocol is new ground.

If you’re designing a study, you’ll want separate controls for each compound. Background reading for MK-677 is on PubMed, and the ostarine trials are listed under enobosarm.

MK-677 and ostarine stack specifications

• Contents: one bottle of liquid ibutamoren, one bottle of liquid ostarine
• MK-677 CAS: 159752-10-0
• Ostarine CAS: 841205-47-8
• MK-677 purity: 99.97% (COA 11/17/25)
• Ostarine purity: 98.04% (COA 07/08/25)
• 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 and ostarine stack comes from a batch tested by MZ Biolabs, an independent lab in Arizona. MK-677: 99.97% (COA 11/17/25). Ostarine: 98.04% (COA 07/08/25). Ask us for the full certificates and we’ll email them over.

MK-677 and ostarine stack FAQ

Why combine MK-677 and ostarine?

They act on different systems. MK-677 raises growth hormone and IGF-1, and ostarine binds androgen receptors.

Are the bottles the same as your single products?

Yes. Each one is the same liquid we sell on its own.

Can I swap one compound out?

Not inside this stack, but you can pick any bottles from our liquid SARMs range.

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 and ostarine 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 and ostarine stack to your cart, or build your own combination from our liquid SARMs.