Ostarine (MK-2866)
Muscle Preservation SARM
€55.00
What’s Included
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60 capsules per bottle -
10mg pure MK2866 per capsule
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2-month supply (1 cap daily)
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Third-party lab certificate included
Lab Tested
Third-party verified
Fast Shipping
3-7 business days
24/7 Support
Expert guidance
Product details
Ostarine (MK-2866) is one of the most extensively researched selective androgen receptor modulators, attracting significant scientific interest for its interaction with muscle tissue and body composition. Its broad research profile has made it a well-known compound among both new and experienced researchers.
At CORE SARMS, we offer you premium-quality Ostarine, rigorously tested for purity and potency at third-party laboratories. Each capsule in this product contains 10 mg of 99%+ purity MK-2866.
Multi-Purpose SARM
One of the defining characteristics of Ostarine MK-2866 is its versatility. Unlike many SARMs that are primarily researched for a single purpose, MK-2866 has been investigated across a wide range of applications involving lean muscle, body composition, and recovery-related pathways.
Active Ingredients
Purity & Quality
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Third-party lab tested -
99.7%+ purity guaranteed -
24-month shelf life
Ostarine (MK-2866) has been studied for its selective interaction with androgen receptors located primarily in muscle and bone tissue. Because of this tissue-selective activity, it has become a common subject of research into anabolic signaling and muscle maintenance.
Scientific investigations have explored MK-2866 for its potential role in protein metabolism and pathways associated with preserving lean muscle, particularly in studies involving calorie restriction or physically demanding conditions. Its relatively mild pharmacological profile has contributed to its popularity in long-term research settings.
Ostarine MK-2866 may provide sustained receptor activity, mainly due to its half-life of 24 hours.
Key Actions
Muscle Preservation During a Cut
During a cut, Ostarine’s anti-catabolic properties are its standout quality. Even at modest doses, users maintain muscle mass and strength that would otherwise be lost during aggressive caloric restriction.
This effect is well-established in the clinical literature. A Phase 2 trial published in The Lancet Oncology reported statistically significant preservation of lean body mass in cancer patients with muscle wasting compared with placebo. [1]
Lean Bulking
For lean bulking, Ostarine produces gradual, high-quality gains without the bloat associated with wet compounds. Gains are typically slower than those seen with RAD-140 or LGD-4033, but cleaner and more sustainable.
Key advantages for lean bulking:
- Minimal water retention.
- No aromatisation to oestrogen.
- Suitable for longer cycles due to a mild side-effect profile.
- Consistent anabolic support with a 24-hour half-life.
Joint and Connective Tissue Effects
Ostarine also has documented effects on bone and connective tissue. Preclinical research in an ovariectomised rat model found that Ostarine maintained bone mineral density and increased bone strength at intermediate and higher doses. [2]
Users frequently report reduced joint discomfort during training, particularly at the knee and shoulder. This is consistent with its receptor activity in bone and connective tissue.
Side effects at standard doses are mild. Temporary testosterone suppression is the most commonly reported variable on longer cycles. All CORE SARMS Ostarine is third-party tested to 99.7%+ purity. Sold strictly for research purposes.
Ostarine is often the first compound people try, since it performs reliably across bulking, cutting, and recovery goals alike. New to this? Start with our SARMs for Beginners: What to Know Before Your First Cycle.
Real results from real customers
Transformations from verified customers. Individual results vary.
Reviews
Rated 4.9 by verified UK buyers.
What are the Key Benefits of Ostarine (MK-2866)?
Muscle preservation
Lean gains
Enhanced recovery
Joint health support
Improved strength
Body recomposition
How to Use Ostarine (MK-2866)?
Dosage
10mg once daily
Timing
Take with morning meal
Cycle Length
8-12 weeks followed by 4-week break
Important
Dietary supplement use only
Very well tolerated. Can be used for cutting or lean bulking phases.
Training
Fits full-body routines or a standard split. Consistency in sets and progression matters more than the program you pick.
Diet
Eat at maintenance, a small surplus, or a small deficit, depending on your goal. Ostarine is the easiest compound to pair with flexible eating.
Stacking and cycle guidance
Ostarine is versatile enough to suit a range of goals, from bulking to cutting. Pick a single companion below to stack with Ostarine and save 5%, or choose a complete bundle further down for a bigger discount:
Cardarine (GW-501516) + Ostarine (MK-2866)
Recomposition: Cardarine's fat-burning support pairs with Ostarine's muscle-preserving effect for a clean recomp.
€104.50 €110.00 Save 5%
Ostarine 15-20mg each morning. Cardarine 5-10mg, 1-2 hours before training. Run together for 8 weeks. PCT optional depending on Ostarine dose.
Ibutamoren (MK-677) + Ostarine (MK-2866)
Recomposition: Ostarine's lean muscle-and-fat-loss profile pairs well with MK-677's round-the-clock support.
€105.45 €111.00 Save 5%
Ostarine 15-20mg each morning. MK-677 10-25mg, 30-60 minutes before bed. Run together for 8-12 weeks. PCT optional for the Ostarine portion depending on dose.
S-23 (SARM) + Ostarine (MK-2866)
Cutting insurance: S-23's potent cutting effect pairs with Ostarine's muscle retention for extra insurance during a deficit.
€95.00 €100.00 Save 5%
Ostarine 15-20mg + S-23 10-20mg, both once daily each morning. Run together for 6-8 weeks. PCT mandatory for the S-23 portion.
Complete Bundles
Prefer a full protocol in one order? These pre-built bundles pair Ostarine (MK-2866) with 3-4 companions at a bigger combined discount:
Muscle Building Bundle
Complete stack: RAD-140, LGD-4033, Ostarine, and MK-677 bundled for less than buying each on its own.
€195.00 €225.00 Save 13%
LGD-4033 10-20mg, RAD-140 20mg, and Ostarine 20mg together each morning; MK-677 20mg before bed. Run for 8 weeks, never longer than 10. PCT required after.
Cutting Bundle
Complete stack: RAD-140, Ostarine, and Cardarine bundled into a complete cutting protocol, priced below buying each alone.
€150.00 €170.00 Save 12%
RAD-140 and Ostarine (10mg each) together each morning; Cardarine 10mg 1-2 hours before training. 6-8 weeks max. PCT required for the RAD-140 portion.
The CORE SARMS Handbook walks through dosing, cycle length, and stacking logic for every compound on this page.
Read the CORE SARMs Handbook →Post-cycle support
Frequently Asked Questions
Ostarine (MK-2866) is a selective androgen receptor modulator (SARM) that has been extensively researched for its interaction with muscle and bone tissue. It is widely recognized for its tissue-selective mechanism and has attracted significant scientific interest in studies involving lean muscle maintenance, body composition, and anabolic signaling.
Ostarine MK-2866 is associated with milder potency (and side effects) than other SARMs, making it a popular option among athletes with less supplementation experience.
The most common results associated with Ostarine are: lean muscle gains, improved recovery, maintained strength during the cutting phase, and general body recomposition.
Yes, Ostarine may potentially cause mild fatigue, mood changes, and/or temporary hormonal shifts. The side effects are individual: some users report a few of them, while others may not experience any of the above.
Ostarine has a half-life of 24 hours. This is the time during which it remains active. The time to fully remove this compound from your body will be significantly longer. Remember that the exact times depend on numerous variables, like the dosage or your general metabolism.
Ostarine is not a steroid. Like steroids, it affects androgen receptors, mimicking the effect of steroids. However, as it is a SARM, it does so mainly for the bone and muscle tissue, avoiding other organs.
Related products
Muscle Building Bundle
Complete muscle building stack: Ligandrol, Testolone, Ostarine, Ibutamoren
Sources:
[1] Dobs, A. S., Boccia, R. V., Croot, C. C., et al. (2013). Effects of enobosarm on muscle wasting and physical function in patients with cancer: a double-blind, randomised controlled phase 2 trial. The Lancet Oncology, 14(4), 335-345. https://doi.org/10.1016/S1470-2045(13)70055-X
[2] Hoffmann, D. B., Komrakova, M., Pflug, S., et al. (2019). Evaluation of ostarine as a selective androgen receptor modulator in a rat model of postmenopausal osteoporosis. Journal of Bone and Mineral Metabolism, 37(2), 243-255. https://doi.org/10.1007/s00774-018-0929-9
