CORE SARMS MK-2866 Ostarine 10mg research compound bottle
Lab Tested 10mg Pure

Ostarine (MK-2866)

Muscle Preservation SARM

£45.00

What’s Included

  • tick-icon60 capsules per bottle
  • tick-icon10mg pure MK2866 per capsule
  • tick-icon2-month supply (1 cap daily)
  • tick-iconThird-party lab certificate included

Safe & Secure 3D Checkout

Lab Tested

Lab Tested

Third-party verified

Fast Shipping

Fast Shipping

3-5 business days

24/7 Support

24/7 Support

Expert guidance

Product Description

Ostarine MK2866 is the most researched and widely used SARM, known for its exceptional ability to preserve muscle mass during cutting phases while promoting lean gains during bulking. It’s the perfect introduction to SARMs for beginners and an essential tool for experienced users.

Our premium Ostarine is manufactured to the highest pharmaceutical standards and undergoes rigorous third-party testing. Each capsule contains 10mg of pure MK2866 for optimal results with minimal side effects.

 

The Most Versatile SARM Available

Ostarine MK-2866’s versatility is what sets it apart from every other SARM on the market. While most compounds excel in one specific context, Ostarine performs reliably across all three primary goals: lean bulking, cutting, and injury recovery.

This makes it the most practical all-around SARM available, and the reason it remains the highest-selling compound in its class.

28 reviews for Ostarine (MK-2866)

  1. Martin Fischer

    As a total noob, I love it (beginner friendly)

  2. Piotr Nowak

    Works wonders

  3. Jan Kowalczyk

    Decent price and good service.

  4. Adam Dąbrowski

    Lol

  5. Pavel Ivanov

    Must have!

  6. Sergei Volkov

    Interesting compound

  7. Andrei Popescu

    Fast delivery and discreet package. I will test the product tomorrow.

  8. Mihai Ionescu

    Strength spikes are real, but still love it!

  9. Bogdan Stanescu

    Also works.

  10. Alexander Petrov

    Hits faster than you think (trust me lol)

  11. Radu Dumitrescu

    10/10

  12. Marek Zielinski

    When I went on a cut not only did I lose fat but I also kept the gains and against all odds, saved all my muscle.

  13. Ion Marinescu

    This will be my fifth cycle with it.. I think it really works – idfk

  14. Mark Lewis

    MK-2866 at 10mg was my first cycle ever. I dont know about other compounds i feel like there is no better compound than this one. At this dose it was amazing no sides at ALL, good recovery and consistent strength. For someone who doesn’t trust all other compounds because of suppression and sides – this is the one. Various dosages its very versatile, higher dose with no sides or lower dose doesnt matter – MK2866 does it all.

  15. Adam Abraham

    Favourite one yet

  16. Donovan Onyx

    Best thing I have ever tried

  17. Kellen Justice

    I really like this, just because its on the milder side

  18. Vinal Randall

    15mg is the sweet spot. Only ups and no downs

  19. Brad Pete

    Its really easy to use

  20. Leighton Luke

    This is really smooth

  21. Rylan Geffrey

    This didn’t disappoint at all

  22. Xavier Audley

    This is really easy to use

  23. Jrue Jett

    My trust is earned

  24. Munro Lanford

    Good

  25. Joziah Jae

    Perfect for beginners

  26. Callahan Galen

    MK-2866 at 10mg was my first cicle ever. I dont know about other compounds i feel like there is not a better compound that this one. At this dose it was amazing no sides at ALL, good recovery and consistent strength. For someone who doesnt trust all other compounds because of suppresion and sides – this is the one. Various dosages its very versatle, higher dose with no sides or lower dose doesnt matter – MK2866 does it all.

  27. Jarred Moon

    I took 20mg, and the results were just incredable

  28. Brett Morton

    My favourite SARM, no doubt

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Key Benefits

Muscle preservation

Muscle preservation

Lean gains

Lean gains

Enhanced recovery

Enhanced recovery

Joint health support

Joint health support

Improved strength

Improved strength

Body recomposition

Body recomposition

Ingredients & Dosage

Active Ingredients

Ostarine (MK2866)

10mg

Selective androgen receptor modulator

Black Pepper Fruit Extract (Piper nigrum)

5mg

Enhances absorption and bioavailability

Purity & Quality

Third-party lab tested Third-party lab tested
99.7%+ purity guaranteed 99.7%+ purity guaranteed
24-month shelf life 24-month shelf life

Muscle Preservation & Growth

Ostarine MK2866 works by selectively binding to androgen receptors in muscle and bone tissue, promoting anabolic activity while minimizing androgenic side effects. This selective action makes it ideal for both muscle building and preservation.

The compound increases protein synthesis and prevents muscle catabolism, making it particularly valuable during caloric restriction or intense training periods. Its mild nature and excellent safety profile make it suitable for longer cycles.

With a half-life of 24 hours, Ostarine MK2866 provides consistent anabolic support throughout the day, helping maintain muscle mass and strength even in challenging conditions.

Key Actions

1 Selectively targets muscle tissue
2 Prevents muscle catabolism
3 Supports protein synthesis

How to Use

Dosage

Dosage

10mg once daily

Timing

Timing

Take with morning meal

Cycle Length

Cycle Length

8-12 weeks followed by 4-week break

Important

Important

Dietary supplement use only

Important Notes

Very well tolerated. Can be used for cutting or lean bulking phases.

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.

Frequently Asked Questions

Ostarine is a selective androgen receptor modulator known for muscle preservation, lean gains, and an excellent safety profile.

Yes, Ostarine is considered the best SARM for beginners due to its mild effects and excellent safety record.

Absolutely. Ostarine is excellent for preserving muscle mass during caloric deficits and cutting phases.

Expect lean muscle gains, improved recovery, maintained strength during cuts, and overall body recomposition.

Expect lean muscle gains, improved recovery, maintained strength during cuts, and overall body recomposition.

Reported effects may include mild fatigue, mood changes, or temporary hormonal shifts. Not everyone experiences these, but they are possible.

Typical cycles range from 8-12 weeks, followed by a 4-week break before starting another cycle.

Yes, Ostarine (MK-2866) can cause a temporary suppression of natural testosterone production during a cycle, especially at higher doses or extended use. The effect is usually mild and reversible once the cycle is complete.

Ostarine has a half-life of around 24 hours, meaning it stays active in the body for a full day. However, trace amounts may remain detectable for up to several weeks after discontinuation, depending on dosage, metabolism, and individual factors.

No, Ostarine is not a steroid. It is a Selective Androgen Receptor Modulator (SARM) that mimics some of the muscle-building benefits of anabolic steroids but with fewer side effects. Unlike steroids, Ostarine selectively targets muscle and bone tissue without significantly impacting other organs.

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

Customer Reviews

4.93 out of 5 (28 reviews)
Brett Morton
2026-01-27

My favourite SARM, no doubt

Jarred Moon
2026-01-26

I took 20mg, and the results were just incredable

Callahan Galen
2026-01-25

MK-2866 at 10mg was my first cicle ever. I dont know about other compounds i feel like there is not a better compound that this one. At this dose it was amazing no sides at ALL, good recovery and consistent strength. For someone who doesnt trust all other compounds because of suppresion and sides - this is the one. Various dosages its very versatle, higher dose with no sides or lower dose doesnt matter - MK2866 does it all.

Write a Review


Ostarine (MK-2866)

Ostarine (MK-2866)

£45.00
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