Ostarine (MK2866): High Purity 99.84% Lab-Tested Enobosarm for Muscle Growth, Strength, and Recovery
Our latest batch of Ostarine (MK2866) has been independently third-party tested and verified to be 99.84% pure. You can view the full results in the Certificate of Analysis (COA) available in the Data Sheet section below.
What Is Ostarine (MK2866)?
Ostarine, also known by its research name MK2866 or Enobosarm, is a Selective Androgen Receptor Modulator (SARM). It was originally developed to help combat muscle wasting diseases and osteoporosis, but its benefits for muscle building, performance enhancement, and faster recovery have made it a staple in the fitness and bodybuilding communities.
Unlike anabolic steroids, SARMs like MK2866 selectively bind to androgen receptors in muscle and bone tissues rather than affecting the entire endocrine system. This selective targeting leads to powerful anabolic effects (like muscle growth and increased strength) without many of the undesirable side effects typically associated with steroids — such as hair loss, gynecomastia (enlarged male breast tissue), or severe testosterone suppression.
Why Choose Our Ostarine?
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✅ Third-Party Lab Verified at 99.84% Purity
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✅ Research-Backed Anabolic Performance
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✅ Lean Muscle Gains Without Excess Fat
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✅ Reduced Recovery Time & Fatigue
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✅ Joint and Bone Support
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✅ Zero Oestrogen Conversion
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✅ Excellent Safety Profile Compared to Steroids
We stand behind our product with transparency and quality. Each batch is rigorously tested, and the results are publicly available for your peace of mind.
Key Benefits of Ostarine (MK2866)
1. Enhanced Muscle Growth and Strength
Ostarine is highly effective for increasing lean muscle mass. Users typically report steady, quality gains — meaning muscle growth without the added water weight or bloating that comes with traditional steroids. It helps boost protein synthesis and nitrogen retention, both crucial mechanisms for hypertrophy.
2. Boosts Strength, Power & Stamina
MK-2866 supports significant improvements in muscular endurance, explosive strength, and overall stamina. This makes it ideal for athletes engaging in weightlifting, CrossFit, MMA, or competitive sports where explosive power and sustained effort matter most.
3. Accelerates Muscle Recovery
Ostarine can help reduce recovery time between workouts by promoting faster repair of muscle tissue and decreasing exercise-induced inflammation. This means you can train harder, more often, with less downtime — a huge advantage for anyone pushing their physical limits.
4. Supports Joint and Connective Tissue Health
What truly sets Ostarine apart is its ability to relieve joint pain and promote the healing of tendons and ligaments. This is especially important for strength athletes who experience high levels of mechanical stress during training. Many users report improved joint mobility and reduced discomfort, allowing them to maintain consistent workout routines without injury-related interruptions.
5. Improves Bone Density
Ostarine has been shown to increase bone mineral density, reducing the risk of fractures and long-term injuries. For high-impact athletes or older individuals experiencing age-related bone loss, this feature is crucial for long-term mobility and resilience.
6. Minimally Suppressive to Natural Testosterone
Unlike anabolic steroids, which often require post-cycle therapy (PCT) due to significant hormonal disruption, MK-2866 has a relatively mild suppression profile. While short-term cycles may not require extensive PCT, many users still choose to follow up with natural test boosters or mild PCT support for optimal hormone balance.
7. Cleaner Gains With Zero Oestrogenic Activity
MK-2866 does not aromatise into oestrogen, meaning you avoid water retention, gynecomastia, and mood swings associated with hormonal imbalance. The gains are dry, lean, and sustainable — ideal for those who want a defined, muscular physique without bloating.
Who Typically Considers Ostarine?
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Bodybuilders looking for lean mass gains and performance enhancement
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Powerlifters and athletes aiming to boost recovery and joint health
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Beginners seeking a mild yet effective SARM with fewer side effects
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Cutting or bulking individuals looking for muscle retention or growth
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Aging men or women wanting to combat muscle loss or bone density issues (for research purposes)
Researching With Ostarine
Note: Ostarine is intended for research purposes only. This product is not approved by the FDA for human consumption.
Typical research cycle durations range from 6 to 12 weeks, with doses from 10–30mg per day, depending on the goal.. For best results, researchers often combine Ostarine with a structured training and diet program.
For advanced researchers or those familiar with SARMs, Ostarine is often stacked with other compounds such as:
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Cardarine (GW501516) for enhanced endurance
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Ostarine (MK2866) for cutting or re-comping
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Ibutamoren (MK677) for cutting or bulking
Always consult with professionals or conduct adequate research before creating any research stacks.
Purity, Safety & Testing
At Affordable Nutrition, we prioritise purity, transparency, and compliance. Our MK2866 is:
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✅ Manufactured in UK to GMP standards in an ISO certified facility
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✅ Tested for identity, purity, and contaminants
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✅ Shipped securely and discreetly on a Tracked 24 service
View our full Certificate of Analysis (COA) below under the Data Sheet tab for proof of our 99.84% third-party verified purity.
Further reading: Ostarine: The Miraculous Compound For Stronger Bones
January 3, 2024
I'm coming to the end of my first 10 week research programme on 20mg per day and seen a noticeable difference in my muscle definition and strength. Also I feel fitter but that might just be as a result of losing the weight and changing my diet to high protein and high fat but still an unexpected boost. Energy levels up and no side effects whatsoever. Overall very happy about the changes this product has helped make!
July 23, 2025
Reached out to AN and Antony was great, communication is amazing. If you’ve got a question he has the answer. I decided to research ostarine for 8 weeks followed by pct. I put noticeable size on, put around 4kg on, clean bulk 4500cal. I was stronger, looked fuller and mentally I felt extremely alert. Would definitely recommend this product. I had 0 side effects during my cycle also
July 18, 2025
Good product, steady gains and no sides. Not the same as AAS but you know this stuff is legit and much lower risk
June 10, 2025
Excellent service in delivering the product before time on the next day. Great quality ostarine added 5 kilo of lean mass so satisfied with the purchase and will certainly be using these guys again.
May 9, 2025
Absolute belter of a product and love working with these guys super quick on everything
March 1, 2025
Good booster with no bad effects 💪
November 5, 2024
Great product for lean gains and vascularity on a cut. Also delivers a nice boost of energy without any of the sides of injecting steroids, would recommend 100% 👌
August 19, 2024
Overall very happy after 60 days of 20mg. Went from 85KG to 89KG on a lean bulk. Good product for improving recovery, putting on size and gaining strength. Best part of all have kept about 95% of my gains with PCT
June 1, 2024
Coming to the end of the second bottle and seen results in strength, size and vascularity. Fkn love the stuff !!! Can't recommend a better ostarine from a more knowledgeable supplier
April 9, 2024
First time I've ever dabbled in sarms and the strength gains from this ostarine have been epic. Also managed to fit in an extra day per week due to better recovery. I've put on over 4 kilo in 10 weeks and look a lot thicker around the shoulders. Not had any problems as I'm about to start my PCT and still enjoying the occaisonal night out
January 31, 2024
I like this product
November 12, 2023
Fantastic quality product with some of the best customer service that I've ever experienced. Thanks!!
October 7, 2023
Feel great, look the best I've ever looked. No side effects and no issues
August 25, 2023
My 2nd order from here and very impressed with the staff knowledge and delivery times. As for the product so far so good with no sides. 5 weeks in to a 10 week course and noticing improvements in pretty much every exercise. I'm holding the same weight but far better condition on a small deficit of calories.
June 29, 2023
Has to be the best ostarine i've ever tried with no excess water or bloating. Can recommend to anyone who wants to cut and maintain muscle mass.
June 10, 2023
Quality product at a great price. Delivery was super fast with great communication. Will be ordering again!
May 26, 2023
I added 5 kilo over 12 weeks with the help of this on a clean bulk. Zero sides to report and now onto PCT. Good price, quick delivery can recommend.
April 24, 2023
First time I've ever tried SARMs and probably a bit too early to see any results (1 week) but muscle pumps are notably more intense and my order arrived sooner than anticipated
April 6, 2023
Using this for a cut and I’m pleasantly surprised, very clean product. After 6 weeks still seeing strength and muscle gains on a deficit with no visible water retention.
March 27, 2023
Got this to try as a safe option to begin with and I’m pleasantly surprised. Could see the difference after 1 bottle so decided to buy another before running PCT. From what I’ve read I should keep most if not all of my gains. Everything is going in the right direction in the gym and I’ve not experienced any side effects apart from being hungrier. But for my body type (ectomorph) that’s a blessing because I like to get out on my bike too. Adding weight and muscle has always been a challenge but I may now have found the answer.
March 17, 2023
Good lean gains with no water retention or crash afterwards. Highly recommend!!
February 23, 2023
Good stuff noticed a difference in strength after two weeks and recovery has improved massive amounts.
January 19, 2023
High quality product well worth the money
January 14, 2023
I’ve never tried SARM’s before and so I was very impressed that results are starting to show! Would definitely recommend.