View our latest HPLC-Assay: Purity (3rd-party lab test) on MK-2866
1 bottle (30mL) of MK-2866 | Ostarine, dosed at 25mg/mL:
Please note as of January 18th, 2021, MK-2866 is now 25mg/mL. Bottles sold before January 18th, 2021 were 20mg/mL. This change is effective for all bottles. New Winter flavor labels may not reflect the change.
- Retain Muscle Tissue
- Increase Strength In A Caloric Deficit
- Join Healing Properties
- Fat Mass Reduction Properties
- Best Used 8-12 Weeks
Stacks well with:
S-4, GW-501516, RAD140, MK-677, & 1-Andro.
What Is MK2866?
MK-2866 is an androgen receptor modulator that was designed to treat Cachexia (a muscle-wasting disease).
Application Of MK-2866 | Ostarine
Two human trials that went through treatment of MK-2866:

Justin (verified owner) –
Joint pain instantly gone and skin clears up surprisingly as well as vascularity. Overall am very happy with the results so far! The gains are real wirh rats army!
Gabe (verified owner) –
Super fast shipping, great customer service, and everything arrived intact! Flavor is much better than traditional liquids, will definitely be ordering again.
derek.c.phillips –
So far so good. I am on week 2 of my first bottle. My rat began noticing effects around day 5. The rat has been eating at a deficit and continues to notice strength gains and is looking jacked. Extremely quick shipping for an APO address. Highly recommend this company
Ryan –
So far it’s been a good experience. Good product and tastes well.
Dallas Stone (verified owner) –
This is pure quality. My rat gained around 2kg muscle 5 weeks using this (she is a female) and I gained just over 3kg in muscle. Strength has increased massively. Highly recommend
Sonny Kana (verified owner) –
Pretty fast shipping considering coming to Australia. Great taste and can definitely feel the strength gains!
Beau (verified owner) –
The quality of this product has been epic! Flavour makes it easier to down. Only a couple of days in and already feel an edge. My pumps are fuller, sessions are more intense feeling strong. Quality product.
xsnottrocketx –
Great stuff!! Highly recommended!
Go.crazy (verified owner) –
I’m a couple days in and my pumps are way better!!
Adrian –
MK-2866 other known as Ostarine is the one Sarm I always run to when running a cycle. The fullness, hardness and strength that I get is amazing because I see a noticeable difference within the first week of application. I love to combine this with GW and MK-677. You will absolutely love this Sarm and any other you choose from Rats Army!
Marquise (verified owner) –
The best to say the least ! I not only gained muscle but shed some fat. I did a 2 month cycle, and i can’t wait to start the next one.
Domenic Pardon (verified owner) –
This is good stuff. Recovery is great, better pumps, no joint issues, most of my lifts went up, overall just feel better. would recommend for sure
cubanpie4sho (verified owner) –
So far so good starting week 2 already starting to notice more energy and a bit of strength at the gym this stuff definitely works totally recommend.
Jon –
used 3x now. Noticeable body recomp effect gets better and better each time. no supression and feeling good even post cycle. nice addition or standalone to a current stack!
Jim (verified owner) –
I received this in the mail a little over a week ago. It was really nice to have Ostarine again! My pharmacy would no longer carry it and it was a huge disappointment, as this compound really helps with my joint pain. After almost 30 years of training, the old joints need some help. Lol! The taste was better than expected but still something to get used to. I will definitely be ordering more!
Jayson Walter –
Quality products, decent shipping time
Strength Gains where Great!
Jordan Vincent (verified owner) –
Real legit stuff! Only did a short 4 week cycle and increased all my compound lifts by 20kg, will definitely be ordering a lot more!
Al –
Ordered many products from this company this was one of them. They all worked and are great but they never payed the postage. So I had to pay out of my own pocket and caused it to be 4 days late. Hesitant to order again.
Tyler –
Hi,
Thank you for the review! Regarding your postage, it shows on our Shipping & Returns policy that we no longer pay duties and taxes in regards to international shipments. That is the sole responsibility of the consumer. If you would like to know how we mitigate as much cost as possible with international fees, give us a call or email!
Nate Lowe (verified owner) –
Im blown away by mk2866. I never thought my rat gain so much strength in such a short time. Thank you for making a great product.
Derek –
Love the products, actually surprised how well it stacked with the rad 140! Good jobs rats! Keep the products rolling . Will be back for more
Doug (verified owner) –
This stuff is great, my rat seems to be enjoying clown tears flavor. I’ve seen nice gains and endurance in my rat. This company is one of the best legit companies in the market. With easy payment method and proper packaging for shipping.! This is my go to for all sarms.
Sam Stebbins (verified owner) –
Great beginner research if your on sure of the whole “rat research” Mild to no side effects and very great cutting agent. Also my rats neck was hurting pretty bad from benching, this healed it right up after a week or so.
Dustin Morell (verified owner) –
Fast shipping, no hassle
Chris Williams –
I can’t say products are bad because they did what they were supposed to but they literally made me sick, like throw up sick. I stopped using after only one bottle and switched to another brand and felt fine. Now, I want to be very clear here I’m not knocking RA or saying anything negative about the product, could’ve just been my bodily reaction. I will say I’ve used other products from reputable sources in the past and have seen results so I know they were real and never got/felt sick. I just chalked it up to must be the flavoring that my body/stomach doesn’t like, all other aspects were there would be 5 stars other than I felt like $hit on them.
RAD140
GW501516
George Grigg (verified owner) –
The gains are unreal. My rat is is gaining muscle constantly and loving the mood improvements.
mikelscomet (verified owner) –
Great product
Jalal (verified owner) –
I ordered this product 3 weeks ago. They charged my account for the price but never received the product
Tyler –
Hi,
Please call us at 406-890-3945 so we can resolve this issue immediately.
Edward Archer (verified owner) –
Just another Rats Army product that does EXACTLY what it says it will do.
Rats Army customer for life!