Dexterz Labs Ostarine MK-2866 10mg 90 Capsules

Ostarine, catalogued as MK-2866 and developed under the names enobosarm, GTx-024 and S-22, is the most extensively studied selective androgen receptor modulator in the published literature. This bottle contains 90 capsules at 10mg of ostarine per capsule, manufactured in the United Kingdom. Supplied for laboratory research only and not for human consumption.

Product specification

What the research says about ostarine

Ostarine was developed by GTx as a treatment for muscle wasting, and unlike most compounds in this category it reached genuine clinical trials. The best known is the phase II study reported by Dalton and colleagues in the Journal of Cachexia, Sarcopenia and Muscle in 2011, which gave 159 healthy elderly men and postmenopausal women enobosarm or placebo for twelve weeks. Total lean body mass increased in a dose related way and stair climbing power improved. Doses used in that published research ranged from 0.1mg to 3mg daily.

Dobs and colleagues published a further phase II trial in Lancet Oncology in 2013 in patients with cancer related muscle loss, again reporting increases in lean body mass against placebo. The later phase III POWER trials in non small cell lung cancer met their lean mass endpoint but did not meet the co-primary physical function endpoint, which is the reason enobosarm was never licensed. That context is usually left out of retail copy: the compound did what it was designed to do to tissue mass and still failed to show the functional benefit regulators wanted.

The pharmacology is straightforward. Ostarine is a non steroidal partial agonist at the androgen receptor with a preference for muscle and bone over prostate tissue, which is what the word selective in the name refers to. Reported findings across the trials include reductions in HDL cholesterol and in sex hormone binding globulin, and suppression of endogenous testosterone at the higher doses studied. Case reports of drug induced liver injury associated with ostarine containing products have appeared in the hepatology literature, though in several of those cases the product was never analysed.

Quality and testing

Dexterz Labs products are manufactured in the UK to a fixed strength per capsule with the batch number printed on every bottle. Independent batch certificates of analysis, confirming identity by HPLC or LC-MS and stating purity, are being commissioned and will be published on this page as each batch is tested. Until then, if you need the batch report for research records, contact sales@sarmsstore.co.uk with your batch number.

Frequently asked questions

Is ostarine legal in the UK in 2026? SARMs are not controlled substances under the Misuse of Drugs Act 1971, so buying and possessing ostarine as a research chemical is lawful in the United Kingdom in 2026. What is not lawful is selling or advertising it for human use, because the MHRA treats it as an unlicensed medicine in that context. That is why this listing, and every listing on this site, is worded for laboratory research and nothing else.

How fast is delivery? Orders placed before the daily cut off are despatched the same working day on a tracked UK next day service. Everything leaves in plain outer packaging with no reference to the contents or to the compound on the outside of the parcel. We ship worldwide, although some destinations are restricted because of local customs rules, and restricted countries are listed at checkout.

How should the capsules be stored? Keep the bottle sealed in a cool, dry place below 25C and out of direct sunlight. Stored that way the capsules remain stable for the shelf life printed on the label. Avoid humid environments such as bathrooms and kitchens, because moisture is the main cause of degradation in capsule form.

Is ostarine detectable in sport? Yes. Ostarine is prohibited at all times under section S1.2 of the WADA prohibited list, which covers other anabolic agents including SARMs. It is one of the most commonly reported adverse findings in anti doping testing, and modern assays detect it at very low concentrations for a long window after administration.

How does ostarine differ from LGD-4033 and RAD-140? Ostarine is the mildest and by a wide margin the best documented of the three, with several completed human trials behind it. LGD-4033 has one published phase I safety study and binds the androgen receptor far more strongly. RAD-140 has no published human efficacy trial at all. That difference in evidence, rather than any claim about potency, is the honest basis for comparison.

Research use only. This product is supplied strictly for laboratory and research purposes and is not for human consumption. It is not a medicine, it is not a food supplement, and it is not intended to diagnose, treat, cure or prevent any disease. Sold to persons aged 18 or over only.