YK11 Myostine 5mg 90 Capsules

Dexterz Labs products are manufactured in the UK to a fixed strength per capsule with the batch number printed on every bottle. Every batch is independently tested and its certificate of analysis is published on the product page and on the Lab Testing page. If you need the batch report for research records, contact sales@sarmsstore.co.uk with your batch number.

Orders placed before 2pm Monday to Friday are dispatched the same day. Tracked UK delivery is free over £60 (£3.49 below), usually two to three working days, with a next day upgrade for £4.49 at checkout. Packaging is plain with no product names on the outside.

Unopened products can be returned within 30 days of delivery for a full refund, and faulty items within 14 days.

Is YK-11 legal in the UK in 2026? YK-11 is not named in the Misuse of Drugs Act 1971 schedules and is bought and held in the United Kingdom as a research chemical. Because it is structurally a steroidal molecule, buyers outside the United Kingdom should check their own national legislation, which in some countries treats it differently. It is supplied here strictly for laboratory research and never for human use.

How fast is delivery? UK orders go out the same working day when placed before the cut off and arrive by tracked delivery, usually within two to three working days for UK addresses, with a next day upgrade available at checkout. Parcels are plain and unbranded, with nothing on the outside that identifies the contents. International delivery is available to most destinations, with a restricted list at checkout covering countries where customs rules make delivery unreliable.

How should the capsules be stored? The bottle should be kept closed in a cool, dry place below 25C, out of direct light. Handled that way the capsules hold to the shelf life on the label. Do not decant into unlabelled containers, because the batch number on the original bottle is what ties the material to its certificate of analysis.

Is YK-11 prohibited in sport? Yes. It is prohibited at all times under the WADA list, which covers both other anabolic agents in section S1.2 and agents that modify myostatin signalling in section S4.4. Either route makes it a prohibited substance for any athlete in a tested sport.

Is YK-11 a SARM or a myostatin inhibitor? Strictly it is neither label as commonly used. It is a steroidal partial agonist at the androgen receptor, and the myostatin connection is indirect, resting on a single report of increased follistatin expression in cultured mouse muscle cells. Treating it as a proven myostatin inhibitor overstates what has actually been published.

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.