SARMs for Bulking and Lean Muscle
About this range
Selective androgen receptor modulators in this collection are the compounds most often studied in published research on lean mass and muscle: Ostarine (MK-2866), Ligandrol (LGD-4033), Testolone (RAD-140), Myostine (YK-11) and the growth hormone secretagogue Ibutamoren (MK-677), alongside the Dexterz Labs muscle stacks that combine them.
Every Dexterz Labs product is manufactured in the United Kingdom to a fixed strength per capsule and carries a batch number on the bottle. Every batch is independently tested and its certificate of analysis is published on the product page and on the Lab Testing page.
Before choosing a compound, read the research guides: Ostarine (the only SARM with phase III data), LGD-4033, RAD-140, MK-677 and SARMs studied for lean mass. Each guide sets out what the trials found, the doses used in the research, the side effects reported and the legal position in the UK in 2026.
Products are supplied strictly for laboratory research and are not for human consumption. Nothing on this site is medical advice. 18+ only.