YK11

YK-11 is a steroidal compound that works by inhibiting myostatin, a protein that puts a natural brake on muscle growth. Because it blocks that brake rather than just binding androgen receptors like a typical SARM, users tend to see faster and more pronounced lean mass and strength gains over a short cycle. This more anabolic mechanism is also why YK-11 carries more steroid-like side effects than compounds such as ostarine or LGD-4033.

Each capsule in this bottle delivers 10mg of YK-11, and cycles typically run 6 to 8 weeks, not longer. A conservative approach for someone who has already run milder compounds is 5mg per day for the first two weeks, stepping up to 10mg per day for weeks three through six, but this is not a beginner compound and first-time users are usually better served starting with something like ostarine. Doses are taken orally with food, and total cycle length should not exceed 8 weeks.

YK-11 suppresses natural testosterone production and puts real stress on the liver, so a testosterone base and liver support such as N2Guard are treated as required, not optional. Users can also see a drop in HDL cholesterol along with a potential for acne and hair loss in those already prone to it. A full PCT is mandatory afterward, starting nolvadex at 20mg per day or clomid at 50mg per day for 4 weeks beginning 2 days after the last dose, alongside a bloodwork check of testosterone, oestradiol, LH, FSH, lipids and liver enzymes before, during and after the cycle.

Ostarine is a true SARM that binds androgen receptors selectively and is considered mild enough for a first cycle with minimal suppression. YK-11 works through a different pathway, myostatin inhibition, and produces a noticeably harder, more steroid-like result in a much shorter time frame, but it comes with meaningfully more suppression and liver strain. For that reason ostarine is the sensible starting point, with YK-11 reserved for users who already have a cycle or two behind them and are prepared to run proper support and PCT.

Yes. YK-11 suppresses natural testosterone output, so PCT is required rather than optional. The standard protocol is nolvadex at 20mg per day or clomid at 50mg per day for 4 weeks, starting 2 days after the last dose, with bloodwork used to confirm hormone levels have recovered before considering another cycle.

Every bottle is genuine Syncom Labs product with a verification check-code printed on the box so you can confirm authenticity before use. Orders ship from the UK on Royal Mail Tracked 24 in plain, discreet packaging, with most UK orders arriving in 1 to 2 working days, and same-day dispatch if your order is placed and paid before noon on a working day.