Mastorin S23

Mastorin S23 from Syncom Labs contains S-23, a selective androgen receptor modulator (SARM) that binds strongly to androgen receptors in muscle and bone tissue. Users report noticeable lean mass and strength gains alongside fat loss, which gives it a dry, hard look rather than a bulky, watery one. It is one of the more potent compounds in the SARM category, which also means it carries more risk than milder options like ostarine.

As a guide only and not medical advice, experienced users commonly report a starting point of around 10 mg per day taken orally, with cycles typically running about 8 weeks and rarely exceeding 20 mg per day. This is not a first SARM to reach for. Anyone considering it should read the full usage guide on the product page and speak to a doctor before starting, since S-23 suppresses natural testosterone more than most SARMs on the market.

The most commonly reported issues are suppression of natural testosterone production, changes in mood such as increased aggression or anxiety, hair shedding in those prone to it, and a negative shift in cholesterol markers, particularly lowered HDL. Because of this suppression, many users pair it with a testosterone base and run bloodwork before, during, and after to keep an eye on hormone levels and liver enzymes. This is general information, not a substitute for guidance from a licensed doctor.

Yes. S-23 is one of the SARMs most likely to require a proper post-cycle therapy because of how strongly it suppresses testosterone output. A common approach reported by users is nolvadex at 40 mg per day for two weeks followed by 20 mg per day for two more weeks, or clomid at 50 mg per day for four weeks, usually starting around two weeks after the last dose. Treat this as background information rather than a prescription, and check in with a doctor if you are unsure.

S-23 sits at the stronger end of the SARM spectrum and delivers more noticeable mass and strength gains than something like cardarine, which is valued more for endurance and lipid support than muscle growth. Some users stack the two together, using cardarine to help offset the cholesterol impact of S-23 while adding cardio capacity. First-time SARM users are generally better off starting with a gentler compound such as ostarine before considering S-23.

Every box of Mastorin S23 we sell is authentic Syncom Labs stock and carries its own verification check-code so you can confirm it against the manufacturer before use. Orders placed and paid before midday on a working day usually go out the same day, sent via Royal Mail Tracked 24 in plain, unbranded packaging, with most UK customers seeing their parcel land within one to two working days.