Proviroxyl is Kalpa Pharmaceuticals mesterolone, 25 mg per tablet, one strength, one pack. It is the odd one out in an oral line: a DHT-derived androgen with a strongly androgenic and only weakly anabolic character, and it belongs to the small group of oral steroids that carry no methyl group at carbon seventeen.
That last detail is why mesterolone interests people who are wary of oral hepatotoxicity. It is also why it should not be mistaken for a cycle in itself. Nothing about the compound builds meaningful muscle, and the reference material is explicit that it supports a course rather than constituting one.
Product Overview
The compound does not aromatize, so fluid retention and gynecomastia are absent from its profile and an aromatase inhibitor has no role beside it. What it does instead is latch onto the carrier protein tightly: with sex hormone binding globulin occupied, a larger share of testosterone stays unbound and available, and that is the mechanism behind most of its on-cycle reputation.
The oral half-life is quoted at twelve to thirteen hours, so a day is normally split into two or three intakes. It is not alkylated, which keeps the hepatic risk low, and it is not a hormone that becomes estrogen anywhere in the body. Doses in the reference material run from a replacement-style 25 mg several times a day to a sports figure of 25-100 mg daily, with the top of that range resting on vendor practice rather than on published work.
Dosage Protocol
Amounts are daily oral totals. Proviroxyl is usually dosed for as long as the main cycle runs, not as a block of its own.
| Beginner | 25 mg a day while the main course lasts; the medical pattern divides the same total into three separate doses |
| Intermediate | 50 mg a day, taken in two divided doses |
| Advanced | 50-100 mg a day; the ceiling is a vendor figure and no published source confirms it |
| Female | Not recommended. Androgenic activity is the whole point of the compound, and virilization is the predictable price |
| Administration | Oral, split into two or three doses, with food to avoid stomach discomfort |
Suggested Protocols
There is one sensible way to place this product: alongside a course that needs more free androgen, at a low dose.
What to Expect
- Androgenic tone inside two weeks. Libido and a denser appearance are the first things users report, well before any change in measurements.
- Free testosterone may rise. Binding of SHBG leaves more of the circulating hormone unbound, which is the effect most users are chasing.
- Nothing to hold. No water and no breast sensitivity, because there is no aromatization step in this molecule.
- Androgenic side effects can appear. Acne, scalp hair shedding and voice change are all documented, and they are the reason the dose stays modest.
- It is not an anabolic agent. Expecting muscle gain from mesterolone alone is a misunderstanding of what the compound is.
- Lipids still move. HDL can fall under androgen exposure, which is a reason for a panel even on a low dose.
Side Effects and Management
Almost everything on this list is androgenic, because there is no estrogenic arm to the molecule at all.
Recovery and Follow-Up
Proviroxyl is not a recovery drug and does not shorten anyone's recovery. Therapy after a course is built on a SERM and timed by the esters that were used.
Storage and Ordering
A dry cupboard at room temperature, the pack kept closed, and the batch and expiry read on arrival - nothing about a plain tablet requires more than that.
Proviroxyl belongs to the Kalpa Pharmaceuticals catalogue and is normally ordered with the rest of a course: Testoxyl Enanthate 250, Nandroxyl 250 or Boldaxyl 300 as bases, Stanoxyl 10 for a dry oral, and Nolvaxyl with Clomixyl for the end of the block. Orders are packed plainly and both shipping options are shown on each product page.
