Keifei Proviron Mesterolone

Provironic — Mesterolone

Pharmaceutical Form: Oral Tablets | Dosage: 25 mg per tablet

Chemical Information

• Chemical Name: Mesterolone
• Chem.Abstr.Name: 1α-methyl-17β-hydroxy-5α-androstan-3-one
• Molecular Formula: C20H32O2
• Molecular Weight: 304.47

Presentation

Each 25 mg tablet is purple, film-coated, round and concave with a KF imprint on one side. Packed in plastic blister packs (5 strips × 10 tablets = 50 tablets per box). Each box includes a 10-digit authentication code for verification.

About Provironic (Mesterolone)

Mesterolone is an orally active, 1-methylated DHT derivative. As a non-aromatizable androgen, it does not convert to estrogen. Due to tissue control via 3α-HSD and protein binding (SHBG/albumin), it is not considered a primary agent for muscle hypertrophy when used alone.

Common Uses in Bodybuilding Context

• Estrogen management: High affinity for aromatase may help reduce estrogenic side effects and water retention when combined with aromatizable steroids.
• Free testosterone support: Competes for SHBG/albumin, potentially increasing the fraction of free testosterone from concurrent testosterone use.
• Pre-contest look: Often added to enhance hardness and muscle density by minimizing fluid retention.
• Libido support: Used alongside compounds that may suppress libido (e.g., nandrolone, trenbolone).

Safety & Notes

• Generally well-tolerated in men; high doses may cause virilization in women.
• Typical use ranges reported: 25–50 mg/day sufficient for most goals (higher doses are usually unnecessary).
• May suppress natural testosterone; not advised as a standalone long-term agent.