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Harm-reduction information only — not medical advice. In crisis or experiencing adverse effects, contact a healthcare professional or your local emergency services immediately.

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Anabolic Steroids/Hormones

Testosterone Propionate

Test P · TP

Short-acting ester with sharp peaks; requires frequent injection. Useful for frontloading.

🚧 Expanded guide coming soon. This compound has PK data and a source — a full overview, mechanism, and dosing guide is pending editorial review.

Pharmacokinetic summary

Model tier
Advanced (t½ + Cmax + Tmax + F)
Half-life
2 days
Cmax
700 ng/dL
Tmax
1.1 days
Bioavailability
84%
Typical dose
50–150 mg

Harm reduction

Aromatizes
Yes
DHT derivative
No
Injection frequency
Daily–EOD

Related compounds

Testosterone Enanthate

Long-acting testosterone ester; the most common TRT and cycle base. Reaches steady state in ~5 weeks.

Testosterone Cypionate

Standard US TRT ester with a slightly longer release tail than enanthate. Steady state ~4–5 weeks.

Testosterone Undecanoate (Castor Oil)

Very long-acting ester (Nebido). Dosed 1000 mg every 10–14 weeks for TRT. NHS standard.

Protocols featuring Testosterone Propionate

Test P + Tren A Cutting Cycle (10 weeks)

Short-ester cutting stack of Test Prop and Trenbolone Acetate.

Test P + Winstrol Cutting (10 weeks)

Cutting cycle finishing with oral Winstrol (stanozolol) 50mg/day for the final 6 weeks, alongside a Test P base.

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