Anabolic Steroids/Hormones Human clinical data

Testosterone Phenylpropionate

Test PP

2.5 days

Half-life

50–200 mg

Typical dose

2–3×/week

Frequency

TRT ongoing / cycles 8–12 weeks

Cycle length

Medium-chain ester (Sustanon component). Simple model — peak calibrated from sibling esters.

Key takeaways

Short-to-medium ester; the 60 mg mid-ester in Sustanon 250, rarely used standalone.
~2.5-day half-life (sibling-ester estimate); injections 2–3× weekly.
Faster washout than enanthate or cypionate if side effects show up.
Same aromatization, suppression, and monitoring needs as any testosterone ester.

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

Reported dosing protocols

Protocols reported in research literature and clinic/community use — informational context, not a dosing recommendation.

Use case	Dose	Route	Frequency	Duration
Blend component (Sustanon 250 label)	60 mg per mL of blend (250 mg total)	IM	Blend every 2–3 weeks (label); community splits 1–2× weekly
Standalone (community)	50–200 mg per injection	IM	2–3× weekly	8–12 weeks

Pharmacokinetic summary

Model tier: Simple (t½ + F, Tmax estimated)
Half-life: 2.5 days
Cmax: 94.1 ng/dL
Bioavailability: 69%
Typical dose: 50–200 mg

Harm reduction

Aromatizes: Yes
DHT derivative: No
Injection frequency: 2–3×/week

Frequently asked questions

How does phenylpropionate differ from propionate?

The ester is slightly longer, giving a ~2.5-day half-life versus roughly 2 days for propionate. In practice that means marginally smoother levels on the same 2–3× weekly schedule; the difference is small enough that most protocols treat them as interchangeable.

Is there real human PK data on this ester?

Not as a standalone product. Its curve here is calibrated from sibling esters and Sustanon blend data, so the plotter values are estimates. Sustanon itself has been studied, but the blend confounds the individual esters.

Why is it in Sustanon at all?

Sustanon stacks four esters so the blend peaks fast (propionate) and holds for weeks (decanoate). Phenylpropionate fills the middle, covering roughly days 2–7 after injection. Whether the blend actually beats a single ester at the same schedule is debatable.

References

TAU ester PK review — Cmax calibrated to ng/dL serum peak.
Pharmacology of testosterone replacement therapy preparations (TAU 2016) — Review covering ester release mechanics and blend rationale.
Structural Aspects and Intermolecular Energy for Some Short Testosterone Esters (Materials 2022) — Computational study of short-ester structure; physicochemical, not human PK.

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