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Muscle & performance

Testosterone Propionate

The short testosterone ester - fast on and off, more frequent injections.

1 min read 9 sources

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Glass vial with pale yellow oil and a black TPD label on a white podium, next to it a large blue 3D steroid molecule with a short ester chain in a bright lab
Approved · since 1974

Summary

At a glance

Sources checked on 26 Oct 2026

Above the physiological level
48 hours

After one injection in healthy men, the ester itself was measurable at a steady level for 3 to 36 hours2

Bench press in 10 weeks
+22 kg

Testosterone with strength training, study with enanthate (same testosterone once the ester is split off)1

Stopped the ointment
70 %

Because of lack of response in lichen sclerosus, with a corticosteroid ointment 10 percent3

Phase 3 in the registry
0 trials

none in phase 2 either, as of 26 Oct 20268

  • Testosterone Propionate is testosterone with the short propionate ester. It rises fast and clears fast and acts on the androgen receptor.97
  • After one injection testosterone stayed above the physiological level for 48 hours in healthy men, while their own production barely changed.2
  • Once the ester is split off, the same testosterone acts as with enanthate. In the best-known study muscle size and strength rose clearly within 10 weeks, most of all with strength training.1
  • As an ointment on the skin propionate was clearly inferior to a corticosteroid ointment in vulvar lichen sclerosus. Given through the skin, brief testosterone peaks above the normal range appeared.35
  • According to ChEMBL propionate has been an approved drug since 1974, there is no phase 2 or 3 trial on the registry. Everything here is the state of research, not a recommendation.98
Profile

Updated June 2026

How long does it stay in the body?

Share left after one dose, calculated with a half-life of ~21.6 hours

Half-life ~21.6 hours
After 43 hours: 25 %
Hour 22 · 49 %Hour 43 · 25 %Hour 48, next dose · 21 %Hour 65 · 12.4 %Hour 108 · 3.1 %

Simplified model without an absorption phase, half-life from the TPD lexicon. The lexicon gives 19.2 to 24 hours, we calculate with the middle.

Class
Testosterone ester

short-acting

Use
Intramuscular

every other day

Half-life
about 0.8-1 day
WADA
banned

anabolic

Sizes
2 sizes

100mg/ml, 150mg/ml

Contents 14 sections
  1. At a glance
  2. What is Testosterone Propionate?
  3. How it works
  4. Pros and cons vs long esters
  5. Dosing
  6. What the research shows
  7. Research status
  8. Side effects
  9. Storage
  10. PCT / after coming off
  11. Related compounds
  12. FAQ
  13. Glossary
  14. Sources

What is Testosterone Propionate?

Testosterone Propionate (Test P) is testosterone with the short propionate ester. It rises fast and clears fast. That means more frequent injections (usually every other day), but also faster control - if you need to stop, levels drop quickly.

This information is for research and educational purposes only. No medical advice.

How it works

Same action as all testosterone esters: androgen receptor activation, protein synthesis, nitrogen retention. The only difference is kinetics - faster on and off due to the short ester.

Where it acts

One receptor, several organs

Tap a point or a card. Grey = effect seen in trials.

  1. Blood

    Testosterone above the physiological level for 48 hours, brief peaks when given through the skin2

    Observed in trials
  2. Skeletal muscle

    Muscle size and strength increased, study with enanthate1

    Observed in trials
  3. Prostate and seminal vesicles

    Secretions in the seminal fluid fell by day 14, faded after stopping4

    Observed in trials
  4. Skin

    As an ointment inferior to a corticosteroid ointment in lichen sclerosus3

    Observed in trials

Targets in the ChEMBL database9

Compound CHEMBL1170: one recorded mechanism, agonist with direct binding to the human receptor.

Androgen receptor
Gene
AR
UniProt
P10275
ChEMBL
CHEMBL1871
Action
Agonist, direct binding
Blue 3D molecules quickly leave a glass droplet and land glowing on bright, blue shimmering muscle fibres
The short ester releases testosterone quickly. Symbolic image.

Pros and cons vs long esters

  • Pro: fast control, less water retention is often reported, quickly "out" if needed.
  • Con: frequent injections (every other day), propionate often stings more at the injection site than long esters.

Comparison

Short and long esters

The same compound at the same receptor with esters of different length, as stated in the TPD lexicon. Tap a card to open its entry.

Short ester Testosterone Propionate AR
Medium ester Testosterone Phenylpropionate AR Long ester Testosterone Enanthate AR Long ester Testosterone Cypionate AR Very long ester Testosterone Decanoate AR Ultra-long ester Testosterone Undecanoate AR

Dosing

Dosing

Dosing, titration and syringe

Loading the dosing information …

  • Getting started and stepping up, drawn as a staircase
  • Units on the U-100 syringe for every step
  • How long one vial lasts

What the research shows

As with all esters, testosterone research (Bhasin et al., NEJM 1996) applies equally - once the ester is cleaved, the same testosterone acts. Propionate differs only in pharmacokinetics.

Study results

What the trials measured

Interactive: switch tabs, tap points, show or hide arms. Arms are named relative to each other, no dosing advice.

Strength gain in 10 weeks1

Gain in kg, 43 healthy men, study with enanthate

Bench press1
Placebo without training -1 kg
Testosterone without training +9 kg
Testosterone with training +22 kg
Squat1
Placebo without training +3 kg
Testosterone without training +16 kg
Testosterone with training +38 kg

The value for placebo with training is not given in the abstract. With training the men gained 6.1 kg of fat-free mass, mood and behaviour did not change in any group. Once the ester is split off, the same testosterone acts.

Stopped because of lack of response3

Share of women, 20 women per group, follow-up over 1 year

Vulvar lichen sclerosus3
Propionate ointment 70%
Corticosteroid ointment (comparison) 10%

After 3 months symptoms were similar in both groups, but findings were better with the corticosteroid ointment. After one year the corticosteroid ointment was clearly superior in both.

Glass metronome on a wooden table in a bright room, next to it a milky white torso sculpture and a green plant
Short ester, short rhythm: frequent doses. Symbolic image.

Research status

Where the research stands

There is no phase 2 or 3 trial with Testosterone Propionate on the registry. Shown is one phase 1 trial in which propionate was one of three possible esters. As of 26 Oct 2026. 8

  1. Preclinical Pharmacology of testosterone esters
  2. Phase 1 1 trial, 1 completed
  3. Phase 2 no registered trial
  4. Phase 3 no registered trial
  5. Approval since 1974
Approved: ChEMBL lists Testosterone Propionate with phase 4 as the highest phase and first approval in 1974.9

Apart from 1 phase 1 trial there is no registered trial in phase 2 or later. 8

Side effects

  • Estrogen-related: water retention, gyno risk (often perceived as somewhat lower).
  • Stinging / irritation at the injection site more common than with long esters.
  • HPTA suppression - PCT topic.
  • Androgenic: acne, hair loss in predisposed individuals.

Storage

Store the oil solution at room temperature, protected from light - no fridge needed. Out of reach of children.

Four glass vials with golden oil on a white shelf, next to them a folded light blue cloth
Oil solution at room temperature and protected from light, no fridge needed. Symbolic image.
Level · Testosterone Propionate

How the level builds up

One dose every other day: each dose adds to what is left of the previous one.

Lexicon: Intramuscular, every other day
Peak 1.27×Trough 0.27×
Day 2 · 2. dose
1.21× of the first dose
Plateau
from Day 2

95 % of the plateau after dose 2

Peak
1.27×

of the first dose

Trough
0.27×

before the next dose

Simplified model, values relative to the first dose, no dosing information. Dashed: the first dose alone, green: the plateau.

Related

Related compounds

Same receptors or blends with Testosterone Propionate: all in the TPD lexicon.

Testosterone Propionate
Testosterone Enanthate Long ester, less frequent doses Testosterone Cypionate Long ester Testosterone Phenylpropionate Medium-length ester, closest relative Test Suspension No ester, even shorter Tri-Test One version contains propionate plus two long esters Test/NPP Mix 150 Contains propionate plus nandrolone phenylpropionate Test/Tren Short 150 Contains propionate plus trenbolone acetate Tren/Test/Mast Short 150 Contains propionate plus trenbolone and drostanolone Test Mix (high dose) Contains propionate plus three more esters

FAQ

Common questions about Testosterone Propionate

Short answers, each backed by the sources below.

How fast does propionate rise and clear?

Fast. In a study with labelled propionate the ester was measurable at a steady level in the blood 3 to 36 hours after the injection. The testosterone formed from it stayed above the physiological level for 48 hours, while the body's own production barely changed in that time.2

Is Testosterone Propionate approved?

Yes. The ChEMBL database lists Testosterone Propionate as an approved drug with first approval in 1974. On ClinicalTrials.gov there is no phase 2 or 3 trial, only post-approval trials or trials without a phase. Everything here is the state of research, not a recommendation.98

Does the muscle research on testosterone apply to propionate?

In principle yes, because once the ester is split off the same testosterone acts. The best-known study used enanthate: without training bench-press strength rose by 9 kg on testosterone and fell by 1 kg on placebo. With training the men gained 22 kg in bench press, 38 kg in squats and 6.1 kg of fat-free mass.1

Was propionate also studied as an ointment?

Yes, in vulvar lichen sclerosus. In a study with 20 women per group a corticosteroid ointment was clearly superior after one year. 70 percent stopped the propionate ointment because of lack of response, 10 percent with the corticosteroid ointment.3

Which effects were seen in studies?

In a small study with seven men short-term high-dose propionate lowered components of the seminal fluid from the prostate and seminal vesicles by day 14, among them PSA, zinc and fructose. The effect faded after stopping. Given through the skin, athletes had brief testosterone peaks above the normal range more often than on placebo.45

How long is propionate detectable?

In a doping control study with a mix of four testosterone esters all esters were detectable in blood and detection time depended on the ester. For the short esters the measured level also depended on the type of blood tube. Testosterone is banned in official competition.6

Glossary

Terms explained briefly

Dotted words in the text open these explanations directly.

Androgen receptor
Protein inside the cell that testosterone binds to. Genes are then read, for example for muscle building.
EOD
Short for every other day.
Ester
An attached acid chain. The shorter it is, the faster testosterone is released from the depot and the more often it has to be injected.
Hormone axis (HPTA)
Hypothalamus, pituitary and testes together control the body's own testosterone production. Testosterone from outside suppresses this axis.
Lichen sclerosus
Chronic skin condition, often in the genital area, with whitish, thin patches of skin.
Nitrogen retention
The body retains more nitrogen, a sign that more protein is built than broken down.
PCT
Post cycle therapy: the phase after stopping in which the body's own hormone axis is meant to recover.
Pharmacokinetics
How fast a compound enters the blood, how high the level rises and how fast it is cleared again.
Placebo
Dummy preparation without active substance. Comparing against it shows what is due to the substance itself.
Trial phases
Phase 1 tests tolerability in a few people, phase 2 looks for the dose, phase 3 confirms benefit and safety in many. Phase 4 runs after approval.

Practice

PCT / after coming off

Anabolic substances suppress the body's own testosterone production in the research context. Anyone who comes off a cycle (rather than running it continuously) typically uses a post-cycle therapy (PCT) to restart the natural axis (HPTA).

The standard scheme in the research/literature context combines a SERM (tamoxifen and/or clomifene, alternatively enclomiphene) over roughly four weeks, optionally preceded by HCG to re-sensitise the testes before the SERM block. An aromatase inhibitor (anastrozole/exemestane) belongs more to on-cycle estrogen control than to the PCT itself.

Tip: order the PCT items together with the cycle so they are already on hand when you come off.

This information serves research and educational purposes only. Not medical advice.

Tamoxifen (Nolvadex) SERM, core of PCT View Clomid (Clomifen) SERM, core of PCT View Enclomiphene (Androxal) SERM alternative View HCG testicular restart before PCT View Arimidex (Anastrozole) aromatase inhibitor, on-cycle View Aromasin (Exemestane) aromatase inhibitor, on-cycle View

Evidence

Sources

Show all 9 sourcesHide sources 7 Studies1 Trial registry1 Database checked 26 Oct 2026

Studies

  1. Supraphysiologic testosterone doses, muscle size and strength in healthy men

    Bhasin et al., New England Journal of Medicine, 1996

    DOI 10.1056/NEJM199607043350101 PMID 8637535
    Checked 26 Oct 2026 via doi.org, Crossref, PubMed
  2. Pharmacokinetics after one injection in healthy men

    Fujioka et al., Journal of Clinical Endocrinology and Metabolism, 1986

    DOI 10.1210/jcem-63-6-1361 PMID 3782423
    Checked 26 Oct 2026 via doi.org, Crossref, PubMed
  3. Propionate ointment versus corticosteroid ointment in lichen sclerosus

    Bornstein et al., American Journal of Obstetrics and Gynecology, 1998

    DOI 10.1016/s0002-9378(98)70631-3 PMID 9465808
    Checked 26 Oct 2026 via doi.org, Crossref, PubMed
  4. Short-term high doses and seminal fluid

    Carpino et al., Andrologia, 1994

    DOI 10.1111/j.1439-0272.1994.tb00795.x PMID 7526746
    Checked 26 Oct 2026 via doi.org, Crossref, PubMed
  5. Testosterone peaks after use through the skin

    Brisson et al., Canadian Journal of Applied Physiology, 1997

    DOI 10.1139/h97-006 PMID 9018408
    Checked 26 Oct 2026 via doi.org, Crossref, PubMed
  6. Detection of testosterone esters in blood

    Forsdahl et al., Drug Testing and Analysis, 2015

    DOI 10.1002/dta.1914 PMID 26695486
    Checked 26 Oct 2026 via doi.org, Crossref, PubMed
  7. Pharmacology of anabolic steroids, review

    Kicman, British Journal of Pharmacology, 2008

    DOI 10.1038/bjp.2008.165 PMID 18500378
    Checked 26 Oct 2026 via doi.org, Crossref, PubMed

Trial registry

  1. All trials on ClinicalTrials.gov

    ClinicalTrials.gov, U.S. National Library of Medicine

    Checked 26 Oct 2026 via ClinicalTrials.gov API v2

Database

  1. Mechanism and approval in ChEMBL

    ChEMBL, EMBL-EBI (CHEMBL1170)

    Checked 26 Oct 2026 via ChEMBL

In the shop

Testosterone Propionate in the catalog

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