What propionate is
Propionate is the shortest of the commonly supplied testosterone esters. The three-carbon chain is cleaved quickly, so the compound appears in circulation within hours of injection and clears correspondingly fast. That short curve is the defining property: it produces the sharpest peak-to-trough movement of any testosterone ester and the shortest tail once injections stop.
- Ester chain
- 3-carbon (propanoic acid)
- Half-life
- Approximately 0.8 days, often quoted as around 20 hours.
- Testosterone fraction
- 83% by weight
- Per 100 mg of ester
- 83 mg of testosterone
- Presentation
- Oil solution for intramuscular injection, commonly 100 mg/ml.
- Storage
- Room temperature, protected from light.
Weight, and why it is not a detail
Because the ester adds so little weight, propionate carries more testosterone per milligram than any other common ester. 100 mg of testosterone propionate contains roughly 83 mg of testosterone, against roughly 70 mg for enanthate. Labelled concentration and delivered hormone are therefore not the same comparison, which is the single most common source of confusion when reading across ester products.
Where you meet it
Propionate is the ester you meet when a product is labelled at 100 mg/ml rather than 250. That is not a weaker preparation, it is a different solubility problem: short esters are typically supplied at lower concentrations. It is also the only common testosterone ester absent from Test 400, which is the structural reason Test 400 has no fast fraction at all.
Nearest esters
The closest reference points on the release curve.
- Quanta Pharma Testosterone Propionatein stock£25
Availability checked 2026-09-01. The product page carries live stock.
Common questions
Why is propionate sold at 100 mg/ml when enanthate is sold at 250?
Convention and solubility rather than potency. Short esters are conventionally supplied at lower concentrations. Because propionate is about 83% testosterone against enanthate's 70%, 100 mg of propionate delivers roughly 83 mg of testosterone where 100 mg of enanthate delivers about 70.
Is propionate in Sustanon 250?
Yes. Propionate is the shortest of the four esters in Sustanon 250, at 30 mg per millilitre in the classic formulation. It is the component responsible for the blend acting within a day rather than a week.
How much testosterone is in Testosterone Propionate?
About 83% by weight. 100 mg of testosterone propionate contains roughly 83 mg of testosterone, the remainder being the ester chain.
Does this page give dosing information for Testosterone Propionate?
No. This is a reference resource covering the ester, its release profile, its weight and its storage. It does not provide dosing protocols, administration schedules or medical advice.