What isocaproate is
Isocaproate is a branched six-carbon ester that sits in the middle of the range. Most people encounter it only as a Sustanon component, which is why it draws steady search interest without many pages answering it directly. It is stocked here as a single-ester product, which is uncommon.
- Ester chain
- 6-carbon, branched
- Half-life
- Approximately 2 days.
- Testosterone fraction
- 72% by weight
- Per 100 mg of ester
- 72 mg of testosterone
- Presentation
- Oil solution for intramuscular injection.
- Storage
- Room temperature, protected from light.
Weight, and why it is not a detail
The branch in the chain distinguishes it from straight-chain caproate. Functionally it behaves as a mid-length ester: slower than phenylpropionate, faster than enanthate. In a four-ester blend it fills the window between the first two days and the point at which the decanoate fraction becomes the dominant contributor.
Where you meet it
Isocaproate draws steady search interest for an ester that is hardly ever sold alone, because people read a Sustanon label and look up the one component they do not recognise. It is stocked here as a single-ester product, which is unusual enough to be worth stating plainly.
- Sustanon 250 four at 250 mg/ml
Nearest esters
The closest reference points on the release curve.
- Quanta Pharma Testosterone Isocaproatein stock£30
Availability checked 2026-09-01. The product page carries live stock.
Common questions
Why is isocaproate hard to find on its own?
It was formulated as a blend component rather than a standalone product. Its roughly 2 day half-life sits between esters that are already well served individually, so there has been little reason to supply it alone.
What is the difference between isocaproate and caproate?
The shape of the six-carbon chain. Isocaproate is branched where caproate is straight. In practice both behave as mid-length esters; isocaproate is the one used in testosterone blends.
How much testosterone is in Testosterone Isocaproate?
About 72% by weight. 100 mg of testosterone isocaproate contains roughly 72 mg of testosterone, the remainder being the ester chain.
Does this page give dosing information for Testosterone Isocaproate?
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.