Testosterone Cypionate 250mg/ml
Testosterone Cypionate (Test C)
Testosterone Cypionate, also known as Test C, is a long-acting injectable testosterone commonly used for testosterone replacement therapy (TRT), muscle building and bodybuilding. Test C has an intramuscular half-life of approximately eight days, which makes once- or twice-weekly injection schedules practical for most users.[1]
250mg/ml
10ml
2,500mg
Cat Pharmaceuticals
Quick reference
Testosterone Cypionate Dosage
80–120mg
Per week
200–250mg
Per week
300–500mg
Per week
500mg+
Per week
How often? Once or twice per week is the most common Test C schedule. Many users split the weekly amount into two injections to keep the routine consistent. Pharmaceutical labeling confirms that Testosterone Cypionate is absorbed slowly from the intramuscular oil depot and has an approximate eight-day half-life.[1]
| Amount | Test C at 250mg/ml |
|---|---|
| 100mg | 0.4ml |
| 125mg | 0.5ml |
| 250mg | 1ml |
| 500mg | 2ml |
Duration
Test C Cycle Length
Standard bodybuilding cycle: 10–12 weeks
Longer muscle-building cycle: 12–14 weeks
TRT: long-term use based on testosterone levels and bloodwork
Injection schedule
Once or Twice Per Week
Because Test C is long acting, daily injections are not normally needed. Once-weekly and twice-weekly schedules are both common.
For TRT, the weekly amount is often adjusted using testosterone levels and bloodwork rather than choosing the dose from a fixed chart alone.
The comparison most users ask about
Test C vs Test E
Testosterone Cypionate and Testosterone Enanthate are very similar long-acting forms of testosterone and are used in much the same way for TRT and bodybuilding.
Test C has a slightly longer half-life. U.S. prescribing information gives Testosterone Cypionate an intramuscular half-life of approximately eight days, while human pharmacokinetic research shows Testosterone Enanthate clears somewhat faster.[1][2]
| Test C | Test E | |
|---|---|---|
| Type | Long acting | Long acting |
| Release | Slightly slower | Slightly faster |
| Typical frequency | 1–2 times/week | 1–2 times/week |
| Common uses | TRT, muscle, strength | TRT, muscle, strength |
In practical use, the difference is small. Both are long-acting testosterone esters and both are commonly used with the same once- or twice-weekly type of schedule. Test C is simply the slightly longer-acting option.
Common combinations
Test C Stacks
Test C is commonly used as the testosterone base of a cycle.
Muscle / size: Deca, Dianabol, Primobolan
Leaner cycles: Masteron, Anavar, Trenbolone
After a cycle
PCT After Test C
If Test C is being used as a cycle and testosterone is stopped completely, PCT is commonly started after the long ester has had time to clear.
A common starting point is around two weeks after the final Test C injection.
Independent product testing · July 2026
Test C Lab Report
The current Testosterone Cypionate report was issued on 16 July 2026. The Cat Pharmaceuticals sample was independently tested by OnSet Labs using RP-HPLC-UV.
OnSet Biological Testing Laboratory
26-172610
16 July 2026
NKS0226
Testosterone Cypionate (RP-HPLC-UV)
254.12mg/ml
Specification: NLT 250mg/ml
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Storage
How to Store Test C
Keep Testosterone Cypionate at normal room temperature and away from direct sunlight.
If the oil becomes cloudy or crystals appear after cold storage, allow the vial to return to room temperature. Pharmaceutical labeling notes that warming and shaking can redissolve crystals caused by cold storage.[1]
Thailand delivery
Ordering Test C in Thailand
Free shipping within Thailand. Orders are normally shipped within 24 hours.
We ship throughout Bangkok, Pattaya, Phuket, Chiang Mai, Koh Samui and provincial Thailand.
Sources
Testosterone Cypionate Sources
- U.S. Food and Drug Administration. Testosterone Cypionate Injection prescribing information. The label describes slow absorption from the intramuscular oil depot and an approximate eight-day half-life. View FDA prescribing information
- Sokol RZ, Palacios A, Campfield LA, Saul C, Swerdloff RS. Comparison of the kinetics of injectable testosterone in eugonadal and hypogonadal men. Fertility and Sterility. 1982;37(3):425–430. View on PubMed
Written by
Adrian
Adrian writes practical, experience-led content covering testosterone, bodybuilding cycles, performance enhancement and the fitness industry in Thailand. On this page, the focus is Test C dosage, injection frequency, how it compares with Test E, PCT, storage and the current independent batch test.
Thank you for such a great service! Customer service are incredibly quick to resolve any and all problems.
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