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Testosterone Cypionate: mg to mL, syringe units and half-life

Vial strengths · mg to mL · Units chart · Half-life ~8 days

What is testosterone cypionate?

Testosterone cypionate is testosterone attached to a cypionate ester and dissolved in oil, given by injection. It is one of the most common forms used for testosterone replacement therapy (TRT).

Also known as: Depo-Testosterone, Test C.

Common strengths

Depo-Testosterone comes in 100 mg/mL and 200 mg/mL strengths, in 1 mL and 10 mL vials. It is already a solution, so there is nothing to mix.

Worked example: mg to mL and syringe units

Testosterone cypionate is already a solution, so there is no mixing. The only math is turning an amount in mg into a volume. Here it is at 200 mg/mL for 100 mg.

  1. Volume to draw. 100 mg ÷ 200 mg/mL = 0.5 mL
  2. On a U-100 syringe. 0.5 mL × 100 = 50 units
The amount here is an example to show the math, not a recommendation. How much to take is a decision for you and your prescriber. Check the strength printed on your vial; the same amount is a different volume at a different strength.

Volume chart at 200 mg/mL

Amounts are examples for the conversion, not doses.
AmountVolumeU-100 syringe
50 mg0.25 mL25 units
100 mg0.5 mL50 units
150 mg0.75 mL75 units
200 mg1 mL100 units

Testosterone cypionate half-life and time to peak

  • Half-lifeabout 8 days (192 hours)
  • Time to peak (Tmax)Not listed
  • Route in Dose TrackInto muscle (intramuscular)

The FDA Depo-Testosterone label says the half-life of testosterone cypionate injected into muscle is about eight days. The label gives no time to peak, so we leave it out.

Numbers shown are the values Dose Track uses, listed only where they agree with the source above. Half-life varies from person to person and with injection site.

How to track testosterone cypionate in Dose Track

  1. Add testosterone cypionate from the built-in list. It sits next to everything else you take, so a GLP-1, TRT and a few peptides all live in one log.
  2. Save the vial strength (for example 200 mg/mL). Every amount you log then shows in mL and syringe units.
  3. Log each shot. The app subtracts it from the vial, shows what is left, and warns you before you run out.
  4. Set reminders on your own schedule, whether that is daily, weekly or every few days.
  5. Your log stays on your phone.
Testosterone EnanthateXyosted, Delatestryl Testosterone PropionateTest P · half-life about 20 hours hCG (Human Chorionic Gonadotropin)Novarel, Pregnyl · half-life about 29 hours

Frequently asked questions

How many mL is 100 mg of testosterone cypionate?+
Divide the amount by the strength on the vial. At 200 mg/mL, 100 mg is 0.5 mL. At a different strength the volume changes, so always check the label. The amount is only an example for the math, not a recommendation.
How many units on an insulin syringe is 100 mg of testosterone cypionate?+
On a U-100 insulin syringe, 1 mL is 100 units. At 200 mg/mL, 100 mg is 0.5 mL, which is 50 units. Multiply the mL by 100 to get units.
What is the half-life of testosterone cypionate?+
Dose Track uses a half-life of about 8 days (192 hours) for testosterone cypionate. The FDA Depo-Testosterone label says the half-life of testosterone cypionate injected into muscle is about eight days. The label gives no time to peak, so we leave it out.
Can I track testosterone cypionate in Dose Track?+
Yes. Testosterone cypionate is built into Dose Track. You can log each shot next to your other compounds, save the vial strength so every amount shows in mL and syringe units, see how much is left in the vial, and get reminders. Your log stays on your phone.

Sources

  1. Depo-Testosterone (testosterone cypionate) prescribing information. DailyMed.

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