How many units is 100 mg of Testosterone Cypionate at 200 mg/mL?

At 200 mg/mL, 100 mg of Testosterone Cypionate is 0.5 mL, which reads 50 units on a 100-unit insulin syringe (each unit holds 2 mg).

How many mL is 50 mg of Testosterone Cypionate?

0.25 mL at 200 mg/mL, or 25 units on a U-100 insulin syringe. At 100 mg/mL the same dose is 0.5 mL, so check the strength printed on your vial.

Do I add bacteriostatic water to Testosterone Cypionate?

No. Testosterone Cypionate comes premixed in oil at the strength printed on the label, so there is nothing to reconstitute. The calculator only needs the strength and the dose.

How often is Testosterone Cypionate taken?

2x weekly. Same days each week (e.g. Mon/Thu), any time.

Informational use only — not medical advice. Dosify Me is a reference and math tool, not a licensed healthcare provider. For adults 21 and over. Always consult a qualified healthcare professional before making decisions about medications or supplements.

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Testosterone Cypionate

Sexual Health & Hormonal Growth Hormone & Muscle

Premixed in oil, usually 200mg/mL (also 100mg/mL) in 1mL or 10mL vials — Dosing: set by your prescriber (label range 50-400mg every 2-4 weeks; weekly TRT totals of 100-200mg are common, often split into 2 injections) — Frequency: 2x weekly — Best taken: same days each week (e.g. Mon/Thu), any time

Informational only, not medical advice. Consult a licensed healthcare provider before starting or changing any protocol.

Strength and draw

Premixed in oil, so there is nothing to reconstitute and no bacteriostatic water to add. Read the strength from the vial label (100, 200 or 250 mg/mL are common). The table uses 200 mg/mL, where one unit on a U-100 insulin syringe holds 2 mg.

Dose	mL at 200 mg/mL	Syringe units
Daily or every other day
15 mg	0.075 mL	7.5 units
20 mg	0.1 mL	10.0 units
25 mg	0.125 mL	12.5 units
30 mg	0.15 mL	15.0 units
40 mg	0.2 mL	20.0 units
2-3 times a week
50 mg	0.25 mL	25.0 units
60 mg	0.3 mL	30.0 units
70 mg	0.35 mL	35.0 units
75 mg	0.375 mL	37.5 units
80 mg	0.4 mL	40.0 units
Once a week
100 mg	0.5 mL	50.0 units
120 mg	0.6 mL	60.0 units
140 mg	0.7 mL	70.0 units
150 mg	0.75 mL	75.0 units
160 mg	0.8 mL	80.0 units
200 mg	1 mL	100.0 units

Typical range: 50–200 mg. Frequency: 2x weekly. Timing: same days each week (e.g. Mon/Thu), any time.

Premixed in oil, not reconstituted. The strength comes from the vial label (usually 200mg/mL); at 200mg/mL one U-100 syringe unit is 2mg. Store at room temperature — refrigeration can crystallise it.

Storage

Store at room temperature, 20-25°C (68-77°F), away from light. Do not refrigerate: cold can make it crystallise. If crystals appear, warming and shaking the vial should dissolve them.

What it does

The most commonly prescribed injectable testosterone in the US, used for testosterone replacement therapy (TRT) in men with low testosterone.
Testosterone attached to a cypionate ester and dissolved in cottonseed oil, which releases it slowly; the label puts its half-life at about 8 days.
Many TRT patients inject it under the skin (subQ) with an insulin syringe in smaller, more frequent doses, which keeps levels steadier than one large dose every 1-2 weeks.
Prescription-only and a Schedule III controlled substance in the US. It comes premixed — there is nothing to reconstitute.

Why it is listed under Sexual Health & Hormonal, Growth Hormone & Muscle

Sexual Health & Hormonal: Replaces testosterone itself, the main male sex hormone, in men with clinically low levels.
Growth Hormone & Muscle: Testosterone replacement increases lean mass and strength in clinical trials of men with low testosterone.

Side effects

Higher hematocrit (thicker blood) — the most common reason doses get changed.
Acne, oily skin, fluid retention, or breast tenderness if estradiol rises.
Smaller testes and lower sperm count while on it; fertility can take months to return after stopping.
Redness or a small lump at the injection site, more common with subQ injections of oil.

Medication caution

Testosterone can raise the effect of blood thinners like warfarin (INR needs closer monitoring) and can lower blood sugar in people on insulin or diabetes medication. It raises hematocrit and suppresses the body's own testosterone and sperm production. Regular blood work (hematocrit, PSA, estradiol, lipids) is part of any TRT prescription — use it only under a prescribing doctor.

Sources

Figures generated from the Dosify Me compound database on 2026-09-29. Informational use only — not medical advice.