Which route suits whom
Kyzatrex suits men who want testosterone therapy without needles, eat regular meals at predictable times, and have blood pressure that is normal or well controlled. Injections suit men who are comfortable with a needle, or happy to have one given in clinic, and who value a dose that can be fine-tuned quickly. Kyzatrex’s label does not recommend it for men whose high blood pressure is uncontrolled, so that comes first.
Both routes deliver the same hormone and both need the same baseline labs. The real differences are in daily routine, blood pressure follow-up and how easily the dose moves.
Kyzatrex and injections side by side
| Kyzatrex (oral testosterone undecanoate) | Testosterone injections | |
|---|---|---|
| How you take it | Capsule twice daily with food | Shot into muscle or under the skin on a set schedule |
| Needles | None | Yes, at home or in clinic |
| Blood pressure | Label warns of increases; not recommended with uncontrolled hypertension | Class label also warns of increases; periodic checks |
| Changing the dose | New capsule strength, then a repeat level about 7 days later | Draw a different volume from the same vial |
| Blood level pattern | Rises after each dose, twice a day | Peak a few days after a shot, then a slow decline |
| Hematocrit | Label calls for checks about every 3 months | Injectables are linked to the largest hematocrit rises |
| Main daily demand | Remembering two doses with meals | Remembering the injection day |
How the capsule and the shot work
Kyzatrex contains testosterone undecanoate in a capsule absorbed through the gut’s lymphatic system, which is why it is taken with food. The Kyzatrex label gives a starting dose of 200 mg in the morning and 200 mg in the evening, with a range from 100 mg once daily up to 400 mg twice daily. Your provider sets and adjusts that dose; it is listed here only so you know what the label describes. The label also notes that Kyzatrex is not interchangeable with other oral testosterone undecanoate products.
Injectable testosterone is an ester, most often cypionate or enanthate, dissolved in oil. It forms a depot in the muscle or fat that releases testosterone over days. The testosterone cypionate label lists a broad range of 50 to 400 mg every two to four weeks, and in practice clinicians often split doses into smaller, more frequent shots to smooth out peaks. Our testosterone injections page explains the schedules.
Blood pressure: what changed on the label
Until 2025, Kyzatrex carried a boxed warning about blood pressure increases. In February 2025 the FDA announced class-wide labeling changes for testosterone products: product-specific blood pressure findings for products with ambulatory monitoring studies, a new blood pressure warning for products that lacked one, and removal of the boxed language on adverse cardiovascular outcomes. The Kyzatrex label lists the blood pressure boxed warning as removed in July 2025.
The warning itself stayed. In the label’s ambulatory monitoring study, Kyzatrex raised average systolic and diastolic pressure by 1.7/0.6 mm Hg after 4 months, and by 3.4/0.7 mm Hg in men already taking blood pressure medicines. Those averages are small, but the label notes that blood pressure increases can raise cardiovascular risk over time, so it asks for periodic checks and advises against use in uncontrolled hypertension. The cypionate label now carries a similar warning for injections. Our article on whether TRT can raise blood pressure covers what to watch at home.
Dosing changes and lab timing
This is where injections have a practical edge. Moving an injected dose up or down means drawing a different amount from the same vial, and the change shows on labs once levels settle over several injection cycles. The AUA guideline advises measuring testosterone on short-acting injections after several cycles, once levels have equilibrated.
Kyzatrex adjustments follow a set path. The label calls for a testosterone level 7 days after starting or changing the dose, drawn 3 to 5 hours after the morning capsule, and dose steps follow a table based on that result. It is precise, but it depends on the blood draw landing in that window. The page on taking Kyzatrex with food explains why meals matter for those numbers.
Side effects beyond blood pressure
Both routes share the class warnings: a rise in red blood cells, possible worsening of urinary symptoms from an enlarged prostate, fluid retention, sleep apnea in men at risk, and reduced sperm production. The Kyzatrex label states it may cause azoospermia, meaning no sperm in the semen, and the same suppression happens with injections.
Injections add site soreness and, because of the post-injection peak, the AUA guideline links them to the largest hematocrit increases. Kyzatrex trades that for a twice-daily commitment that is easy to miss on busy days. If liver safety worries you, our answer on whether oral testosterone is bad for the liver explains why modern oral undecanoate differs from older oral androgens.
Choosing between them at Ultimate Male
Your provider looks at three things before recommending a route: two low morning testosterone results with symptoms that fit, your blood pressure history and current medicines, and how you live day to day. A man who travels constantly and eats irregularly may do better with a weekly shot. A man who dreads needles and eats breakfast and dinner at home may prefer Kyzatrex oral testosterone.
Your provider reviews blood pressure at visits, and readings you take at home add useful detail. Labs are drawn on site in San Gabriel and Downey. Ultimate Male is direct-pay; the Kyzatrex cost page explains what affects the total, and the clinic quotes your plan before you start. To weigh all the routes together, see our overview of testosterone therapy or compare injections and pellets.
