Oral testosterone or injections: how to choose

Same hormone, different curve

Testosterone does the same work in your body whatever the route. What changes is the shape of your blood level over time. A daily or twice-daily oral dose produces smaller rises and falls around each meal. An injection produces a rise over the following days and a gradual fall until the next dose, and the longer the gap, the bigger that swing.

Those swings matter because they shape how you feel and which side effects are most likely. Some men notice energy and mood dipping in the days before an injection. High peaks are also linked to more red blood cell production and, in some men, more conversion to estradiol.

Oral testosterone: what you gain

Older oral forms such as methyltestosterone were linked to liver problems. Today's FDA-approved oral products use testosterone undecanoate, which is absorbed through the lymphatic system along with dietary fat. The Kyzatrex label states it is not a 17-alpha-alkyl androgen and is not known to cause liver adverse effects.

• No needles, which matters a great deal to some men
• Steadier levels through the day compared with infrequent injections
• Easy to pause or adjust
• No risk of transferring testosterone to partners or children, unlike gels

Oral testosterone: what it costs you

It has to be taken with food, usually twice a day, and absorption depends on eating a meal. That suits some routines and frustrates others. Levels are checked a few hours after a morning dose, which takes some planning.

Blood pressure is the main safety focus. Oral testosterone undecanoate can raise blood pressure, and its label says it is not recommended for people with uncontrolled hypertension. The Kyzatrex boxed warning about blood pressure was removed from its label in 2025, but the blood pressure warning itself remains, and periodic monitoring is still required. Oral products are also typically more expensive than generic injections.

Injections: what you gain

Injections can be given into muscle or under the skin depending on the product. Many clinicians now favor more frequent, smaller doses to keep levels steadier.

• Long track record and well-understood effects
• Generic testosterone injections are widely available and usually lower cost
• Dosing is done weekly or less often, so you do not have to remember a daily pill
• Flexibility to fine-tune the dose and interval

Injections: what it costs you

The peak-and-trough pattern is the main drawback, especially with doses spaced two weeks or more apart. Higher peaks are associated with a greater rise in hematocrit, the share of your blood made up of red cells, which is the most common reason injections need adjusting. Some men also notice mood or energy dips before the next dose.

Needle discomfort, injection-site soreness and the need for supplies are practical hurdles. FDA's 2025 class-wide labeling update added a blood pressure warning to all testosterone products, so blood pressure is monitored with injections too.

What every route has in common

All forms of testosterone therapy signal your brain to reduce LH and FSH. That lowers your own testosterone production and sperm output, sometimes to zero. The American Urological Association advises against testosterone therapy for men trying to conceive.

Monitoring is similar too: testosterone levels, hematocrit, PSA for men over 40, blood pressure and how your symptoms respond. Diagnosis should rest on symptoms plus two low morning testosterone results, with checks for reversible causes.

Other routes worth knowing about

Oral capsules and injections are not the only choices. Gels and creams applied to the skin give fairly steady daily levels but can transfer to partners or children through skin contact, so the area must be covered and hands washed. Patches are another daily option, though skin irritation is common. Long-acting pellets placed under the skin last for months but cannot be adjusted once inserted.

Each route trades convenience against control and side-effect profile. Your clinician can explain which ones are available through your plan and how each would be monitored.

How the choice is usually made

Your clinician will consider your blood pressure and heart risk, your hematocrit history, how you feel about needles, your daily routine and cost. Men with high blood pressure may lean away from oral forms. Men whose hematocrit climbs on injections may do better with smaller, more frequent doses or another route.

HealifyMD's testosterone replacement therapy is $249 for the first month (including the lab panel), then $149/month, with no membership fee. Other labs are priced separately, and your price is confirmed at the eligibility review. Your clinician will explain which forms are suitable for you.