Oral testosterone is effective at raising testosterone levels into the normal range for most men with diagnosed testosterone deficiency. Modern formulations, approved by the FDA starting in 2019, use a different chemical structure than older oral versions and work through a distinct absorption pathway that avoids the serious liver problems that gave oral testosterone a bad reputation for decades.
That said, “effective” comes with some important context. How well it works depends on when and how you take it, and it carries a few trade-offs compared to injections or topical gels.
Why Oral Testosterone Had a Bad Reputation
The earliest oral testosterone products used a chemical modification called 17-alpha alkylation to survive digestion. The most well-known was methyltestosterone. This modification kept the hormone intact long enough to reach the bloodstream, but it forced the entire dose through the liver first. Over time, the liver damage was significant. In a study of 60 patients on long-term methyltestosterone, about one-third had abnormal liver function tests, and nearly two-thirds showed abnormalities on liver scans, especially after more than a year of use. Biopsy samples revealed structural changes to liver tissue, and one patient developed a liver tumor.
These 17-alpha alkylated steroids were specifically linked to bile flow blockages, blood-filled cysts in the liver (peliosis hepatis), and liver tumors. For years, this meant doctors avoided prescribing oral testosterone entirely, favoring injections or topical gels instead.
How Modern Oral Testosterone Works Differently
The current generation of oral testosterone uses a compound called testosterone undecanoate, which takes a completely different route into the body. Instead of passing through the liver, it gets absorbed through the lymphatic system, the same network of vessels your body uses to transport dietary fats. Roughly 84% of the testosterone that reaches your bloodstream from these capsules arrives via this lymphatic pathway, effectively bypassing the liver’s first-pass metabolism that destroyed plain oral testosterone and caused the liver damage seen with older formulations.
Once testosterone undecanoate enters the bloodstream through the lymphatic system, enzymes break it down into regular testosterone. The end result is the same hormone your body produces naturally, just delivered through a different door.
Available Brands and How They’re Taken
Two FDA-approved oral testosterone undecanoate products are currently available in the U.S.: Jatenzo and Tlando. Both are taken twice daily, once in the morning and once in the evening. Jatenzo comes in capsules of 158, 198, or 237 mg, with most patients starting at 237 mg twice daily. Tlando uses a 225 mg capsule taken twice daily.
One practical detail that directly affects how well these medications work: you need to take them with food, specifically a meal containing fat. Fat is what triggers the lymphatic absorption pathway. Taking the capsules on an empty stomach significantly reduces how much testosterone actually reaches your bloodstream. A normal meal with some fat content is sufficient. You also need to swallow the capsules whole without chewing them.
This food requirement is probably the biggest practical difference between oral testosterone and other delivery methods. If you tend to skip breakfast or eat irregularly, the twice-daily-with-meals schedule may be harder to stick with, and inconsistent dosing means inconsistent testosterone levels.
How Effective Is It Compared to Other Forms?
In clinical trials, oral testosterone undecanoate successfully raised serum testosterone into the normal range for the majority of men with hypogonadism. It performs the same basic job as injections and topical gels: restoring testosterone to mid-normal levels and improving symptoms like low energy, reduced sex drive, and loss of muscle mass.
The main differences between delivery methods are practical, not about whether they work. Injections (typically given every one to two weeks) produce higher peak levels that gradually decline, creating a “roller coaster” pattern some men notice. Topical gels provide steady daily levels but carry a risk of transferring testosterone to partners or children through skin contact. Oral capsules offer convenience and avoid the transfer risk, but require the twice-daily meal timing described above.
Blood Pressure: The Key Safety Consideration
The most notable side effect specific to oral testosterone undecanoate is a modest increase in blood pressure. In the phase 3 clinical trial for Jatenzo that used 24-hour blood pressure monitoring, systolic pressure (the top number) rose by an average of 4.9 mmHg, and diastolic pressure (the bottom number) rose by 2.5 mmHg. For comparison, patients using a topical testosterone product in the same trial saw a smaller systolic increase of about 1.8 mmHg.
The increase was more pronounced in men who already had high blood pressure. Those patients saw average increases of 5.5 mmHg systolic and 3.2 mmHg diastolic. A 5 mmHg rise may not sound like much, but over years it can meaningfully affect cardiovascular risk, especially if your blood pressure is already borderline or elevated. This is something worth tracking if you’re on oral testosterone.
What Monitoring Looks Like
After starting oral testosterone, you’ll typically have blood work done at the 3 to 6 month mark to check whether your testosterone levels have reached the target range. If they haven’t, your dose can be adjusted. After that, annual blood tests are standard.
Beyond testosterone levels, your doctor will check your hematocrit (a measure of red blood cell concentration) at baseline, again at 3 to 6 months, and then yearly. Testosterone stimulates red blood cell production, and levels that climb too high can thicken the blood and increase the risk of clotting. For men over 40 with risk factors for prostate cancer, or men 55 to 69 generally, a prostate-specific antigen (PSA) test and digital rectal exam are recommended before starting treatment and again within the first year.
Symptom improvement is just as important as the numbers. Your doctor will evaluate at 3 to 12 months whether the issues that led to treatment, such as fatigue, low libido, or mood changes, have actually improved. If testosterone levels look normal on paper but you feel no different, the treatment plan may need to change.
Who It Works Best For
Oral testosterone tends to be a good fit for men who want to avoid needles, who don’t want the skin-contact risks of gels, or who simply prefer the convenience of a pill. It’s a reasonable first-line option for testosterone replacement in men with confirmed deficiency. The twice-daily schedule with meals is the main commitment, and for men who eat regular meals, it’s straightforward.
It may be a less ideal choice for men with existing high blood pressure or significant cardiovascular risk factors, given the blood pressure signal seen in trials. It’s also not appropriate for men who eat very low-fat diets or have conditions that impair fat absorption, since the lymphatic pathway depends on dietary fat to function properly.