If you're exploring testosterone replacement therapy, it's helpful to understand the different options that exist. The main categories include:
Injections and topical applications are the most widely used methods, accounting for the majority of TRT prescriptions.
How does it work? Injectable testosterone involves administering an oil-based testosterone solution into muscle tissue—typically in the thigh, glute, or shoulder area. The body gradually absorbs the testosterone from the muscle into the bloodstream.
Why is it popular? Injections have been a mainstay of TRT since the 1950s and remain one of the most reliable options. They're generally cost-effective, with generic versions widely available, and have decades of safety data.
What types are most common? The two most frequently prescribed forms are testosterone enanthate and testosterone cypionate. Both are modified versions of testosterone with an "ester" molecule attached, which slows absorption and extends the medication's duration in the body. Each injection typically maintains testosterone levels for 2-3 weeks.
How often are they given? Common dosing schedules include once weekly (100 mg) or every two weeks (200 mg). Weekly injections tend to provide more stable testosterone levels with fewer fluctuations. Some patients prefer even more frequent injections (twice weekly) with adjusted doses for greater stability.
Are there longer-acting options? A newer injectable called testosterone undecanoate (Aveed) only requires administration once every 10 weeks, which some patients find more convenient.
What are the considerations?
How do they work? Testosterone gels are applied to the skin daily, usually on the shoulders, upper arms, or abdomen. The testosterone absorbs through the skin and enters the bloodstream throughout the day.
What are the advantages? Topical applications more closely mimic the body's natural testosterone release pattern, resulting in steadier levels throughout the day. Dosing is also easy to adjust as needed.
How much is typically applied? Gels come in various strengths and deliver anywhere from 25 to 100 mg of testosterone per day, depending on individual needs.
What should you know?
What is it? This is a gel applied inside each nostril three times daily. It's a relatively new option in the TRT landscape.
What are the pros and cons? Advantages:
Considerations:
How do they work? Lozenges are placed under the tongue or against the gums and release testosterone that's absorbed through the mouth's mucous membranes. Each lozenge lasts about 12 hours, requiring two applications daily—one in the morning and one in the evening.
What makes them different? Unlike oral testosterone pills that are swallowed and pass through the liver, lozenges are absorbed directly through the gums, which significantly reduces potential liver concerns.
What are the trade-offs? Advantages:
Considerations:
How do they work? Small pellets (about 3mm x 9mm) are implanted under the skin in the lower abdomen or upper buttock area during a brief office procedure using local anesthesia. The pellets slowly dissolve and release testosterone over 3-6 months.
What are the benefits?
What should you consider?
What is it? Oral testosterone refers to testosterone medications that are swallowed in pill form. While there are currently no widely available FDA-approved oral testosterone formulations for TRT in the United States, this category also includes medications that stimulate the body's own testosterone production.
Direct Oral Testosterone Traditional oral testosterone pills that are swallowed must pass through the liver, which can pose risks of liver toxicity. This is why they haven't gained widespread FDA approval in the U.S. for testosterone replacement therapy. The liver breaks down much of the testosterone before it reaches the bloodstream, making it less effective and potentially harmful with long-term use.
There have been attempts to develop safer oral formulations (such as testosterone undecanoate, marketed under names like Jluxtree or Kyzatrex), which use special delivery systems to reduce liver exposure. Some of these have been approved in other countries or gained limited approval, but adoption remains limited due to concerns about effectiveness and liver safety.
Who might prefer oral options? Patients who are uncomfortable with injections, don't want to deal with daily topical applications, or prefer the convenience of taking a pill often seek oral alternatives.
What are they? Clomiphene citrate (commonly known by the brand name Clomid) and enclomiphene are oral medications that work differently from direct testosterone replacement. Instead of providing testosterone directly, they stimulate your body to produce more of its own testosterone naturally.
How do they work? These medications block estrogen receptors in the brain, which tricks your body into thinking estrogen levels are low. In response, your brain signals the testicles to produce more testosterone. This is called "selective estrogen receptor modulation."
What's the difference between Clomiphene and Enclomiphene? Clomiphene (Clomid) is actually a mixture of two molecules: enclomiphene and zuclomiphene. Enclomiphene is the active component that stimulates testosterone production, while zuclomiphene can linger in the body longer and may contribute to side effects. Enclomiphene, as a standalone medication, contains only the active component, which may result in fewer side effects and more consistent results for some patients.
Who is a good candidate for Clomiphene or Enclomiphene? These medications work best for men who:
Who is NOT a good candidate? Clomiphene or enclomiphene may not work well for:
What are the benefits?
What are the considerations?
Typical dosing: Clomiphene is usually prescribed at doses ranging from 25 mg to 50 mg taken every other day or daily, depending on individual response and testosterone levels. Enclomiphene is typically dosed at 12.5 mg to 25 mg daily or every other day.