The Short Answer
Injections win on most metrics — cost, absorption consistency, serum stability, and physician preference. Injectable testosterone cypionate commands roughly 54% of the TRT market for good reason. However, topical creams aren't inherently inferior — they offer needle-free convenience and may produce more favorable DHT profiles for some men. The best method is the one you'll actually stick with consistently.
Cost Comparison
The cost gap between injections and topical testosterone is one of the most significant factors in this decision:
| Delivery Method | Monthly Cost Range | Annual Cost |
|---|---|---|
| Testosterone cypionate injections | $30–$150/month | $360–$1,800 |
| Topical creams/gels (brand name) | $200–$600/month | $2,400–$7,200 |
| Compounded topical cream | $50–$150/month | $600–$1,800 |
Generic testosterone cypionate is one of the most affordable prescription medications available. A 10mL vial of 200mg/mL concentration typically costs $30–$80 with a GoodRx coupon and lasts 8–10 weeks at standard doses. Brand-name topical gels like AndroGel can cost 5–10x more, though compounded creams from 503A pharmacies narrow this gap significantly.
For most men, cost alone makes injections the default choice — especially at online clinics where injectable protocols dominate.
Effectiveness and Absorption
Injectable testosterone bypasses the skin barrier entirely, delivering the compound directly into muscle tissue or subcutaneous fat. This means near-100% bioavailability — essentially all of the prescribed dose reaches your bloodstream.
Topical testosterone absorption is inherently less predictable. Studies show that transdermal gels typically achieve 10–15% absorption rates, though this varies widely based on application site, skin thickness, body hair, sweating, and even time of day. Some men absorb topicals well and achieve excellent serum levels. Others apply the same dose and barely move their numbers.
This absorption variability is the core clinical limitation of topical testosterone. With injections, your provider can predict serum levels based on the dose administered. With creams, there's significantly more trial-and-error involved in dialing in the right dose.
Serum Level Stability
Modern injection protocols — particularly the twice-weekly or every-3.5-day subcutaneous approach favored by most online TRT clinics — produce remarkably stable serum testosterone levels. The cypionate ester has a half-life of approximately 8 days, and splitting doses prevents the dramatic peak-and-trough swings that older bi-weekly injection schedules caused.
Topical creams produce a daily testosterone curve: levels rise after application and gradually decline. This can actually mimic natural diurnal testosterone patterns more closely than injections. However, missed applications or inconsistent absorption can create day-to-day variability that some men notice as energy or mood fluctuations.
Side Effect Profiles
The side effect profiles overlap significantly — both delivery methods can cause the same testosterone-related side effects (elevated hematocrit, estrogen conversion, acne). But there are some differences:
| Side Effect | Injections | Creams |
|---|---|---|
| Elevated hematocrit (polycythemia) | Higher risk (bolus dosing) | Lower risk (steadier levels) |
| Estrogen conversion | Moderate (manageable with dose splitting) | Lower (less aromatization) |
| Skin irritation | Injection site soreness | Application site irritation possible |
| Transfer to others | No risk | Significant risk if not managed |
| DHT elevation | Moderate | Higher (skin has more 5-alpha reductase) |
Injections carry slightly higher polycythemia risk because of periodic serum peaks, which stimulate erythropoiesis more aggressively. Creams tend to produce more DHT (dihydrotestosterone) due to the high concentration of 5-alpha reductase enzyme in skin tissue — which can be a positive or negative depending on your priorities.
Convenience and Lifestyle
Injections: Require needles, syringes, and a few minutes twice a week. Most men self-inject subcutaneously with insulin needles — it's virtually painless once you learn the technique. See our complete injection guide for the step-by-step process. Travel requires carrying your vial and supplies (TSA permits prescribed medications with documentation).
Creams: Applied daily, typically to the shoulders, inner thighs, or scrotum. No needles involved. However, you need to wait for the cream to dry before contact with others, avoid swimming or heavy sweating for several hours after application, and be mindful of skin-to-skin transfer risk. Some men find the daily application more annoying than twice-weekly injections.
The DHT Factor
Topical testosterone, especially when applied to scrotal skin, produces significantly higher DHT levels than injectable testosterone. DHT is a potent androgen responsible for:
- Libido and sexual function (DHT is a stronger androgen than testosterone at receptor sites)
- Beard growth and body hair
- Scalp hair loss in genetically predisposed men
- Prostate tissue stimulation
Some men specifically choose scrotal cream because the elevated DHT improves libido and sexual function beyond what injections alone provide. Others avoid it because of hair loss concerns. If DHT levels matter to you, discuss this with your provider when choosing a delivery method.
Transfer Risk With Creams
This is the single most critical safety distinction between delivery methods. If you live with a partner, children, or frequently have close physical contact, you need strict protocols: apply to covered areas, wash hands immediately, cover the application site with clothing, and wait several hours before direct skin contact. Many men find that these precautions are more burdensome than simply injecting.
When Creams Make Sense
Despite injections being the default recommendation, topical testosterone is the better choice for some men:
- Severe needle phobia that doesn't respond to desensitization
- Men who want elevated DHT for libido or sexual function improvements
- Patients with high hematocrit who need a delivery method less likely to spike red blood cell production
- Men who've tried injections and had persistent side effects despite protocol optimization
Comparison Table
| Factor | Injections | Creams/Gels |
|---|---|---|
| Cost | $30–$150/mo ✅ | $50–$600/mo |
| Absorption reliability | Near 100% ✅ | ~10–15%, variable |
| Serum stability | Excellent (2x/week) | Good (daily application) |
| Needles required | Yes | No ✅ |
| Transfer risk | None ✅ | Significant |
| DHT production | Moderate | Higher (especially scrotal) |
| Polycythemia risk | Moderate-High | Lower ✅ |
| Application frequency | 2x/week | Daily |
| Patient satisfaction | High | High |
For most men starting TRT, injectable testosterone cypionate administered twice weekly is the optimal starting point: it's affordable, highly effective, well-studied, and gives your provider precise control over dosing. If injections don't work for you, topical options are a legitimate Plan B with their own unique advantages.
Ready to find a clinic? Most top-rated online TRT providers offer both delivery methods, though their injectable protocols tend to be more developed and cost-effective.