TRT Protocols: Dosing, Frequency, and Methods
Comprehensive guide to TRT dosing protocols, injection frequency, and how to find your optimal regimen.
Injection protocols overview
The most common TRT protocol is testosterone injections, typically testosterone cypionate or enanthate. Standard starting doses range from 100-200mg per week, but 'starting dose' is misleading — the goal is to find the lowest dose that resolves symptoms while keeping you in the physiological range. Common frequencies: once weekly (standard), twice weekly (smoother levels, fewer peaks/troughs), every 3.5 days (popular on forums), and daily micro-dosing (smoothest levels but more injections). More frequent injections generally mean more stable levels and less aromatization to estradiol.
Gels, creams, and topical options
Testosterone gels (AndroGel, Testogel) and compounded creams offer needle-free TRT but come with their own trade-offs. Advantages: steady daily levels mimicking natural rhythms, no injection pain or supplies needed. Disadvantages: risk of transfer to partners/children through skin contact, variable absorption (some men absorb poorly), daily application required, typically more expensive than injections, and often produce lower blood levels than injections. Compounded scrotal cream is gaining popularity for higher absorption and potentially higher DHT conversion.
Other delivery methods
Testosterone pellets (Testopel) are implanted under the skin every 3-6 months — convenient but surgical, with fixed dosing that can't be easily adjusted. Oral testosterone undecanoate (Jatenzo, Kyzatrex) is newer, taken twice daily with food, avoiding liver toxicity of older oral formulations. Nasal gel (Natesto) is dosed 2-3 times daily with rapid peaks — some men use this to preserve some natural function. Long-acting injections (Nebido/Aveed) are given every 10-14 weeks in a clinic setting — very convenient but large volume injections and less dosing flexibility.
Finding your optimal dose
Start low and titrate up slowly. A reasonable starting protocol: 100mg/week split into two 50mg injections, with blood work at 6-8 weeks. If levels are too low and symptoms persist, increase by 20-30mg/week and re-test in 6-8 weeks. If levels are too high or side effects occur, decrease. Most men land between 100-160mg/week. A minority need 200mg+. The ultimate measure is symptom resolution and how you feel — chasing a specific number is counterproductive. Track energy, libido, mood, gym performance, and morning erections as your personal biomarkers.
Injection techniques and supplies
You'll need: testosterone vials (typically 10mL multi-dose), syringes (1mL or 3mL), drawing needles (18-21G), and injection needles (25-27G, 1-1.5 inch for IM; 27-31G, 0.5 inch for subcutaneous). Intramuscular (IM): inject into glute (ventrogluteal is safest), thigh (vastus lateralis), or deltoid. Subcutaneous (SubQ): inject into belly fat with a short insulin needle — growing in popularity for smaller, more frequent doses with less scar tissue. Always rotate injection sites and use sterile technique. Aspiration (pulling back the plunger) is no longer recommended by most guidelines for IM injections.
Frequently asked questions
Once a week vs twice a week injections? +
Twice-weekly injections produce more stable levels with smaller peaks and troughs. This means less aromatization to estradiol, more stable mood and energy, and potentially fewer side effects. Once-a-week is simpler but can cause a noticeable drop by day 6-7 for some men. If you're experiencing mood swings or high estradiol on once-weekly, switch to twice-weekly first before adding an AI.
What gauge needle should I use? +
For IM injections, 25G 1-inch is a good balance of comfort and flow. 27G 1-inch works but draws and injects slowly. For SubQ, 29-31G 0.5-inch insulin syringes are ideal — nearly painless. Drawing with a larger needle (18-21G) then switching to a fresh smaller needle for injection is standard practice.
Can I inject SubQ instead of IM? +
Yes, subcutaneous TRT injections are effective and increasingly popular. SubQ produces slightly slower absorption and potentially lower peak levels, which can mean less aromatization. Many men report more stable mood and fewer side effects. The trade-off is slightly lower bioavailability in some studies, but clinical outcomes are comparable. Ideal for frequent, small-dose protocols.
What if I miss a dose? +
If you miss by a day, inject as soon as you remember and adjust your next dose accordingly. Don't double-dose. One missed dose won't crash your levels significantly — testosterone cypionate has a half-life of about 8 days. The bigger risk is inconsistency over time. Set calendar reminders and keep a backup vial if possible.