Testosterone therapy is not a single protocol. Dosing frequency and injection route determine whether levels remain steady and physiologic or cycle between high and low across the week — and the high points are the source of most side effects. Two decisions, more frequent dosing and the right route, account for most of that difference.
Reviewed by Dr. David Oliak, board-certified surgeon
Updated August 2026
A single weekly injection is the simplest schedule and a common default. Its limitation is the effect on blood levels.
Injected testosterone rises to a peak in the days after the injection, then declines to a trough before the next one. On a weekly schedule the difference is large — on the order of a few hundred points between peak and trough — and the peak can exceed the normal physiologic range.
The result is time spent above the optimal range early in the week and below it later, rather than a steady level. Many men report the corresponding pattern: a stronger early week followed by a decline in energy and mood as the trough approaches.
The high peaks are the source of most testosterone side effects.
When testosterone rises above the physiologic range, aromatization to estrogen increases and red blood cell production rises. The predictable consequences of a large weekly peak are elevated estrogen, elevated hematocrit, and acne or oily skin, along with the inconsistent effect across the week.
Elevated hematocrit is the most important of these. Thicker blood raises the risk of clotting, and managing it may require periodic therapeutic blood donation.
These effects are usually a function of the peak, not of testosterone therapy itself. Reducing the peak reduces them.
The corrective measure is to divide the dose and inject more often.
Splitting the weekly dose into two injections compresses the peak-to-trough range, keeps levels nearer the middle, and avoids the supra-physiologic peaks that drive side effects. The profile is more physiologic — closer to the body's own regulation — which reduces side effects and produces a consistent effect across the week.
Some men prefer three injections weekly for a still steadier profile. For most, moving from once to twice weekly is the single change that produces the largest improvement.
The trade is a small increase in injection frequency for a more stable result. In our experience most men accept it readily.
The second decision is the injection route: into muscle (intramuscular) or into the subcutaneous fat. Both are effective.
We generally prefer subcutaneous. It is more convenient, which matters as injection frequency increases, and it is straightforward to perform at home.
Subcutaneous injection also absorbs more slowly than intramuscular. The peak occurs approximately three to four days after injection, rather than one to two, which reinforces the steadiness that frequent dosing is intended to achieve.
With testosterone cypionate in MCT oil, injection-site reactions, the main drawback of subcutaneous dosing, are infrequent, and the lower-viscosity oil is easily drawn and injected through a fine 27-gauge needle.
Much of what is attributed to testosterone side effects is a consequence of once-weekly dosing: the peak is too high, the trough too low, and the body responds to both.
Dividing the dose and administering it subcutaneously in a low-viscosity oil generally produces steadier levels and, on the same weekly amount, a lower hematocrit and fewer skin effects.
This is the component of testosterone therapy that an online prescription does not provide: matching dose, frequency, and route to the individual, then adjusting from measured labs. The additional effort is minor relative to the improvement in stability and tolerability.
— Dr. David Oliak, board-certified physician and surgeon
None of these settings is fixed. The appropriate dose, frequency, and route are determined by measurement, not assumption.
We test where levels sit, including free testosterone where indicated, and adjust until the result is steady and symptoms resolve without hematocrit or estrogen moving out of range.
Administration and monitoring are two parts of the same task: maintaining optimized, safe levels over time. The testing side is covered on the free-testosterone page.
Let's begin
Whether you are on testosterone and cycling between weekly highs and lows, or starting and want it done correctly, we dose and deliver for steady levels and monitor over time. The consult is free, with in-office testosterone testing often the same day. To speak with us first, call 714-671-2005.
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Both are effective. We generally prefer subcutaneous: it is more convenient, straightforward at home, and absorbs more slowly, so levels are steadier (peak at approximately three to four days rather than one to two).
With testosterone cypionate in MCT oil, site reactions are infrequent and injection is done with a fine 27-gauge needle. Intramuscular remains a valid option.
For most men, twice weekly is preferable. A single weekly injection produces a large peak-to-trough range — often a few hundred points — with a peak that can exceed the normal range. That is the source of side effects such as elevated hematocrit and estrogen, acne, and inconsistent effect.
Dividing the dose into two or more injections compresses that range and produces steadier, more physiologic levels.
Generally, yes. Most testosterone side effects derive from supra-physiologic peaks rather than testosterone itself. More frequent dosing avoids those peaks, which tends to lower hematocrit and estrogen and reduce acne and oily skin, frequently without changing the total weekly dose.
Testosterone increases red blood cell production, and high peaks amplify this. An elevated hematocrit thickens the blood and raises the risk of clotting. It is monitored on therapy and, if elevated, may be managed with therapeutic blood donation; steadier dosing reduces the tendency.
By measurement and adjustment. We assess where levels sit, including free testosterone where indicated, and adjust dose, frequency, and route until the result is steady and symptoms resolve without hematocrit or estrogen out of range, then continue to monitor. It is individualized, not a fixed protocol.
