About InjectBuddy
InjectBuddy exists for one reason: to make dosing less confusing. Instead of guessing at volumes and counting tiny syringe marks, you get clear numbers, realistic visuals, and a simple way to sanity-check your plan.
What Is Testosterone Replacement Therapy (TRT)?
Testosterone Replacement Therapy (TRT) is a medical treatment for people with clinically low testosterone. The aim is not body-building doses, but restoring levels into a healthy range so day-to-day life feels more stable: energy, mood, sleep, libido, and recovery can all be affected.
Most modern TRT protocols use injectable testosterone attached to an ester. The ester controls how quickly the hormone leaves the injection site, how long it stays active in the body, and how often injections are needed.
TRT should always be prescribed, monitored, and adjusted by a qualified clinician. InjectBuddy does not replace medical care.
Key Testosterone Esters Explained
Different testosterone esters all deliver the same hormone, but with different speed and smoothness. In practice, that means different injection schedules and slightly different “feel” between doses.
Testosterone Cypionate
Testosterone cypionate is one of the most commonly used esters in TRT. It has a relatively long half-life (roughly 7–8 days), so many protocols use once- or twice-weekly injections. When doses are sensible and spaced well, it provides a fairly smooth, gradual release.
Testosterone Enanthate
Enanthate is very similar to cypionate. Its half-life is slightly shorter (about 5–7 days), but in real life most people experience them as nearly interchangeable. The main differences are often the brand, the carrier oil, and what’s available in a particular country.
Testosterone Propionate
Propionate is a short-acting ester with a half-life around 2–3 days. It peaks and clears faster, which usually means more frequent injections (for example, every other day). Some people prefer the tighter control, but it can mean more injection site irritation and more needle time.
Blends and Long-Acting Options
Some products combine multiple esters (for example, blends designed to give both a quick rise and a slower tail). There are also very long-acting options such as testosterone undecanoate, where injections may be spaced weeks apart. These are generally managed closely in a clinic setting and are less common in self-administered protocols.
Why Dosing and Frequency Matter
The same weekly milligram total can feel very different depending on how it is split. Large, infrequent doses tend to create high peaks and low troughs, which can translate into swings in mood, energy, and side-effects.
- Shorter esters and smaller, more frequent injections can smooth out peaks and troughs.
- Longer esters allow fewer injections but need careful planning to avoid big swings.
- Lab work and symptoms should drive any changes — not guesswork or internet “bro science”.
Your actual protocol should always be agreed with your prescriber. Tools like InjectBuddy are there to help you understand the math behind what you’ve been told to do, not to set the protocol for you.
Where InjectBuddy Fits In
InjectBuddy is a calculator and visual aid. You input what your clinician has prescribed — vial strength, total weekly dose, and injection frequency — and the tool converts milligrams into milliliters, then shows approximately how that should look in a syringe.
- Convert mg → mL for any common concentration.
- Compare per-week vs every-N-days schedules.
- See how much volume you’re actually drawing into a 0.3, 0.5, 1 mL, or 3 mL syringe.
The goal is simple: fewer mistakes, less second-guessing, and a clearer picture of what each dose really is in practical terms.
InjectBuddy never tells you what dose to take. It only helps you interpret and apply the instructions you already have.