TRT
What it’s used for
TRT is testosterone replacement therapy — a hormone, not a peptide — given as injections, skin gels, oral products or a nasal spray. It's approved for specific forms of male hypogonadism, and people use it to restore testosterone and improve sexual symptoms, mood, energy, muscle and bone. Evidence comes from human trials; in the TRAVERSE safety trial, major heart events were 7.0% versus 7.3% on placebo.
- Restores testosterone Approved use Approved for specific forms of male hypogonadism, such as certain structural or genetic causes.
- Sexual health, mood & energy Community reports Used to improve sexual symptoms, mood and energy in men with low testosterone.
- Muscle, fat & bone Community reports Used for lean mass, strength, fat loss and bone density.
- Metabolic health Community reports Explored for insulin sensitivity and heart health; the benefit isn't universal.
What to expect
- Weeks 3–6
Symptoms start to improve
- Months 2–3
Fuller symptom recovery
- Months 3–6
Body-composition changes
- Months 6–12
Bone changes; timing depends on route and diagnosis
Side effects & safety
Side effects
- Higher blood pressure — the FDA requires a warning on testosterone products
- More atrial fibrillation, acute kidney injury and pulmonary embolism (lung clots) were seen in the TRAVERSE trial
- Lower fertility
- Fluid swelling (edema), acne or hair changes, and sleep-apnea concerns
- Nasal products can injure the nose
- Gels can rub off on people you touch, which can cause masculinizing effects in household members
Stop and get help if
- Signs of a blood clot (VTE)
- Shortness of breath or swelling
- Big changes in mood or blood pressure
- A high hematocrit on blood work
- Severe injection- or application-site reactions
- Signs of masculinization in a household member
Which symptoms mean call 911 or see a doctor
What regulators say
- In 2025 the FDA removed boxed-warning language about heart risk but added blood-pressure warnings.
- An April 2026 FDA announcement invited applications for low libido with idiopathic hypogonadism; it isn't an approval.
- In June 2026 the FDA requested label updates dropping the age-related-hypogonadism limit and revising prostate/BPH safety wording.
Avoid or check first if
- Unmonitored use — treatment involves blood pressure, hematocrit and prostate/hormone checks
- Above-normal (supraphysiologic) doses — trial safety results don't cover them
- Trying to have children — TRT may suppress fertility, and fertility plans need specialist care
- Taking blood thinners — their effect may change; monitor
- Taking insulin — testosterone can affect glucose; monitor
In sport
Banned at all times. Testosterone is named in S1.1 and banned at all times. Prescribed TRT needs an exemption that meets all four conditions.
Which peptides are banned in sport
How much people take
Injectable
Injectable
- Standard TRT Weekly or split 2×/week · under the skin or into muscle 100–200 mg
- Conservative start Weekly · under the skin or into muscle 75–100 mg
- Stable levels (split) Every 3.5 days · under the skin preferred 50–100 mg
- With hCG (fertility) T weekly, hCG 2–3×/week · under the skin or into muscle 100–150 mg + 250–500 IU hCG
Similar doses appear in 2 other sources
Oral
For every goal: Oral
- Jatenzo standard Twice daily with food · with fat-containing meal 237 mg
- Jatenzo dose range Twice daily · titrate based on levels 158–396 mg
- TLANDO Twice daily with food 225 mg
Similar doses appear in 2 other sources
Nasal
- Standard Natesto 3× daily (every 6–8 hours) · Nasal · Ongoing therapy 11 mg per nostril
Similar doses appear in 1 other source
Topical
- AndroGel 1% Once daily · Shoulders, upper arms 50–100 mg
- AndroGel 1.62% Once daily · Shoulders, upper arms 40.5–81 mg
- Compounded cream Once or twice daily · Scrotum or shoulders 100–200 mg
In studies & labels
- Cardiovascular safety in hypogonadism Daily · Transdermal · Mean treatment 21.7 months Monitored clinical trial; not an injectable protocol. 1.62% gel, adjusted to testosterone 350–750 ng/dL
How to store it
How many units do I draw?
Injectable
Injectable
Room temp · 20–25°C Don't refrigerate or freeze
Ready to use
The injectable form doesn’t need mixing.
Is it OK to use?
Good signs
- Clear oil solution
Don’t use if
- Crystallized or cloudy solution
Injecting under the skin Where, rotating sites, which syringe
- Where: belly (at least 2 in / 5 cm from the navel), front of the thigh, or back of the upper arm.
- Rotate sites each time and skip bruised, scarred or sore skin.
- Syringe: most people use a U-100 insulin syringe with a short, thin needle (29–31 gauge, 8 mm or shorter).
- How: wipe with alcohol and let it dry, pinch the skin, go in at 45–90°, push slowly. Use each syringe once.
General practice for under-the-skin injections, not specific to TRT.
The full guide: how to inject safely
Oral
Room temp
Ready to use
The oral form doesn’t need mixing.
Nasal
Room temp · upright
Ready to use
The nasal form doesn’t need mixing.
Topical
Room temp · no heat/flame Gels contain flammable alcohol; keep away from heat and flame
Ready to use
The topical form doesn’t need mixing.
Combining it with others
AI assessment Based on how each compound works, not on studies of the combination. How we assess
Use caution 1
- Insulin or diabetes medicines Testosterone can lower blood sugar, so doses may need adjusting.
Often taken together 1
- HCG Often prescribed with TRT to keep the testes working and protect fertility.
Can be combined 8
- Kisspeptin Acts upstream, on the brain’s signal to the testes. Combining with TRT is not well studied.
CJC-1295 (no DAC) CJC-1295 with DAC Sermorelin Tesamorelin Ipamorelin GHRP-6 Hexarelin
What the research says
Large human trials
Testosterone replacement has established clinical use and large outcomes trials in men with diagnosed deficiency. That evidence does not establish benefits from performance-enhancement use.
- TRAVERSE studied selected men with low testosterone using a gel; results may not apply to every product or route.
- Meeting the heart-safety target in TRAVERSE doesn't make treatment risk-free.
- Injectable, oral, gel and nasal products aren't interchangeable; each has its own label, exposure profile and interactions.
- Blanket claims that one route is best, or about protecting fertility, aren't supported.
- Compounded and underground-lab products vary in quality; crystallized or cloudy oil is a warning sign.
What studies found
- Safety labeling changed in 2025 FDA removed cardiovascular-outcome boxed-warning language after reviewing TRAVERSE, while requiring warnings that testosterone products can increase blood pressure.
- 2026 announcement is not a new approval FDA encouraged applications for low libido with idiopathic hypogonadism; substantial evidence is still required before approval.
- TRAVERSE defines a specific population Major cardiovascular events occurred in 7.0% versus 7.3% with placebo, meeting noninferiority. Higher rates of atrial fibrillation, acute kidney injury and pulmonary embolism remained relevant.
- FDA current testosterone information FDA reports June 2026 requested updates removing the age-related-hypogonadism limitation of use and revising prostate/BPH safety language. Indications and contraindications still require the current specific product label.
How long it stays in your body
Half-life is how fast the level in your body halves — not how long effects last or how often to dose.
- Half-life
- About 8 days
- Mostly cleared
- 40 days ≈97% gone after 5 half-lives
Human data Intramuscular (testosterone cypionate)
50% left in the body
8 d after a dose
Drag to see how much is left over time.
What it’s made of
- Length
- Steroid hormone (not a peptide)
- Molecular weight
- 288.4 Da
- Formula
- C 19 H 28 O 2
Not a peptide, so there is no amino-acid sequence.
TRT includes multiple formulations and esters; this is the parent hormone only.
Length and weight come from a reference listing and were not independently confirmed.
Sources
Sources 22
How this page was made
How it may work: Androgen-receptor signaling; injection esters, oral undecanoate, skin and nasal products have different exposure profiles.
Preparation in studies: Approved products include gels and prepared injections. A generic peptide reconstitution recipe does not apply.
FDA warning language has changed; blanket route-superiority/fertility claims are unsupported.
Research last checked: Oct 12, 2026 (a targeted search, not a full review).
Community doses, how long people take it, timing and storage are compiled with AI from public peptide guides, clinics and forums, cross-checked against other sources where we could, and rewritten in plain language. “Combining it with others” is an AI assessment of how the compounds work. Study notes are written from each paper’s abstract where one exists. How we source
Original source guide