Testosterone, optimized for how you want to feel.
Lab-driven testosterone therapy built by a licensed clinician for your biology, not an off-the-shelf protocol. Reviewed online, monitored over time.
Start my TRT assessment
Three ways KAYU helps men, built around your goal.
Restore testosterone, raise it while protecting fertility, or simply perform when it counts. Your provider builds the right protocol from your bloodwork, and you can combine them when it makes sense.
Testosterone Replacement
Men with clinically low testosterone
Bring testosterone back into the clinically normal range. The most direct path to steadier energy, libido, mood, and sleep.
Fertility-sparing oral option
Men who want higher T without losing fertility
An oral medicine that signals your body to raise its own testosterone, so natural production and fertility stay intact. No injections.
ED Treatment
Men who want dependable erections
FDA-approved ED medicines, prescribed when appropriate for erectile function. Works on its own or alongside hormone therapy.
Not sure which fits? The assessment takes about two minutes, and a licensed clinician decides what is appropriate from your labs.
What low testosterone actually feels like.
Testosterone tends to decline gradually as men age, and low levels can quietly affect energy, mood, sleep, and sex drive. Symptoms alone don't confirm it, which is why a diagnosis is built on bloodwork and a clinician's review, never a guess.
Low energy
Persistent fatigue that sleep doesn't fix, and a harder time getting through the day.
Reduced libido
A noticeable drop in sex drive, or changes in erectile function.
Brain fog
Trouble concentrating, slower recall, and a duller sense of motivation.
Physical decline
Reduced stamina and slower recovery that does not track with your training or sleep.
Mood changes
Lower mood, irritability, or a flatter emotional baseline than feels like you.
Poor sleep and recovery
Lighter sleep, slower recovery from workouts, and stubborn body fat.
A licensed clinician confirms low testosterone with lab testing before recommending treatment. If your symptoms point somewhere else, they'll tell you, and help you find the right path.
Four steps from curious to optimized.
Take the assessment
2 minutes. Goals, symptoms, medical history.
Clinical-grade intake reviewed by a provider, not a template.
Comprehensive labs
50+ markers. At-home kit or Quest / Labcorp.
Hormones, thyroid, metabolic, inflammation, micronutrients. HSA/FSA eligible.
Consult with your provider
HIPAA video call. AI-transcribed. Recapped.
Licensed clinician reviews your labs, builds your protocol, answers questions.
Delivered in 48 hours
Discreet packaging. Refills ship automatically.
Licensed pharmacy partner. Free 2-day shipping. Cancel anytime.
Your hormones, balanced and monitored.
Restore an optimal range
When bloodwork confirms low testosterone, therapy brings levels back into a healthy range your provider targets to how you want to feel. Depending on your case, that may be injectable testosterone, a topical, or a medication that prompts your own production.
Keep the rest in balance
Testosterone doesn't work alone. Your provider manages estrogen conversion with estrogen-balance support when your labs show it's needed, so one number doesn't move at the expense of another.
Fertility-aware by design
Standard testosterone therapy can lower sperm production. If fertility matters to you, tell your provider. A licensed clinician can build a fertility-sparing oral plan that supports your own production instead.
Raise your testosterone without replacing it.
TRT adds testosterone from the outside. A fertility-sparing oral option works from the inside, switching your body's own production back on. Here is the path it takes.
The signal starts in your brain.
A fertility-sparing oral medicine signals your brain to ask for more testosterone.
It tells the pituitary to act.
Your pituitary releases more LH and FSH, the messenger hormones that signal your testes to switch production on.
You make your own testosterone.
Your testes raise their natural testosterone output and keep sperm production running, so fertility stays intact.
The result is higher testosterone your body produced itself, with no injected hormone and your fertility protected.
TRT
Replaces your testosterone
- Adds testosterone from outside the body
- Your own production can switch off
- Fertility can decline during use
- Injection or topical cream
Fertility-sparing oral option
Raises your own testosterone
- Signals your body to make more itself
- Your natural hormone system keeps running
- Designed to preserve fertility
- A simple once-daily oral
A clinician may use an oral medicine that signals your body to raise its own testosterone. Whether it is appropriate, and at what dose, is a clinical decision your provider makes from your bloodwork and goals. Individual results vary.
Medications a provider may consider for you.
Injectable testosterone
Restores levels to an optimal range when a clinician determines it's appropriate.
Estrogen-balance support
A clinician-directed option when labs show estrogen conversion needs attention.
Testosterone gel
A daily topical for men who prefer it over injections.
Fertility-sparing oral option
Signals the body's own hormone production as an alternative path for select cases.
Which medications are appropriate, and at what dose, is a clinical decision your provider makes from your bloodwork and symptoms. Individual results vary.
Why men choose KAYU for testosterone therapy.
A real clinician, on video
You speak face to face with a licensed clinician before anything is prescribed. Not a chatbot, not a one-way questionnaire.
Lab-driven protocols
We confirm low testosterone with comprehensive bloodwork and titrate your protocol to your biology, then recheck your levels over time.
Fertility-friendly options
If preserving fertility matters, your provider can build around a fertility-sparing oral option rather than defaulting to standard testosterone.
Monitored over time
Your provider tracks follow-up labs and how you feel, adjusting your protocol as you go. Message your care team any time.
Transparent pricing
You pay for care. If a treatment is prescribed, the pharmacy bills medication separately at cost, with no KAYU markup.
We say no when it's right
A clinician declines or adjusts treatment when testosterone therapy isn't the right answer, and tells you what would be instead.
A realistic timeline.
Many men first notice changes in energy, mood, and libido. Your provider checks in and answers questions as you settle into the protocol.
Follow-up bloodwork confirms your levels are in range. Your provider fine-tunes your dose based on your labs and how you feel.
Symptoms continue to settle with consistent, monitored treatment, and your provider re-checks labs to confirm levels stay in range.
Timelines are general and not a promise of results. Individual results vary, and your provider monitors your progress and adjusts your protocol along the way.
Real clinicians, not a call center.
Your protocol is built and monitored by a licensed clinician, the same people who designed KAYU's care model. Named, credentialed, and accountable for your results.
Narine Chilyan
Clinical Director · Functional & Preventive Medicine
Dr. Aram Mkhitarian
Medical Director · Integrative Medicine
How KAYU compares.
A general comparison of care models. Specific offerings vary by provider.
Pay for care, not markups.
You pay for your provider and care. If medication is prescribed, the pharmacy bills it separately at cost, with no KAYU markup. No insurance required.
Consult
Pay for your visit, no membership.
- Licensed clinician video consultation
- Personalized TRT plan if appropriate
- Licensed pharmacy when medication is part of care
- Medication billed separately at cost
Root
Ongoing care and monitoring, 10% off care.
- Everything in Consult
- Ongoing provider oversight and titration
- Follow-up lab review built in
- Unlimited secure messaging with your care team
Branch
Full hormone optimization with bloodwork included.
- Everything in Root
- Comprehensive hormone panel included
- Broader hormone optimization when appropriate
- Priority scheduling with your provider
Testosterone therapy FAQ.
What is TRT and how does it work?
Testosterone replacement therapy restores testosterone to a healthy, optimal range when your body isn't producing enough on its own. Depending on your case and goals, a licensed clinician may use injectable testosterone, a topical, or a fertility-sparing oral medicine that prompts your own production, along with support to keep the rest of your hormones in balance.
What are the symptoms of low testosterone?
Common symptoms include persistent low energy, reduced libido, brain fog, low mood, poor sleep, and slower recovery. These symptoms overlap with other conditions, which is why bloodwork and a licensed clinician's review matter before anything is prescribed.
Do I need bloodwork, and how do I know which protocol is right for me?
Yes. Testosterone replacement is a clinical decision built on data, not symptoms alone. A licensed clinician reviews your labs, including testosterone, estradiol, and related markers, to confirm low testosterone and choose a protocol that fits you, then monitors your levels over time. Which medications are appropriate is the clinician's call, not yours to pick from a menu.
Is TRT safe? What are the side effects?
A licensed clinician reviews your health history and bloodwork before anything is prescribed, and declines or adjusts treatment if it isn't appropriate for you. Like any therapy, TRT has potential side effects your provider reviews with you, and ongoing lab monitoring is part of staying safe. You can message your care team any time with questions. Individual results and risks vary.
Will TRT affect my fertility?
Standard testosterone therapy can lower sperm production. If preserving fertility matters to you, tell your provider. A licensed clinician can build a protocol around a fertility-sparing oral option that supports your own production, or recommend an alternative path.
Can I do this entirely online without a clinic visit?
Yes. Your assessment, video consult, and follow-ups happen online, and medication ships to your door. Bloodwork is done through an at-home kit or a nearby Quest or Labcorp location. Everything is reviewed by a licensed clinician.
How quickly will I notice a difference?
Many men notice improvements in energy, mood, and libido within the first few weeks, with further symptom improvement over several months of consistent, monitored treatment. Your provider adjusts your protocol based on how you feel and what your follow-up labs show. Individual results vary.
How does billing work, and do you take insurance or HSA / FSA?
You pay for your provider review and care. If a treatment is prescribed, the pharmacy bills for your medication separately, at cost, with no KAYU markup. No insurance is required, and many patients use HSA or FSA funds toward eligible care. You're only charged for medication after a licensed clinician approves it.
Who's a candidate, and can I cancel anytime?
Men with confirmed low testosterone and related symptoms are typical candidates, but it isn't right for everyone. A licensed clinician reviews your labs, symptoms, and health history to determine whether testosterone therapy, or an alternative, is the better fit. There's no long-term commitment, and you can cancel anytime.
Read the next page.
Ready to feel rooted?
Two minutes to the assessment. One week to your first consult. A protocol built on your bloodwork from a provider who knows your name.