Home / What is: Testosterone
What is:What is testosterone?
The short answerTestosterone is a hormone made mainly in the testes in men, and in smaller amounts in the ovaries and adrenal glands in women. It supports muscle, bone, energy, mood, and sex drive. Levels naturally drop with age, and a simple blood test shows where yours are.
Updated November 2026 · 3-minute read
In 30 seconds
What does testosterone do?
Muscle and bone
Helps build and keep muscle mass and bone density.
Energy and drive
Plays a role in energy, motivation, and stamina.
Mood and focus
Low levels are linked to low mood and brain fog.
Sex drive
Supports libido in both men and women.
Know the signs
What are the signs of low testosterone?
Low testosterone can look like a lot of other things. These are the most common signs, and a blood test is the only way to know.
Fatigue
Feeling tired, especially in the afternoon.
Low libido
Noticeably less interest in sex.
Less muscle
Losing muscle despite regular exercise.
Weight gain
More body fat, often around the belly.
Low mood
Feeling down, irritable, or emotionally flat.
Brain fog
Trouble concentrating or remembering.
Low motivation
Less drive at work, in the gym, or in life.
Erectile changes
Erectile dysfunction can be a sign in men.
Testing
How is testosterone tested?
With a simple blood draw. Testosterone is usually highest in the morning, so labs are often drawn early in the day.
1. Book a lab draw
Schedule at any of our 7 Colorado locations.
2. Quick blood sample
A nurse draws a small sample from your arm.
3. Review your results
A nurse practitioner walks you through your levels and your options.
Treatment
What is testosterone replacement therapy (TRT)?
TRT brings low testosterone back into a healthy range using bioidentical testosterone, prescribed and monitored with follow-up labs. Onus offers TRT for men and women.
Is it a fit?
Who is TRT for?
Worth a conversation if you
- Have several signs of low testosterone
- Have labs showing low levels
- Want a supervised plan with regular follow-up labs
- Are a woman with symptoms linked to low testosterone
Talk to your provider first if you
- Are planning to have children, since TRT can affect fertility
- Have a history of prostate or breast cancer
- Have a history of heart disease or blood clots
- Take other prescription medications
Myth vs. fact
Common testosterone myths
MythTestosterone is only a male hormone.
FactWomen make testosterone too, and it matters for their energy, mood, and libido.
MythLow T is just part of getting older.
FactLevels do drop with age, but a blood test can show whether yours are low enough to treat.
MythTRT is the same as steroid abuse.
FactTRT uses prescribed replacement doses, monitored with labs, to bring levels back to a healthy range.
MythMore is always better.
FactThe goal is a healthy range for you, which is why follow-up labs matter.
Pricing
How much does TRT cost?
Start with labs. Your provider recommends a form and dose based on your results.
| Option | Details | Price |
|---|---|---|
| Testosterone labs | Varies by age and gender | $150 - $170 |
| Female testosterone injections | 10 pre-filled syringes | $135 |
| Male testosterone injections | 10ml vial | $300 |
| Estradiol + testosterone injections | 10 pre-filled syringes | $200 |
| Troches | 30 troches | $130 |
| Cream | 30 grams | $130 |
Key terms
Testosterone terms, defined
- Total testosterone
- All the testosterone in your blood, the number most labs report first.
- Free testosterone
- The small share that isn't bound to proteins and is ready for your body to use.
- ng/dL
- Nanograms per deciliter, the unit testosterone is usually measured in.
- Hypogonadism
- The medical term for when the body doesn't make enough testosterone.
- Estradiol
- The main form of estrogen, which men and women both need in balance.
- TRT
- Testosterone replacement therapy, prescribed to bring low levels back into range.
Testosterone FAQ
What is testosterone?
Testosterone is a hormone made mainly in the testes in men, and in smaller amounts in the ovaries and adrenal glands in women. It supports muscle, bone, energy, mood, and sex drive.
What is a normal testosterone level?
Ranges vary by lab, age, and sex. For men, total testosterone under about 300 ng/dL is often considered low. Your provider looks at your symptoms and your results together.
What are the signs of low testosterone?
Common signs include fatigue, low libido, losing muscle, weight gain, low mood, brain fog, and low motivation. In men, erectile dysfunction can also be a sign.
Do women need testosterone?
Yes. Women make testosterone in smaller amounts, and it plays a role in energy, mood, and libido. Onus offers TRT for women as well as men.
How is testosterone tested?
With a simple blood draw. Levels are usually highest in the morning, so labs are often drawn early in the day.
How much does TRT cost at Onus?
Testosterone labs are $150 to $170. TRT options start at $130 for troches or cream, $135 for female injections, and $300 for male injections.
Where can I get my testosterone tested in Denver?
At any of the 7 Onus locations: LoHi, Wheat Ridge, Boulder, Denver Tech Center, Central Park, Highlands Ranch, and Fort Collins.
What states do you serve for telemedicine?
We provide telemedicine services for residents of Colorado.
What is the contact information for the pharmacies?
Olympia Pharmacy: olympiapharmacy.com, phone 407-735-2201, 4600 LB McLeod Road, Orlando, FL 32811, inquiries@olympiapharmacy.com.
Your best days are still ahead.
Find out where your testosterone stands with a lab draw at any of our 7 Colorado locations.
Schedule a Lab Draw