Testosterone is one of the most critical hormones for men’s health, influencing sexual function, bone density, muscle mass, and mental well-being. When levels deviate from the normal range—either too high or too low—it can lead to significant health issues.
Low testosterone (often called “low T”) can drain your energy and lower your libido, while high testosterone may result in aggression, severe acne, and reduced sperm count.
But what exactly constitutes a normal level? What causes these fluctuations, and how can you check your own levels? This guide covers everything you need to know.
What should testosterone levels be in men?
Testosterone is the primary androgen (sex hormone) in the male body, responsible for developing characteristic male traits.
For adult men, the standard reference range for total testosterone is typically 300 to 1,000 nanograms per deciliter (ng/dL). The American Urological Association (AUA) defines low testosterone as a level below 300 ng/dL. However, a diagnosis is rarely made on a single number. To confirm low T, doctors usually require:
- Two separate blood tests taken on different mornings.
- The presence of clinical symptoms like low libido, chronic fatigue, or reduced muscle mass.
It is completely normal for testosterone levels to fluctuate. Factors such as aging, lifestyle choices, underlying health conditions, and certain medications can cause production to rise or fall.
Levels can even change hour by hour. Testosterone is typically highest in the early morning (which is why blood tests are recommended before 10 a.m.) and lowest at night.
Symptoms of low and high testosterone in men
Symptoms of low testosterone
Low testosterone, also known as testosterone deficiency or male hypogonadism, is a common concern. Symptoms vary in severity and can include:
- Low sex drive
- Difficulty sleeping
- Reduced strength and muscle mass
- Low bone density
- Increased body fat or obesity
- Depression and mood swings
- Difficulty concentrating
- Low sperm count or infertility
- Erectile dysfunction (ED)
Note: While low T is linked to ED, the relationship is complex and often involves other factors.
Symptoms of high testosterone
High testosterone, or male hypergonadism, is less common but can cause distinct issues:
- Increased libido
- Excessive body hair growth
- Severe acne
- Aggressive or impulsive behavior
- Infertility
- Reduced sperm production
Abnormally high levels are often the result of anabolic steroid use or tumors in the testes, adrenal glands, or pituitary gland.
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Causes of high or low testosterone levels
Many factors influence testosterone production. Some are controllable (like diet and exercise), while others are not (like genetics or aging).
Causes of low testosterone
- Undescended testicles
- Orchitis (testicle inflammation, often from mumps)
- Cancer treatments (chemotherapy/radiation)
- Natural aging
- Pituitary gland disorders
- HIV/AIDS
- Obesity
- Surgery or trauma to the testicles
- Chronic stress
- Genetic conditions like Klinefelter syndrome or Kallmann syndrome
Causes of high testosterone
- Tumors in the testicles, adrenal glands, or pituitary
- Use of anabolic steroids
- Excessive use of testosterone supplements
Does testosterone drop with age?
Yes, testosterone levels naturally decline as men age. The risk of developing low T typically increases starting around age 35. Research suggests that free testosterone (the form available for the body to use) may drop faster than total testosterone levels.
Healthy testosterone levels by age
While ranges vary by laboratory, older men generally have lower levels than younger men. Below are typical reference ranges:
| Age Group | Total Testosterone (ng/dL) |
|---|---|
| Infancy and childhood | <7–20 |
| 10–14 years old | <7–1,200 |
| 15–18 years old | 100–1,200 |
| 19–39 years old | 264–916 |
| 40–79 years old | 264–916 |
Note: Reference ranges can vary between labs.
A 2022 study published in the Journal of Urology analyzed over 1,400 men aged 20 to 44. The researchers argued that a “one-size-fits-all” cutoff of 300 ng/dL might miss deficiencies in younger men. They proposed age-specific thresholds, suggesting levels as high as 409 ng/dL for men aged 20–24 and 350 ng/dL for men aged 40–44 should be considered the lower limit of normal.
Risk factors for high or low testosterone
Risk factors for low testosterone
- Advanced age
- Lifestyle habits promoting obesity (poor diet, lack of exercise)
- Misuse of alcohol or street drugs
- Family history of genetic conditions
- Certain medications
- Testicular injury or disease (e.g., testicular cancer)
Risk factors for high testosterone
- Use of performance-enhancing drugs (anabolic steroids)
- Taking testosterone supplements above prescribed doses
- Family history of hormone-secreting tumors
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Diagnosing low or high testosterone levels
The good news is that abnormal testosterone levels are usually treatable once the cause is identified.
A doctor can order a total testosterone blood test. noRxClinic offers convenient at-home testing kits to save you a trip to the clinic. Providers may also check:
- Free testosterone
- Sex hormone-binding globulin (SHBG)
The AUA recommends testing in the morning while fasting, ideally on two separate occasions. If levels are outside the normal range, additional tests may include:
- LH and FSH tests: To determine if the issue originates in the testicles or the brain.
- Thyroid or prolactin tests: To rule out other hormonal imbalances.
Treatment for high or low testosterone levels
Once the cause is identified, you can discuss treatment options with your provider.
Testosterone Replacement Therapy (TRT)
TRT is a common treatment for low T, available as:
- Patches
- Gels
- Injections
Under medical supervision, TRT can effectively relieve symptoms. However, it has pros and cons. Alternatives like enclomiphene and anastrozole can stimulate the body’s natural production of testosterone. Discussing these options with a healthcare provider is essential.
Treatments for high testosterone
If high levels are caused by an underlying condition, doctors may prescribe anti-androgens (such as flutamide or spironolactone) to reduce production. If a tumor is the cause, surgical removal may be necessary.
Healthy lifestyle habits for low T
If you want to support healthy testosterone levels naturally, consider these habits:
Exercise
Moderate to intense physical activity can temporarily boost testosterone. Exercise also aids weight loss, strengthens bones and muscles, and improves mood—all crucial for hormonal health.
Sleep
Testosterone production peaks at night. A 2011 study found that young men who slept only five hours a night had testosterone levels 10–15% lower than normal. The CDC recommends at least seven hours of sleep per night for adults.
Diet
No single food guarantees higher testosterone, but a healthy diet helps maintain a healthy weight, which is vital since obesity is a risk factor for low T. A 2023 study suggested that the Mediterranean diet may improve testosterone levels in men with fertility issues.
Healthy habits for high testosterone
If high levels are due to anabolic steroid use, do not stop abruptly. Consult a doctor to create a medically supervised tapering plan to avoid withdrawal symptoms and hormonal imbalances.
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Preventing low or high testosterone
While you can’t control everything, you can support healthy levels by:
- Maintaining a healthy weight through diet and exercise.
- Treating underlying medical conditions.
- Getting adequate rest.
- Managing stress with relaxation techniques.
- Avoiding recreational anabolic steroids.
- Taking prescription medications exactly as directed.
- Limiting alcohol and avoiding recreational drugs.
noRxClinic offers access to various treatment options, including enclomiphene and a 2-in-1 combination of enclomiphene and tadalafil for men dealing with both low T and ED. Contact a healthcare provider today to see if you qualify.
Sources (12)
- American Urological Association. (2024). Evaluation and Management of Testosterone Deficiency. https://www.auanet.org/guidelines-and-quality/guidelines/testosterone-deficiency-guideline
- Zhang, H., et al. (2022). Association between testosterone levels and bone mineral density in females aged 40–60 years from NHANES 2011–2016. Nature. https://www.nature.com/articles/s41598-022-21008-7
- Mohammadi-Shemirani, P., et al. (2020). Effects of lifelong testosterone exposure on health and disease using Mendelian randomization. Nature Medicine. https://www.nature.com/articles/s41591-020-0968-0
- Leproult, R., & Van Cauter, E. (2011). Effect of 1 week of sleep restriction on testosterone levels in young healthy men. JAMA Internal Medicine. https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/481976
- Fabbri, E., et al. (2016). Bioavailable testosterone linearly declines over a wide age spectrum in men and women from the Baltimore longitudinal study of aging. Journals of Gerontology. https://pmc.ncbi.nlm.nih.gov/articles/PMC4978359/
- Sizar, O., et al. (2024). Male hypogonadism. StatPearls. https://www.ncbi.nlm.nih.gov/books/NBK532933/
- Donovitz, G. S. (2022). A personal prospective on testosterone therapy in women—what we know in 2022. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC9331845/
- Davis, S. U., et al. (2015). Testosterone in women—the clinical significance. The Lancet Diabetes & Endocrinology. https://www.sciencedirect.com/science/article/abs/pii/S2213858715003843
- Määttänen, I. L., et al. (2021). Testosterone and specific symptoms of depression: Evidence from NHANES 2011–2016. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC9216439/
- Horstman, A. S., et al. (2012). The role of androgens and estrogens on healthy aging and longevity. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC3636678/
- Kumar, P. E., et al. (2010). Male hypogonadism: Symptoms and treatment. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC3255409/
- You and Your Hormones. (n.d.). Congenital adrenal hyperplasia. https://www.yourhormones.info/endocrine-conditions/congenital-adrenal-hyperplasia/
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