Hormones play a critical role in regulating many of your body’s essential functions. Here are some key reasons why understanding your hormone levels matters:

Detect Imbalances Early: Hormonal imbalances can lead to issues like fatigue, weight gain, mood swings, infertility, low libido, or sleep problems. Identifying imbalances early helps prevent more serious health problems.

Understand Symptoms: If you're experiencing unexplained symptoms (e.g., irregular periods, anxiety, hair loss), hormone testing can help pinpoint the cause and guide effective treatment.

Optimize Reproductive Health: For both men and women, hormone levels affect fertility, menstrual cycles, and sexual health. Tracking hormones can help with family planning or diagnosing reproductive issues.

Support Aging and Menopause/Andropause Management: As people age, hormone levels shift. Monitoring these changes can help manage age-related conditions like menopause, low testosterone, or bone loss.

Guide Treatment Plans: If you're undergoing hormone replacement therapy (HRT), thyroid treatment, or managing conditions like PCOS, regular hormone testing ensures treatment is effective and safe.

Improve Mental Health and Energy: Hormones like cortisol, estrogen, testosterone, and thyroid hormones significantly impact mood, energy, and motivation. Balancing them can improve overall well-being.

All tests are processed in CLIA- and CAP-certified labs—standards trusted across the medical community. Your blood and urine samples are collected on-site by licensed medical professionals and analyzed using state-of-the-art technology. It’s the safest, most accurate way to test, especially given the complexity and depth of what Function measures.

In traditional healthcare, comprehensive testing usually only happens after symptoms appear or a condition is suspected. But waiting until something goes wrong before checking your health doesn’t make much sense.

Yes, hormone levels naturally fluctuate throughout your life—and even throughout the day. These changes are influenced by age, biological sex, lifestyle, stress, diet, sleep, and medical conditions.

Yes, Stark uses medical-grade lab tests that meet the highest clinical standards, delivering accurate and reliable results you can trust for informed decision-making. 

Most lab visits take about 15 minutes, as long as you arrive on time. For your initial round of annual testing, you may need to complete two separate visits to cover the full panel.

The test usually only requires about 30 mL of blood—just a small amount.

Fasting for 8 hours before most tests is required to ensure accurate results. We also highly recommend to stay well-hydrated

We believe that you should be doing it quarterly for optimization, but a minimum of once a year.

For females, timing is important and it is important to schedule on day 3-5 or 19-22 of your cycle.