Progesterone

Hormones

Female Hormones

Progesterone is a calming hormone that counterbalances estrogen and supports sleep, bone, and brain health. In women, it rises in the luteal phase after ovulation, making its levels highly dependent on cycle timing. A longevity practice tracks it to assess ovulatory function and the estrogen-progesterone balance that shapes mood, sleep, and reproductive health.

What It Measures

Calming hormone; counterbalances estrogen, supports sleep, bone, and brain health

Optimal vs. Lab Range

Longevity Optimal

Phase-dependent; adequate luteal-phase levels essential

Target range for optimal health and longevity based on research.

Standard Lab

0.1–0.8 ng/mL (F follicular), 2–25 (F luteal)

Population-based reference range from standard labs.

Why It Matters

Progesterone's role as estrogen's counterweight means adequate luteal-phase levels are important for cycle health and wellbeing. Low levels can reflect luteal-phase deficiency, anovulation, or estrogen dominance, and are associated with PMS, anxiety, and insomnia. High values are typically seen in pregnancy, with ovarian cysts, or in congenital adrenal hyperplasia. Because progesterone is profoundly phase-dependent, a value is only meaningful when the timing within the cycle is known. Interpreted alongside estradiol and the estrogen-to-progesterone ratio, it clarifies whether the two hormones are working in the balance that supports sleep, mood, and long-term hormonal health.

When Low

Luteal phase deficiency, anovulation, PMS, anxiety, insomnia, estrogen dominance

When High

Pregnancy, ovarian cysts, congenital adrenal hyperplasia

How to Optimize

When restoration is appropriate, physician-directed bioidentical progesterone is individualized to a woman's cycle, symptoms, and life stage. Stress reduction supports the hormone's natural production, since chronic stress can divert precursors away from progesterone, and clinicians sometimes consider botanicals such as vitex in specific cases. Because balance with estrogen matters, therapy is monitored over time. Hormone testing and treatment must be individualized with your physician; this content is educational and not a substitute for medical advice.

Key Interventions & Linked Compounds

Strong evidence

Key Interventions

Bioidentical progesterone (clinical)

vitex

stress reduction

Linked Compounds & Supplements

Vitex (Chasteberry)

Vitamin B6

Magnesium

Curated from clinical literature. Individual results vary; consult a qualified clinician before changing a protocol.

Ordering Notes

Specimen

Serum; saliva for diurnal cortisol panels

Patient prep

No fasting required. Maintain usual diet and medications unless advised.

Recommended cadence

Cycle-dependent

Reporting unit

Confirm with the performing lab — units vary by region.

Pre-analytic notes

Standardize draw time of day, hydration, and recent exercise. Note any acute illness, supplements, or hormonal therapies on the requisition.

Recommended Follow-Up Actions

1
Confirm the result is reliable
Repeat abnormal values before acting — preferably from the same lab, same time of day, and under consistent prep. Rule out acute illness, recent intense exercise, or medication effects that can shift Progesterone.
2
Compare against optimal, not just lab range
Use the optimal window above as the target. Lab "normal" is built from the general population and often misses early dysfunction.
3
Pair with related markers
Order a complementary panel covering metabolic, inflammatory, and hormonal context to interpret this marker properly.
4
Discuss interventions with a clinician
Use the interpretation guidance above to frame the conversation. Bring trends, not just one datapoint, to your visit.
5
Re-test on a defined cadence
If a change is implemented, re-measure in 8–12 weeks for fast-moving markers, or 3–6 months for slower ones, to confirm response before escalating.