Every claim.
Every source.

Estradiol varies roughly 8-fold across a single menstrual cycle.

Female testosterone drops approximately 50% by age 40.

Women spend an average of 2–10 years in perimenopause before formal diagnosis.

1 in 8 women will develop a thyroid disorder in her lifetime; women face 5–8× higher risk than men.

Up to 60% of people with thyroid disease are unaware of their condition.

A preconception TSH target below 2.5 mIU/L is recommended for women of reproductive age.

TSH alone is an unreliable single marker for diagnosing thyroid dysfunction; full panel testing is required.

1 in 8 U.S. couples experience infertility; female-factor causes account for approximately one-third of cases.

8–10% of reproductive-age women have PCOS; most are undiagnosed.

AMH is the preferred marker of ovarian reserve due to cycle-independence and predictive accuracy.

Insulin resistance typically precedes a diagnostic A1c elevation by 5–10 years.

Approximately 38% of U.S. adults have prediabetes; roughly 80% are unaware.

Visceral fat increases ~30% during perimenopause independent of total body weight changes.

Heart disease is the #1 cause of death in U.S. women.

Approximately 1 in 5 people carry elevated Lipoprotein(a) - a genetic risk marker not measured on standard lipid panels.

ApoB is a better single-number predictor of cardiovascular events than LDL-C.

Persistent hs-CRP elevation (>2 mg/L) is a stronger cardiovascular predictor in women than LDL-C alone.

Approximately 35% of U.S. adults have insufficient vitamin D (below 20 ng/mL).

20–30% of menstruating women are iron-deficient.

Ferritin below 50 ng/mL is associated with fatigue and hair loss in non-anaemic women.

~50% of U.S. adults fail to meet the recommended daily intake for magnesium.

Women face approximately 4× higher autoimmune disease risk than men; ~24 million Americans are affected.

Over 40% of perimenopausal women show elevated hs-CRP.

Women are approximately 2× more likely than men to be diagnosed with irritable bowel syndrome.

Approximately 70% of the immune system resides in the gastrointestinal tract.

Zonulin is a validated biomarker of intestinal barrier permeability ("leaky gut").

60–80% of primary-care visits are estimated to be stress-related.

Melatonin production declines approximately 20% per decade from age 30 onward.

Women experience insomnia at 2–3× the rate of men.

Perimenopause accelerates epigenetic aging by approximately 2 years.

Epigenetic age is modifiable: diet and lifestyle interventions can reverse measured biological age.

GrimAge and PhenoAge methylation clocks are the strongest predictors of healthspan and all-cause mortality.

Phase-specific reference intervals for estradiol, LH, FSH, and progesterone exist and should be applied to cycling women.

Iron supplementation reduces fatigue in non-anemic women with ferritin below 50 ng/mL.

The Endocrine Society recommends targeting 25(OH)D ≥75 nmol/L for optimal bone and muscle health.

Iron supplementation reduces fatigue in non-anaemic women with low ferritin.

Women remain underrepresented in randomized controlled trials across most therapeutic areas.

Diseases that disproportionately affect women receive less NIH funding than their disease burden would predict.

Sex differences in pharmacokinetics and pharmacodynamics mean reference ranges built on male trial data don't translate cleanly to women.