What do studies say about Cortisol Frauen?

The evidence on cortisol in women is nuanced, but direct application to consumer or genetic tests is limited. Cortisol, the primary stress hormone, is influenced in women by menstrual cycle phase, pregnancy, lactation, and menopause, which alter both baseline and stress-induced secretion. Women typically show a stronger cortisol response to psychosocial stress than men. However, a single cortisol measurement from saliva or blood is of little diagnostic value due to strong circadian variation (high in the morning, low at night) and acute confounders like sleep deprivation, caffeine, or psychological strain. Genetic markers (e.g., in NR3C1 or FKBP5) are not yet robust enough to predict individual cortisol levels or stress vulnerability in a clinically actionable way. Many commercial tests overpromise relative to current scientific evidence. For women experiencing stress symptoms or cycle disturbances, a medical workup (e.g., diurnal salivary cortisol profile) is more appropriate than a direct-to-consumer test. The evidence for such home tests is best classified as 'marketing' or 'unclear'.