Research review
What does skullcap do for women? What the research does and doesn't show
Neither of skullcap's two human trials reported results by sex, so there's no research describing what skullcap does for women specifically. The closest thing is a single in-vitro screening study that found a weak estrogen-receptor-binding effect from Chinese skullcap extract, in a test tube, not in a person.
Neither of skullcap's two human trials reported results by sex, so there's no research describing what skullcap does for women as its own category. The closest thing that exists is a single laboratory screen that found Chinese skullcap extract had weak estrogen-receptor-binding activity in a test tube — not a finding in any woman, menopausal or otherwise.
What the evidence doesn't support
It doesn't support a "skullcap for women" effect distinct from — or even measured separately within — the general research on the herb, because neither existing human trial broke results out by sex. It doesn't support skullcap for menopause, PMS, or any other women's-health-specific outcome; no trial has tested any of those. And the lab finding on estrogenic activity, described below, doesn't support a hormone-balancing or menopause-symptom claim: it's a receptor-binding measurement in a dish, not a trial in a person.
What the research found
The two controlled human trials of skullcap — a 2014 crossover trial of 43 healthy adults and an earlier 2003 trial in healthy volunteers — didn't report their results separately for men and women, and the published materials don't give a sex breakdown of either sample. That's a gap in how the research was reported, not a finding that skullcap works the same or differently by sex; it simply hasn't been studied that way.
The one piece of research that specifically touches on a women's-health mechanism is a 2005 laboratory study that screened 32 traditional Chinese medicinal plants, chosen because they are traditionally used around menopause, for estrogenic activity using a yeast-based receptor assay. Scutellaria baicalensis (Chinese skullcap) was one of 11 plants out of the 32 that showed measurable activity, but its potency was weak — roughly a millionth as potent as the reference hormone, estradiol, and the 9th-strongest of the 11 active plants, behind several others tested in the same assay. That's a receptor-binding signal in a laboratory system, using a plant extract at a concentration the study doesn't translate into a human dose — not a trial in menopausal women, and not evidence that a skullcap supplement changes hormone levels in a person.
No research on American skullcap addresses estrogen or any other women's-health mechanism at all; the estrogenic screen above tested Chinese skullcap only.
Questions people ask
What does skullcap do for women?
There's no research answering this specifically — neither human trial reported results by sex, and no trial has tested a women's-health outcome. The closest evidence is a lab screen finding weak estrogenic activity from Chinese skullcap extract, described above.
Does skullcap raise or affect estrogen?
In a test tube, a 2005 study found Chinese skullcap extract weakly activated the estrogen receptor. That hasn't been tested in a person, at any dose, so it doesn't answer what a skullcap supplement does to estrogen levels in someone taking it.
Is skullcap good for menopause or PMS?
No trial has tested skullcap for menopause, perimenopause, or PMS specifically. The estrogenic lab finding above is not the same thing as a trial in menopausal women.
Is skullcap safe for women who are pregnant or breastfeeding?
Neither species of skullcap has been tested in pregnant or breastfeeding people. Ask a doctor before use in either situation — that caution holds regardless of anything else on this page.
When to talk to a doctor
Menopause symptoms that are severe or disruptive, irregular bleeding, or any hormone-related concern are worth a doctor's evaluation rather than a supplement search. Skullcap is not a treatment for menopause, PMS, or any diagnosed condition. If you're pregnant, nursing, or take a prescription medication, talk to a doctor before adding any supplement.
Related reading: what is skullcap, skullcap benefits: what the research does and doesn't show, and who should not take skullcap.
Sources
- American Skullcap (Scutellaria lateriflora): a randomised, double-blind placebo-controlled crossover study of its effects on mood in healthy volunteers A 2014 randomized trial found no significant difference between American skullcap and placebo on a standard anxiety scale, though a separate mood measure improved; the trial had carryover and baseline-imbalance limitations.
- An investigation into the efficacy of Scutellaria lateriflora in healthy volunteers A 2003 double-blind, placebo-controlled trial in healthy volunteers reported an anxiety-reducing effect for American skullcap, though the paper itself noted ongoing controversy over whether the herb works, and its abstract doesn't state the dose used.
- In vitro estrogenic activities of Chinese medicinal plants traditionally used for the management of menopausal symptoms A 2005 lab screen of 32 traditional Chinese herbs found Scutellaria baicalensis (Chinese skullcap) extract had weak estrogen-receptor-binding activity in a test-tube yeast assay — about 1/1,000,000th the potency of estradiol, and among the weaker of the 11 plants that showed any activity at all. This is a receptor-binding measurement, not a human trial.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.