600-Year-Old Formula Chinese Doctors Prescribe for Menopause

Creator: Project M
Published: 2026-08-24

Updated August 2026

It sounds unlikely on its face: a herbal formula, more than 600 years old, that doctors in China still prescribe for perimenopause and menopause, through the modern health system, side by side with hormones and antidepressants.

The formula is real, it has a name, and the prescription records are public.

The 600-year-old formula doctors in China prescribe for peri/menopause is Jia Wei Xiao Yao San, a 10-herb Traditional Chinese Medicine (TCM) formula first recorded around the 16th century, and it remains the single most prescribed herbal formula for menopausal symptoms in Taiwan's national health system today.

Key takeaways

This is not folklore; it is documented prescribing. Taiwan's national health insurance logs every herbal prescription, and Jia Wei Xiao Yao San tops the list for menopausal symptoms.
The same formula is prescribed by physicians in Japan under the name Kamishoyosan, where it is covered by national health insurance.
Doctors reach for it for the stress side of the transition: tension, irritability, disrupted sleep, and mood, the symptoms hormone therapy often leaves unresolved.
In a randomized trial, the formula relieved most menopausal symptoms with no significant difference from hormone therapy, with fewer side-effect dropouts.

Yes, doctors really prescribe it

Start with the part that sounds least believable, because it is the best documented.

In Taiwan, herbal medicine runs through the national health insurance system, which means every prescription is logged in a government database covering a population of 23 million. When researchers analyzed that database for menopausal symptoms, one formula sat at the top of the prescribing list: Jia Wei Xiao Yao San. Source: Taiwan nationwide prescription analysis (PMID 21824510). This is not a survey of what people buy in shops. It is a record of what licensed doctors actually wrote.

Japan runs the same way. There, classical Chinese formulas are called Kampo medicine, manufactured to pharmaceutical standards, prescribed by physicians, and covered by the national health insurance program. Source: Prescription of Kampo drugs in the Japanese health care insurance program (PMC3914391). The formula in question is one of the standard Kampo prescriptions for menopausal symptoms, under its Japanese name, Kamishoyosan.

In mainland China, TCM is formally integrated into the health system: hospitals have TCM departments, physicians train in both traditions, and classical formulas are dispensed alongside modern drugs. A woman in her late 40s describing tension, poor sleep, and irritability to her doctor in Taipei, Tokyo, or Shanghai may walk out with this formula the way an American woman walks out with a prescription slip.

The formula has a name

Jia Wei Xiao Yao San translates roughly as "augmented free and easy wanderer." It is the original 8-herb Xiao Yao San, first recorded nearly 1,000 years ago, plus two cooling botanicals added around the 16th century, when physicians noticed that many midlife women showed the classic stress pattern plus internal heat: flushing, sharper irritability, restless nights.

The formula is built as a system with an internal hierarchy. Bupleurum (Chai Hu) leads, restoring movement to a jammed stress response. White Peony (Bai Shao) softens tension and nourishes what stress drains. Gardenia (Zhi Zi) and Moutan (Mu Dan Pi), the two added herbs, vent internal heat. The remaining botanicals support digestion, absorption, and steady energy, so the rest of the formula can do its work.

That is the short version. Our complete guide to Jia Wei Xiao Yao San breaks down all 10 herbs, and our Xiao Yao San guide covers the original formula it grew from.

What doctors prescribe it for

Less for hot flashes than for the stress side of the transition: the tense, can't-unwind feeling, irritability with a short fuse, waking between 1 and 3am, and mood that swings harder than the situation deserves.

In TCM terms, that cluster is called liver qi stagnation with heat: a stress response jammed under load for so long the system runs hot. Western physiology maps the same territory to stress response dysregulation colliding with shifting estrogen and progesterone. Two vocabularies, one experience.

This is also the cluster that bothers Western women most. In our 30-day consumer research study of 35 women, brain fog scored 3.27 out of 5, tension 3.21, and emotional dysregulation 3.10, while hot flashes and night sweats scored just 1.73, with only 2% at high severity. Source: Project M consumer research study results. The formula East Asian doctors reach for happens to target the symptoms Western care most often leaves on the table.

What the research shows

Three findings, stated plainly, limits included.

Against hormone therapy. A randomized trial in postmenopausal women compared Jia Wei Xiao Yao San directly against combined HRT. The formula relieved most menopausal symptoms with no significant difference from hormone therapy, and fewer women stopped taking it because of side effects like bleeding and breast tenderness. Source: randomized comparison of JWSYS and HRT (PMID 12568736). It was a small trial, so the fair read is a credible signal rather than proven equivalence.

Against placebo. In Japan's KOSMOS trial, a randomized, double-blind, placebo-controlled study of Kamishoyosan, the average change in irritability scores did not differ significantly between groups, but a significantly higher proportion of women on the formula reached meaningful improvement, and the effect was strongest in women who had not yet reached menopause. Source: the KOSMOS study (PMID 33727945). Mixed on its face, and notable underneath: the formula did best in exactly the group it is classically matched to, women still in the transition.

Against time. More than 600 years of continuous clinical use is not a randomized trial. It is, however, one of the longest observation periods any remedy has survived, inside medical systems that kept records and dropped what failed.

Why you have never heard of it

The West drew a line that East Asia never drew. Here, "medicine" and "herbs" live in separate worlds: one prescribed by doctors, the other sold next to the vitamins. In China, Taiwan, Japan, and Korea, they are one system, taught in the same universities and dispensed through the same insurance programs.

So a formula can be the standard of care for menopausal symptoms across much of Asia and remain almost unknown to American women. Nothing about the formula changed at the border. The system around it did. Our guide to Chinese herbs for menopause maps the wider landscape, and TCM for menopause explains the tradition behind it.

How women in the US take it

Three routes, with real differences between them.

A licensed practitioner. An acupuncturist or TCM herbalist can prescribe the classical formula as granules or capsules, adjusted to you. The most personalized route, and the most appointments.
Generic capsules online. The classical formula is not patented, so versions exist at every price. Quality varies widely: extraction method, herb sourcing, dosing, and testing decide what actually reaches your system, and none of that shows on the label.
A modernized formulation. A version of the formula adapted and manufactured for the US market, with verified sourcing and third-party testing.

Where The Shift fits

The Shift is Project M's daily herbal protocol for peri/menopause, and it is built on this exact lineage: a modified Jia Wei Xiao Yao San, adapted for the high-stress pattern of Western women rather than copied straight from the classical text.

The architecture is the same one described above: Bupleurum (Chai Hu) regulating the stress response, Peony (Bai Shao) softening tension, Gardenia (Zhi Zi) and Moutan venting heat, Ginger and Licorice supporting absorption. The difference is execution: full-spectrum extracts, made in the USA, third-party tested for identity and purity. The research behind the approach is on our science page.

Herbs work cumulatively, so the protocol is built on daily consistency over weeks, not single doses. It supports the body through the transition; it is not a treatment for any medical condition, and it works alongside medical care, including HRT.

Frequently asked questions

What is the 600-year-old Chinese formula for menopause?

Jia Wei Xiao Yao San, a 10-herb Traditional Chinese Medicine formula first recorded around the 16th century. It is the most prescribed herbal formula for menopausal symptoms in Taiwan's national health system and is prescribed in Japan as Kamishoyosan, covered by national insurance.

Do doctors in China actually prescribe herbs for menopause?

Yes. In China, Taiwan, Japan, and Korea, classical herbal formulas are part of the mainstream medical system, prescribed by trained physicians and, in Taiwan and Japan, tracked and reimbursed through national health insurance. The prescription databases are public research material.

Does the formula actually work?

The evidence is promising, with real limits. A randomized trial found it relieved most menopausal symptoms with no significant difference from HRT, and a placebo-controlled Japanese trial found a higher proportion of meaningful responders, strongest in women still in the transition. Trials are small, so 600 years of clinical use plus a credible trial signal is the accurate summary.

Can I take it with HRT?

In East Asia the formula is routinely prescribed alongside conventional treatment, including hormone therapy, because the two work on different layers: HRT on hormone levels, the formula on the stress response. Tell your doctor about every supplement you take so they have the full picture.

How do I get it in the US?

Through a licensed TCM practitioner, as generic capsules online, or as a modernized formulation like The Shift. If you go the generic route, look for third-party testing and disclosed sourcing, because quality varies more than labels reveal.

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