What is Tokishigyakukagoshuyushokyoto?

Tokishigyakukagoshuyushokyoto is a nine-herb formula that Japanese Kampo doctors reach for when someone's hands and feet are persistently cold, sometimes to the point of turning white or blue and aching when exposed to winter air. It is one of the roughly 148 extract formulas covered by Japanese national health insurance, sold as a granule under numbers such as Tsumura 38, and it is genuinely common in everyday practice rather than a museum piece.

The recipe is old. It appears in the Shanghan Lun, a Chinese medical text compiled around 200 CE, as the base formula Tokishigyakuto with evodia fruit and fresh ginger added for what the text describes as long-standing internal cold. Angelica and peony are the blood-nourishing core, cinnamon and asiasarum are the warming pair, evodia and ginger drive warmth into the abdomen, and licorice and jujube soften the whole thing.

In traditional terms it suits a specific person: thin, pale, chilly, with a weak pulse that the classical texts describe as "thin and about to break". That pattern-matching is how the formula is actually prescribed in Japan, and it is also why results in unselected populations tend to be modest. It is supportive care for cold extremities, not a treatment for the underlying disease that may be causing them.

How does Tokishigyakukagoshuyushokyoto work?

The traditional explanation is that the formula "warms the channels and frees the blood vessels" — it is aimed at cold that has settled in the extremities. In modern terms, several constituents plausibly affect peripheral blood flow: cinnamaldehyde from cinnamon and gingerols from ginger are vasoactive and warming, evodiamine and rutaecarpine from evodia have been shown in laboratory work to stimulate calcitonin gene-related peptide release, a potent vasodilator, and peony and angelica have mild effects on platelet aggregation and microcirculation in preclinical models. Small Japanese studies have reported improvements in skin temperature recovery after cold challenge. These are mechanisms observed in the laboratory and in small human measurements, not proof of clinical benefit.

What forms does Tokishigyakukagoshuyushokyoto come in?

In Japan the formula is almost always a freeze-dried granule extract, standardised by the manufacturer and dispensed in 2.5 g sachets. This is the form used in essentially all published studies and the form you should look for. Traditional decoction from cut herbs is stronger and more customisable but requires a practitioner and 30–40 minutes of simmering. Capsules and tablets of the extract exist and are equivalent if the extract quantity is stated. Loose-herb products sold online without a manufacturer's extract ratio are hard to dose and hard to trust — the mokutsu and saishin components in particular need to come from a reliable supply chain (see the safety section).

Where it comes from:

The parent formula, Tokishigyakuto (Danggui Sini Tang), is attributed to Zhang Zhongjing's Shanghan Lun around 200 CE, prescribed for "cold hands and feet with a thin pulse verging on absent". The version with evodia and fresh ginger was described in the same text for patients who additionally had long-standing internal cold with vomiting. The formula travelled to Japan with Chinese medicine and was absorbed into the Kampo tradition, where the Edo-period Koho school stripped away theoretical elaboration and refined its use to a recognisable physical presentation. When Japan reintegrated Kampo into its national insurance system from 1967 onwards, this formula was among those included, and it has been continuously prescribed since — most often in winter, most often for cold-related complaints.

What does Tokishigyakukagoshuyushokyoto help with?

• Cold hands and feet (hiesho): This is the formula's central use in Japan, where persistent cold extremities is recognised as a complaint in its own right. Small Japanese studies, mostly open-label, have measured faster skin-temperature recovery after cold-water immersion in people taking the extract, and patients commonly report subjective warming within one to three weeks. The studies are small, largely uncontrolled, and conducted in populations selected by traditional pattern — thin, pale, chilly individuals. That selection may be doing real work, which is a fair reason to expect less in an unselected user.
• Raynaud's phenomenon: Kampo practitioners use this formula for the cold-triggered white-blue-red colour change and pain in fingers and toes, and it is the reason most people find this page. Published human evidence is limited to small case series and open-label reports, including some in people with systemic sclerosis, suggesting reduced attack frequency and improved digital temperature. There are no large randomised trials. Raynaud's can be primary and benign or secondary to autoimmune disease, so new or one-sided symptoms, ulcers, or tissue damage need a medical assessment before you self-treat, not after.
• Chilblains and cold-induced skin lesions: Chilblains — itchy, purplish swellings on toes and fingers after cold exposure — are a traditional indication that fits the formula's warming logic, and Japanese dermatology case reports describe improvement over several weeks of use, sometimes alongside topical care. The evidence is anecdotal and uncontrolled. Practically, keeping extremities warm and dry does more of the work than any herb, and broken or ulcerated skin should be seen by a clinician because it can become infected.
• Cold-triggered headache: The classical text pairs this formula with headache and vomiting driven by internal cold, and evodia-containing formulas have a long reputation in both Kampo and Chinese medicine for a specific kind of dull, cold-associated head pain with nausea. Human trial evidence is essentially absent for this indication — what exists is clinical tradition and case description. It should not be used as a substitute for proper assessment of new, severe, or changing headaches.
• Menstrual and lower abdominal pain worsened by cold: Traditional use covers period pain and lower abdominal cramping in women who feel cold and whose pain eases with warmth. This overlaps with the better-studied peony-and-cinnamon Kampo formulas, and reasoning across formulas is not evidence. Direct clinical trial data for this specific prescription in dysmenorrhoea is very thin. Because the formula contains licorice, and because pelvic pain has many causes worth diagnosing, this is a use to pursue with a practitioner rather than alone.
• Chemotherapy-induced peripheral neuropathy (cold-triggered type): Oxaliplatin causes a distinctive cold-triggered tingling and pain in the hands, feet and throat, and Japanese oncology has explored several Kampo formulas for it, this one among them. A small number of randomised and observational studies exist; results have been inconsistent and the better-designed trials of Kampo formulas for this problem have generally not shown clear benefit. Anyone on chemotherapy should raise this with their oncology team before taking it, both because of interaction concerns and because neuropathy severity affects dosing decisions.

What can Tokishigyakukagoshuyushokyoto help prevent?

• Cold-triggered attacks in people prone to them, in traditional use — the formula is often started before winter rather than after symptoms peak, though this preventive use has not been tested in controlled trials
• Recurrence of chilblains over a cold season, as described in Japanese clinical practice; not established by trial evidence

What are the side effects of Tokishigyakukagoshuyushokyoto?

• Nausea, epigastric discomfort or loss of appetite: the commonest problem, largely from goshuyu (evodia), which is intensely bitter
• Loose stools or, less often, constipation
• Pseudoaldosteronism from the licorice: low blood potassium, rising blood pressure, ankle or facial swelling, headache, muscle weakness or cramps — more likely with long use, higher doses, older age, or alongside diuretics
• Muscle pain and weakness (myopathy) as a consequence of licorice-induced low potassium — stop and seek medical advice
• Skin rash or itching (hypersensitivity)
• Rare reports of liver enzyme elevation with Kampo formulas generally; evodia has been associated with liver injury in animal studies at high doses
• Rare interstitial pneumonia has been reported with Kampo extract formulas — new dry cough, breathlessness or fever warrants stopping and prompt medical review

Good to know:

Short courses in appropriately selected people are generally well tolerated, and the formula has a long safety record in supervised Japanese practice. The two issues that genuinely matter are the licorice, which causes a well-documented and sometimes serious electrolyte problem with prolonged use, and the sourcing of saishin and mokutsu, which must be the correct botanical species and plant part to avoid aristolochic acid exposure. Buy from a manufacturer that follows Japanese Pharmacopoeia standards.

How much Tokishigyakukagoshuyushokyoto should you take?

• Recommended daily: The standard Japanese extract-granule dose is 7.5 g of the granule preparation per day, divided into two or three doses. Traditional decoction from crude herbs uses the daily herb weights listed above, simmered and split across the day. In Japan this is a prescription item; outside Japan, follow the manufacturer's stated extract quantity and ideally work with a Kampo or Chinese medicine practitioner rather than guessing.
• Best time of day: Divided across the day — typically morning, midday and evening. Some practitioners weight the dose toward the morning and early afternoon in winter, when cold exposure is greatest.
• With or without food: Traditionally taken between meals or before food with warm water. In practice, the evodia in this formula makes it hard on an empty stomach for many people; if you get nausea or epigastric burning, taking it just after food is a reasonable trade-off.
• Time to effect: Warming of the extremities, if it happens, is usually noticed within 1–2 weeks. A 4–8 week trial is the normal window before deciding whether it is doing anything.
• How long to take it: Often used seasonally, through the cold months, then stopped. If you use it continuously for more than about 8–12 weeks, blood pressure and serum potassium should be checked because of the licorice content. There is no established safe duration for indefinite daily use.