Zai Zao San
Do not self-treat with Zai Zao San
Practitioner-prepared only. The amount of aconite must be set by a trained practitioner who knows the product and your health.
If this is an emergency
Some reactions to Zai Zao San need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Who should avoid Zai Zao San?
- Do not use if you are pregnant or trying to get pregnant. This is an absolute ban, not a caution.
- Do not use if you are breastfeeding.
- Do not use if you are buying it yourself. This formula should only ever be given by a qualified Chinese medicine practitioner working with a tested product.
- Do not use if you are giving it to a child.
- Do not use if you have any heart problem, including an uneven heartbeat (arrhythmia), heart failure or past heart attack.
- Do not use if you take digoxin or any drug for heart rhythm.
- Do not use if you have high blood pressure.
- Do not use if you have low potassium (hypokalaemia, a low level of a salt your heart needs).
- Do not use if you have kidney disease, or have ever had kidney damage from herbs.
- Do not use if you have liver disease.
- Do not use if you take warfarin or any other blood thinner.
- Do not use if you take steroid tablets such as prednisone, or water pills (diuretics).
- Do not use if you have a fever with sweating, a sore throat or a hot, dry feeling. The old texts treat this as the wrong pattern for the formula.
- Do not use if you are already taking another Chinese product that holds aconite.
- Do not use if you have surgery planned in the next two weeks.
- Do not use if you are drinking alcohol.
When should you see a doctor?
Call emergency services at once if your lips, tongue, face or fingers feel numb or tingly, if your heart races or skips, if you feel faint, weak or sick after taking it, or if you have chest pain or trouble breathing. These can be signs of aconite poisoning, which can be deadly. Take the packet with you.
See a doctor the same day if you have a fever above 38.5C, a bad headache with a stiff neck, or if you cough up blood.
See a doctor soon if your cold is no better after two days, if your ankles swell, if your blood pressure rises, or if you pass much less urine than usual.
- What it is: Zai Zao San (Renewal Powder) is a warming Chinese herb formula, holding prepared aconite, once given for chills and flu-like illness in a weak person.
- Active ingredients: Prepared aconite (fu zi), Asarum (xi xin), Astragalus (huang qi), Ginseng (ren shen), Cinnamon twig (gui zhi), Notopterygium (qiang huo), Siler (fang feng), Ligusticum (chuan xiong), White peony (bai shao), Licorice (gan cao), Roasted ginger, Jujube (red date)
- Side effects: Stomach upset and sweating are common; aconite can cause tingling, heart rhythm harm and death.
- Pregnancy & breastfeeding: Avoid in pregnancy and while breastfeeding.
Educational information, not medical advice — ask your doctor or midwife.
What is Zai Zao San?
Zai Zao San is a herb blend from Chinese medicine. Its English name is Renewal Powder. This library lists it as a single drug (a TCM formula), not as loose herbs you mix at home.
Old healers gave it for a chill or flu in a weak, older or run-down person. The classic picture is chills, no sweat, a heavy head, aching limbs and low energy. It was used for a few days only.
Human proof is very thin. We could not find a trial of this blend in people. Long use in a tradition is not proof that a remedy works.
The blend also holds two risky herbs: prepared aconite and asarum. Both can cause real harm. This is not a self-care item, and it is not safe to buy and try on your own.
How does Zai Zao San work?
No one has shown how this blend acts in the body. The lab and animal work we have is on single herbs, not on the blend, and it cannot tell us what happens in a sick person.
In Chinese medicine terms, the blend is said to warm yang (the body's inner warmth) and lift qi (its working energy). Warming herbs sit beside herbs meant to push out wind-cold, the old name for a chill.
The aim of the old design was to help a weak person throw off a cold without draining them further. That is the traditional model, written in the language of Chinese medicine.
What forms does Zai Zao San come in?
Most often the raw herbs are cooked into a strong tea (a decoction) and drunk warm. The aconite is boiled first and for longer than the rest.
You may also see granules that dissolve in hot water, loose powder, or pills. Strength varies a lot between makers.
If a product is used at all, it should come from a licensed maker who tests and controls the aconite. A practitioner should choose it for you.
Where it comes from:
Zai Zao San comes from Shang Han Liu Shu (Six Texts on Cold Damage), written by Tao Hua in Ming dynasty China, around 1445.
It has stayed a named, taught formula in Chinese medicine ever since. Its English name, Renewal Powder, points to the idea of renewing a worn-out person's strength.
What does Zai Zao San help with?
- Colds and flu-like chills in a weak or older person: This is the classic use, and it is the one the old texts describe in most detail. The person is cold, pale and worn out, and cannot seem to sweat the chill off. We found no human trial testing the blend for this.
- Chills with no sweating: Old texts treat 'no sweat with strong chills' as the key sign for this formula. The warming herbs were meant to open the surface gently. There is no trial evidence in people to check that idea.
- Body aches during a cold: Qiang huo and fang feng were added for aching limbs and a heavy head. This use rests on tradition alone. No trial has tested the blend for pain of any kind.
- Tiredness that comes with a cold: Ginseng and astragalus were included to support a person with little reserve. Some lab work looks at these herbs on their own, but that is not proof for the blend. Ongoing tiredness needs a doctor, not a herb blend.
What are the side effects of Zai Zao San?
- Numb or tingling lips, tongue, face or fingers: a warning sign of aconite poisoning; get emergency help
- A racing, slow or uneven heartbeat: get emergency help
- Nausea and vomiting
- Belly pain or loose stools
- Dizziness or feeling faint
- Sweating and flushing
- Headache or trouble sleeping
- Higher blood pressure, puffy ankles and low potassium (a salt your heart needs), from the licorice
- Rash or itch
Good to know:
Most mild effects are stomach upset, sweating or poor sleep. Those settle when you stop.
The serious risk is the aconite. Tingling of the mouth or face, a strange heartbeat, weakness or vomiting can be early poisoning. This has caused deaths.
Treat any of those signs as an emergency. Stop the herbs and call emergency services.
Options to discuss with a clinician
If you're reaching for this because a cold has left you aching, chilled or wiped out, it's worth knowing that better-studied routes exist for each of those complaints — and each one is a conversation with a doctor, pharmacist or qualified herbalist, not something to pick off a shelf in place of this formula.
**Body aches and feverish chills with a cold.** A pharmacist can talk you through the ordinary over-the-counter options for aches and fever, and check them against anything else you take. Worth asking about rather than guessing.
**Chills with no sweating, or a cold that won't shift.** Ask a clinician (any qualified health professional) to confirm it really is a simple viral cold. Chills with rigors (violent shivering), breathlessness or a fever that climbs need assessing, not self-treating.
**Tiredness during and after a cold.** Post-viral fatigue is common, but persistent exhaustion has many causes — anaemia, thyroid problems, poor sleep. A GP can test for these.
**Colds in an older or frail person.** This group is exactly where complications and drug interactions bite hardest. A doctor or pharmacist should be involved early, and told about every supplement and herbal product already being taken.
If you want a traditional-medicine approach, ask a registered practitioner directly about the risks in what you're considering.
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