Zhu Sha
Do not self-treat with Zhu Sha
If this is an emergency
Some reactions to Zhu Sha 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 Zhu Sha?
- Do not use if you are pregnant, trying to conceive, or breastfeeding, because mercury crosses to the baby and passes into breast milk
- Do not use if you are choosing a remedy for a baby, child or teenager, as young bodies are especially vulnerable to mercury
- Do not use if you have any kidney disease, reduced kidney function, or are on dialysis
- Do not use if you have a nerve or brain condition, including tremor, numbness, seizures or memory problems
- Do not use if you already have a known mercury exposure from work, dental work or a high-fish diet
- Do not use if you take medicines that stress the kidneys, such as ibuprofen-type painkillers or certain antibiotics
- Do not use if you take other mineral or metal remedies such as realgar (Xiong Huang) or calomel (Qing Fen)
- Do not use if you take iodide-containing medicines or high-iodine supplements such as kelp
- Do not use if you are an older adult, since kidney function naturally declines with age
- Do not use if you simply want a calming remedy you can take on your own, because there is no safe self-use of this mineral
When should you see a doctor?
Get emergency medical care now, or call your local poison centre, if you or a child has swallowed a product containing Zhu Sha, cinnabar, Cinnabaris or vermilion, even once.
Go to an emergency department straight away if any of these appear:
Repeated vomiting, severe stomach pain, or diarrhoea that is bloody or watery and will not stop.
Passing little or no urine, dark or foamy urine, or new swelling of the ankles, face or eyelids.
A metallic taste, heavy drooling, sore or bleeding gums, or mouth ulcers.
Shaking hands, numbness or pins and needles in the hands or feet, unsteady walking, slurred speech, confusion, or a sudden change in mood or behaviour.
Trouble breathing, chest tightness or coughing after being near heated or ground red mineral powder.
In a baby or child: drowsiness, refusing feeds, a rash with peeling or reddened palms and soles, irritability that will not settle, or fewer wet nappies than usual.
Bring the product and its label with you, because it helps the team identify the mercury source and start treatment sooner.
- What it is: A restricted mercury mineral (mercuric sulfide) that can cause mercury poisoning and kidney damage, with no safe amount to swallow.
- Active ingredients: Mercuric sulfide (a mercury compound), Contaminating free mercury and methylmercury, Trace lead and arsenic in some ore
- Side effects: Mercury poisoning, kidney failure, nerve damage and harm to babies; a large exposure can be life-threatening.
- Pregnancy & breastfeeding: Avoid in pregnancy and while breastfeeding.
Educational information, not medical advice — ask your doctor or midwife.
What is Zhu Sha?
Zhu Sha is cinnabar, a bright red mineral made of mercuric sulfide, which is a mercury compound. It is restricted because mercury is a heavy metal poison and no safe amount to swallow has ever been established. Swallowing it can cause mercury poisoning and lasting kidney damage.
In Traditional Chinese Medicine it was used as a heavy, cooling mineral to calm the mind. It usually appeared as a small part of prepared pills and powders rather than on its own.
Traditional use is not proof that something works, and it is not proof that something is safe. Please keep that in mind for every section below.
The evidence verdict is short: no modern human trial shows that Zhu Sha helps anything, while the human record includes many reports of mercury poisoning from products that contain it.
How does Zhu Sha work?
No one has shown how Zhu Sha could calm the mind, and no modern trial supports the idea. The traditional theory was that a heavy, cold mineral could weigh down and settle an overactive spirit.
How it causes harm is much better understood. Mercury sticks to sulfur-rich parts of the proteins inside your cells and stops those proteins working.
The kidneys are hit hardest, because they filter and concentrate mercury. The nervous system is the next target, which is why tremor, numbness and mood changes are common signs of poisoning.
Cinnabar dissolves poorly in the gut, so only a fraction of the mercury is absorbed. But that fraction lingers in the body and adds up with each repeat exposure.
What forms does Zhu Sha come in?
Zhu Sha is most often met inside finished products rather than as a loose herb. Common forms include a fine red-orange mineral powder (sometimes sold as vermilion), and a red coating painted on the outside of traditional pills.
It has also been named as an ingredient in some patent Chinese medicines, including calming pills such as Zhu Sha An Shen Wan, Bai Zi Yang Xin Wan and some versions of An Gong Niu Huang Wan.
Imported sleep and anxiety powders, infant teething and fright powders, and some amulet or ritual products have also been found to contain it. If a red mineral or vermilion powder appears on a label, treat it as a reason to ask a pharmacist before anyone takes it.
Where it comes from:
Cinnabar has a long recorded history in Chinese medicine, where it was classed as a spirit-calming mineral. Classical texts from the Han era onward listed it for fright, restlessness, palpitations and disturbed sleep.
Practitioners of the past also used it as a coating on pills and as a red pigment, and it held a place in early alchemy, where mercury minerals were linked to long life.
It was traditionally regarded as a potent, restricted substance rather than an everyday remedy. Modern regulators and many contemporary practitioners have moved away from it entirely, and mercury-free versions of the old formulas are now common.
What does Zhu Sha help with?
- Insomnia (trouble sleeping): In the past, people believed this heavy mineral could calm a restless mind and bring sleep. It was usually mixed into a calming formula. No human trials show that it helps sleep. What human records do show is mercury poisoning from calming powders and pills. So the risk is real, while the benefit is unproven.
- Palpitations (a pounding or racing heartbeat) with anxiety: Old texts paired it with other calming herbs for fear, unease and a thumping heartbeat. No modern study backs this use. Palpitations can also be a sign of a heart or thyroid problem. They need a medical check, not a mineral remedy.
- Fright and restlessness in children: Children were once given tiny amounts inside traditional powders for night terrors and agitation (being very upset and restless). This is one of the most dangerous uses from the past. Children take in mercury easily, and their kidneys and brains are still growing. Poisoning cases in babies given imported red powders are well documented.
- Convulsions (seizures) and delirium (confusion) during high fever: In the past, it appeared in emergency formulas for fever with fits and confusion. There is no trial evidence that the cinnabar part helps. Mercury-free versions of these formulas are now sold. Seizures and confusion with a fever are an emergency. They need hospital care, not a herbal product.
- Mouth and throat sores (applied to the surface in the past): Some past practice used it in powders placed on sores. Mercury passes through broken skin and through the lining of the mouth, so this route is not safe either. There is no proof that it works better than ordinary mouth care.
What are the side effects of Zhu Sha?
- Mercury poisoning, which can come on fast or build up slowly
- Kidney damage, including protein in the urine and little or no urine
- Nephrotic syndrome (a kidney problem that leaks a lot of protein and causes swelling)
- Tremor (shaking), numbness or pins and needles in the hands and feet
- Memory trouble, poor focus, feeling cranky, anxious or moody
- A metal taste, sore or bleeding gums, mouth ulcers and heavy drooling
- Feeling sick, throwing up, stomach pain, and diarrhoea that may have blood in it
- Skin rashes, and peeling or red palms and soles
- Lung injury and trouble breathing if mercury vapour (fumes) is breathed in
- Harm to an unborn baby, and mercury passing into breast milk
- Harm to growth and learning in babies and young children
Good to know:
These are serious harms, not mild side effects. One large exposure can cause throwing up, bloody diarrhoea and kidney failure within hours to days.
Small amounts taken again and again are just as worrying. They can harm the nerves and kidneys slowly, over weeks or months. Some of that damage may never fully heal, even after mercury is removed from the body.
Is Zhu Sha legal where you live?
In the United States, mercury compounds such as cinnabar are not lawful ingredients in dietary supplements, and the FDA has repeatedly warned about imported remedies found to contain mercury. In China it still appears in the official pharmacopoeia inside certain prepared medicines under strict limits, while the UK, the EU, Canada, Australia and Hong Kong all restrict or bar mercury-containing herbal products from general sale.
Options to discuss with a clinician
If you were looking at Zhu Sha for sleep, anxiety or palpitations, safer routes exist, and each one is worth raising with a doctor or a qualified practitioner first.
For sleep, ask about CBT-I (a talk therapy for insomnia), which has the strongest evidence, plus practical steps on light, caffeine and bedtime routine. Gentler herbs such as valerian, passionflower, chamomile or jujube seed (Suan Zao Ren) are sometimes discussed, and a clinician can check them against your medicines.
Within Traditional Chinese Medicine, mercury-free versions of the old calming formulas are now widely made. A registered practitioner can choose one and confirm the label carries no cinnabar, Cinnabaris or vermilion.
For palpitations, confusion or seizures, skip herbs and get assessed. These can point to heart, thyroid or brain problems that have proper treatments.
If you or a child has already taken a product containing Zhu Sha, ask a doctor about a blood or urine mercury test and a kidney check. Testing and any treatment are medical decisions, not something to attempt yourself.
Graded pages for the options named above:
- Passionflower — evidence grade B, traditional tier T2
- Chamomile — evidence grade B, traditional tier T3
- Caffeine — evidence grade A, traditional tier T0
Review status
This page has not been signed off by a pharmacist and is not published. It is shown here for a policy decision only.