What is Ci Shi?

Ci Shi is a mineral used in Chinese herbal medicine. Its common name is magnetite, a heavy, dark iron ore. Healers crush it to a powder and add it to herb mixes.

In tradition it is given to settle a restless mind and to help sleep. It is also used for a pounding heartbeat, ringing in the ears, poor hearing and blurred vision.

The verdict is simple. Ci Shi is a long-standing staple of Chinese medicine, but good human trials are lacking. Long use in a tradition is not proof that a remedy works, and we say that once here.

Ci Shi is a single drug (one TCM herb), not a blend. It is almost always cooked with other herbs in a formula.

How does Ci Shi work?

No one has shown how Ci Shi works in the body. Any account of it is theory, not proven fact.

Magnetite does not dissolve well in water or in the gut. So most of what you swallow likely passes straight through you. Small amounts of iron may be taken up, and any metal traces in the rock may be as well.

Chinese medicine uses a different idea. The mineral is heavy, so it is said to weigh down rising yang (an upward, stirred-up pattern) and to calm the mind. That is a traditional model, not a lab result.

What forms does Ci Shi come in?

Ci Shi is sold as a grey-black powder or as small crushed chips.

Two types are common. Raw Ci Shi is simply ground up. Calcined Ci Shi is heated red-hot and dropped into vinegar, which makes it crumble more easily.

Most often it is boiled in a decoction (a strong herb tea) with other herbs. It is also pressed into pills or stirred into powders.

Where it comes from:

Ci Shi is named in the Shennong Ben Cao Jing, a Chinese herb text written about 2,000 years ago. It has stayed in use since then.

It is best known in the old formula Ci Zhu Wan, used for eye and ear complaints. Classic texts group it with the mineral drugs that 'anchor' and calm.

What does Ci Shi help with?

• Trouble sleeping: This is the main traditional use. Ci Shi is added to sleep formulas for people who feel wired and cannot settle at night. We found no good human trial testing Ci Shi on its own for sleep.
• Restlessness and worry: Old texts say the mineral's weight calms an agitated mind. Modern proof is missing. If worry is taking over your days, speak to a doctor rather than self-treating.
• Palpitations (a racing or pounding heartbeat): Tradition uses Ci Shi for a heartbeat that feels loud or fast when the mind is stirred up. There is no trial evidence for this. New or frequent palpitations need a medical check first, as some causes are serious.
• Tinnitus (ringing in the ears): Ci Shi is a classic pick for ringing ears in Chinese medicine, usually in a formula. Human evidence is limited to small, poor-quality reports of multi-herb mixes, so we cannot say it helps.
• Poor hearing: Traditional texts pair Ci Shi with kidney-tonic herbs for hearing that fades with age. No modern study supports this. Sudden hearing loss is an emergency and needs same-day care.
• Blurred vision and sore, dry eyes: The formula Ci Zhu Wan was used for dim, blurred sight. This is traditional standing only. Vision changes should be checked by an eye doctor.
• Dizziness: Used in tradition when dizziness comes with headache and a flushed, tense feeling. No trial evidence supports it.
• Wheezing and shortness of breath: Some old formulas add Ci Shi for breathlessness, based on the idea that it helps the body draw breath downward. There is no human evidence. Never swap it for an asthma inhaler.
• Seizures (fits): Classic texts mention mineral 'anchoring' drugs for fits. This use is historical only and is not supported by trials. Seizures need proper medical treatment.

Which foods are rich in Ci Shi?

Tea, coffee and dairy taken at the same time will cut how much iron you absorb from it.

What are the side effects of Ci Shi?

• Upset stomach or nausea
• A heavy, full feeling after dosing
• Loss of appetite
• Constipation or hard, dark stools
• Loose stools in some people
• Iron build-up in the body with long use
• Exposure to lead or arsenic if the material is untested

Good to know:

Most reported problems are stomach complaints, and they usually stop when you stop the herb. The bigger worry is not the herb itself but the rock it comes from.

Mined minerals can carry lead or arsenic. Long or heavy use can also push iron too high, which can harm the liver and heart over time. That is why this is not a herb to take casually or for long stretches.

How much Ci Shi should you take?

• Recommended daily: No safe dose has been set by modern research. What follows is simply what traditional practice uses. In a decoction, texts give 9 g to 30 g of the crushed mineral per day, shared across a formula. It is boiled first, on its own, for 20 to 30 minutes before the other herbs go in. As a powder or in pills, 1 g to 3 g a day is typical. Only use products that have been tested for lead and arsenic.
• Best time of day: Sleep formulas are usually taken in the evening, about an hour before bed. Other formulas are split between morning and evening.
• With or without food: Take it after food. The mineral is heavy and can upset an empty stomach. Keep it at least 2 to 4 hours apart from most medicines.
• Time to effect: Tradition expects some change in sleep or restlessness within a few days. There is no trial data to confirm any timeline.
• How long to take it: Traditional use is short-term, usually one to three weeks. Check in with a trained practitioner after two weeks. Do not take it for months on end. Long use may load your body with iron and with any metal traces in the rock.