Kushta (Calcined Metals): Why Lead, Mercury and Arsenic Rule It Out
If a hakeem, a shop or a Facebook page offers you a kushta for stamina, sugar, joints or “mardana taqat”, the safest thing you can do is walk away. This is the one class of traditional preparation where the danger is not a maybe. Kushta means a metal or mineral burned to ash, and the metals most often used are the ones that poison people slowly.
Before you read further
- Kushta is: a metal, mineral, shell or gem heated in a sealed clay crucible until it turns to a fine ash (the Ayurvedic word is bhasma)
- The worry: preparations made from lead, mercury, arsenic and their ores; also contamination of “safe” kushtas with these
- The sales pitch: stamina, “taqat”, sugar, joints, weight, weakness after illness
- The damage: slow, cumulative, often silent for months; nerves, kidneys, blood, brain, unborn babies
- If you have taken any: stop, keep the packet, ask a doctor for blood lead and heavy-metal testing
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What a kushta actually is
The word comes from kushtan, to kill or to subdue. In classical Unani and Ayurvedic pharmacy, a metal was “killed” by repeated cycles of grinding with plant juices, sealing in a clay crucible, and firing in a pit of dried dung cakes, sometimes dozens of times, until the metal lost its shine and became a light, fine powder that would float on water and slide into the lines of a fingertip. The old texts prized this as a way to make metals absorbable and to give a tiny dose great potency.
The intention was sincere. The chemistry is the problem. Firing does not turn lead into something else. A kushta of lead is still lead, now as an oxide, in a form the gut absorbs readily. The same is true of mercury and arsenic. The traditional idea that calcination “detoxifies” a metal is where the tradition and the periodic table part company.
The names to know
You will not see “lead” on a packet. You will see the Unani or Ayurvedic name of the raw material. These are the ones to recognise, grouped by what they are made of.
| Name on the label | What it is | Concern |
|---|---|---|
| Kushta Surb, Kushta Seesa, Naag Bhasma | Lead | Lead poisoning |
| Kushta Seemab, Kushta Shangraf, Ras Sindoor | Mercury, cinnabar (mercury sulfide) | Mercury poisoning |
| Kushta Sammul Far, Kushta Hartal, Kushta Sankhiya | Arsenic oxide, orpiment (arsenic sulfide) | Arsenic poisoning |
| Kushta Faulad, Kushta Khabsul Hadeed | Iron | Iron overload; often contaminated with lead |
| Kushta Jast, Kushta Qalai | Zinc, tin | Purity; may carry lead as a contaminant |
| Kushta Tila, Kushta Nuqra | Gold, silver | Mostly inert; often adulterated or mislabelled |
| Kushta Sadaf, Kushta Marjan, Kushta Baiza Murgh | Shell, coral, eggshell (calcium) | Low risk in themselves; still unregulated |
Two points matter more than the individual names. First, the “safe” calcium and iron kushtas are made by the same hands in the same crucibles, and analyses of unlicensed products repeatedly turn up lead where none should be. Second, kushtas are rarely sold alone. They are folded into majoons, powders and “taqat” pills, so a product that never says kushta anywhere can still contain one. That is why an ingredient list you can read matters so much; our guide to checking a herbal product’s DRAP enlistment covers what a label must show.
Why lead, mercury and arsenic are the real danger
Three things make these metals uniquely bad in a daily “tonic”. They accumulate: the body clears them slowly, so a small amount every morning builds for months. They have no safe level: for lead in particular, damage to a child’s developing brain happens at exposures too small to cause any obvious symptom. And the first symptoms are vague: tiredness, poor appetite, constipation, a bad mood, aching joints. Exactly the complaints a person was taking the kushta for. So they take more. Our companion piece on heavy metals in herbal, Ayurvedic and Unani medicine covers how a lab report reads and who is most at risk.
Lead
Colicky stomach pain that comes and goes, stubborn constipation, tiredness, pale skin from anaemia, headaches, poor concentration and memory, irritability, and in heavier poisoning a bluish line along the gums and weakness of the wrist or foot. In pregnancy, lead crosses to the baby. In children it lowers intelligence, permanently, with no threshold.
Mercury
A fine tremor of the hands, a metallic taste, sore or bleeding gums, drooling, shyness and irritability that the family notices before the person does, numbness or tingling, and kidney damage that shows as protein in the urine. Mercury also crosses the placenta and gets into breast milk.
Arsenic
Vomiting and watery diarrhoea early on; then, over months, darkening of the skin in a “raindrop” pattern, thickened rough patches on palms and soles, white bands across the fingernails, and burning or numb feet from nerve damage. Long-term arsenic exposure raises the risk of skin, bladder and lung cancers.
The symptoms of the poison look like the weakness the tonic was sold for.
Why no “taqat ki dawai” is worth it
Stamina, sexual weakness and general tiredness are the biggest market for kushta-based products, and the reasoning offered is that a metal gives strength that plants cannot. Here is the honest position. Tiredness has causes that can be tested: low iron, low thyroid, low vitamin D and B12, poor sleep, sleep apnoea, depression, uncontrolled diabetes. Erectile problems in men under 50 can be an early sign of diabetes, high blood pressure or a heart problem, and the fix is finding that. None of these is helped by lead. Some are made worse, since lead itself lowers sperm quality and testosterone.
There is a second reason. Products sold for stamina are the ones most often found, on testing, to contain undeclared sildenafil (the drug in Viagra) or steroids alongside or instead of the herbs. A man with a heart condition taking nitrate medicines can be seriously harmed by hidden sildenafil. So a “herbal” stamina majoon carries two risks stacked on top of each other, and no honest maker would need either.
Classical hakeems did not hand out kushta casually. The texts describe it as a last resort, prescribed in grain-sized amounts for short periods, with the maker’s reputation staked on the firing being complete. Even by that standard, the premise that firing made metals safe was a belief of its era, not a finding. Modern Unani colleges in Pakistan and India teach pharmacology alongside the classics, and many qualified hakeems now avoid metallic kushtas entirely. The people still selling them freely are, as a rule, not those hakeems.
What to do if you or someone at home has been taking one
- Stop today. Do not taper. There is nothing in a kushta that the body needs to be weaned from.
- Keep the packet, jar or paper wrap and note roughly how much was taken and for how many weeks or months. A doctor and, if it comes to it, a laboratory will want this.
- Ask a doctor for testing. A blood lead level is a routine test in most city laboratories in Pakistan; ask for mercury and arsenic too if the product’s name or purpose suggests them. Take the packet along. Say plainly “I have been taking a Unani metal preparation” so nobody wastes 3 visits guessing.
- Check the children. If a child in the house has had any of the product, even a lick from a spoon, they need a blood lead test regardless of symptoms. Test any pregnant or breastfeeding woman in the house too.
- Do not try home “chelation”. Coriander juice, garlic, “detox” powders and similar do not remove metals. Chelation is a hospital treatment with its own risks, given only when a blood level justifies it.
- Report it. DRAP takes complaints about alternative medicine products. Keep the seller’s name, page or address.
Go to a hospital now for: severe stomach pain with vomiting after taking any metallic preparation; a fit or seizure; confusion, drowsiness or a child who is hard to wake; sudden weakness of a limb or slurred speech; bloody or black stools; passing very little urine. Also see a doctor within days for the slow signs: unexplained anaemia, constipation with colic, numb or burning feet, a hand tremor, darkening skin patches, bleeding gums, or tiredness that has lasted more than a month. Never give a kushta or a “taqat” majoon to a child, a pregnant or breastfeeding woman, or anyone with kidney disease. Anyone on blood pressure, diabetes, thyroid or heart medicine should tell their doctor about every traditional product they use, especially anything sold for stamina, because hidden sildenafil and steroids interact with those medicines.
Myth: a good hakeem’s kushta is properly made and therefore safe
Careful firing changes the form of a metal, not its identity. The most skilfully made lead kushta on earth is still lead oxide, and it is absorbed better, not worse, for being finely ground. The reputation of the maker tells you they are consistent. It cannot tell you lead has stopped being lead.
Most of the Unani shelf is a matter of honest expectations and sensible cautions; the forms explained in our preparation guide are sweet herb pastes and syrups you can take or leave. Kushta is different in kind, which is why it gets its own article in Unani & Herbal, Decoded. Leave it on the shelf.
Straight answers on kushta and metals
What is kushta?
Kushta is a metal, mineral, shell or gem that’s been ground with plant juices and fired in a sealed clay crucible, often many times over, until it becomes a fine ash. Ayurveda calls the same thing bhasma. The worry is the metals most often used: lead, mercury and arsenic.
Is kushta safe?
Kushtas made from lead, mercury or arsenic are unsafe by definition, because firing changes a metal’s form, not what it is. Shell, coral and eggshell kushtas are essentially calcium and low risk in themselves, but they’re made in the same workshops without testing and are often contaminated with lead. Since you can’t tell by looking, the practical rule is to avoid the whole class.
Doesn’t firing (calcination) make the metal safe?
No. Firing turns lead into lead oxide, still lead, and fine grinding makes it easier for the gut to absorb, not harder. The belief that calcination made metals safe belonged to its era. However skilled the maker, lead doesn’t stop being lead.
What are the symptoms of lead poisoning from kushta?
Early signs are vague: tiredness, poor appetite, constipation, colicky stomach pain, headaches, irritability and pale skin from anaemia. Heavier poisoning can bring a bluish line on the gums and weakness of the wrist or foot. The cruel part is that these look like the weakness the tonic was bought for, so people take more.
I’ve been taking a kushta. What should I do now?
Stop today; there’s nothing to taper. Keep the packet and note roughly how much you took and for how long. Ask a doctor for a blood lead test, plus mercury and arsenic if the product suggests them, and say plainly that you’ve been taking a Unani metal preparation. If any child at home had even a lick of it, they need a lead test too.
How would I know if a majoon or taqat product contains kushta?
Often you can’t. Look in the ingredient list for kushta, bhasma, sindoor, ras, or names like Kushta Surb, Seesa, Seemab, Shangraf, Hartal or Sankhiya. A stamina product with no ingredient list at all should be assumed to contain something you wouldn’t choose, whether a metal or a hidden drug.
Is kushta good for mardana taqat or stamina?
There’s no honest case for it. Tiredness and erection problems have testable causes: low iron, thyroid, vitamin D or B12, poor sleep, diabetes, high BP or heart trouble. Lead lowers sperm quality and testosterone, and stamina products are the ones most often found to hide sildenafil or steroids. A doctor finding the cause is the better spend.
Is kushta dangerous in pregnancy or for children?
Very much so. Lead and mercury cross the placenta, and mercury reaches breast milk. In children, lead lowers intelligence permanently and there’s no safe threshold. Never give any kushta or taqat majoon to a child or to a pregnant or breastfeeding woman, and test any pregnant woman at home who has taken one.
Which kushta names contain lead, mercury or arsenic?
Lead: Kushta Surb, Kushta Seesa, Naag Bhasma. Mercury: Kushta Seemab, Kushta Shangraf, Ras Sindoor. Arsenic: Kushta Sammul Far, Kushta Hartal, Kushta Sankhiya. Iron, zinc and tin kushtas (Faulad, Jast, Qalai) are often found carrying lead as a contaminant.
Can heavy metals be removed from the body at home?
No. Coriander juice, garlic and the powders sold as cleanses don’t bind or remove lead, mercury or arsenic in any meaningful amount. Chelation is a hospital treatment with its own risks, given only when a blood level justifies it.
My blood lead test came back slightly raised. Is that fine?
Take it seriously. For children and pregnant women no level is considered safe, and a raised result means lead is getting in from somewhere. A doctor will look for the source, recheck in a few weeks and decide whether treatment is needed.
When is kushta poisoning an emergency?
Go to hospital now for severe stomach pain with vomiting after a metallic preparation, a fit, confusion or a child who’s hard to wake, sudden limb weakness or slurred speech, black or bloody stools, or passing very little urine. Slower signs like a hand tremor, numb or burning feet, darkening skin patches or bleeding gums need a doctor within days.
Is Ayurvedic bhasma the same problem as kushta?
Yes. Bhasma is the Ayurvedic word for the same process, and naag bhasma (lead) and ras sindoor (mercury) carry identical risks. Testing of both imported and local Ayurvedic products has turned up the same metals.
Are gold or silver kushtas worth the money?
Gold and silver are largely inert in the gut, so a genuine one mostly passes straight through. The real problems are the price, frequent fakes and substitutions, and contamination from the same crucibles. There’s no benefit that justifies the gamble.
Can I take kushta with BP, sugar or heart medicine?
Don’t take it at all, and tell your doctor about every traditional product you use. Stamina products in particular may hide sildenafil or steroids, which interact with heart, BP and diabetes medicines; hidden sildenafil with nitrate heart tablets can be dangerous. Kidney disease is another firm reason to stay away.