Heavy Metals in Herbal, Ayurvedic and Unani Medicine: Signs and Tests
The most dangerous thing in a herbal medicine is often not a herb. Heavy metals in Ayurvedic medicine, in Unani kushta and in plain herbal powders, chiefly lead, mercury and arsenic, turn up again and again in lab testing, sometimes by design and sometimes by accident, and the people they hurt most are the ones with the least margin: pregnant women and children.
Before you start
- Three routes in: deliberate metal ingredients (rasa shastra bhasma, Unani kushta), contamination (soil, grinding, storage), and adulteration (colours, fillers).
- Highest risk products: anything “for taqat”, for men’s stamina, for children’s growth, for fertility, or described as a bhasma, kushta, ras or sindoor.
- The test: a blood lead level; urine for mercury and arsenic. Cheap, ordinary, available in any large city lab.
- Golden rule: stop, keep the packet, get tested. No home remedy removes a metal.
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Why metals end up in a “herbal” medicine
Three separate reasons, and they need separating, because the fix is different for each.
1. They were put there on purpose
Ayurveda’s rasa shastra branch, and Unani’s kushta tradition, deliberately use metals and minerals. Lead, mercury, arsenic, gold, silver, iron and copper are heated, quenched and ground through long cycles into a fine ash (bhasma, or kushta) that the classical texts describe as “purified” and therapeutic. The intention is traditional and sincere. The chemistry is less forgiving: a properly made preparation may still deliver lead, and a badly made one certainly will, and in Pakistan and India these are sold openly as strength tonics, fertility aids and children’s growth powders. Kushta gets its own article in this series; here the point is simply that a product family exists where metal is the ingredient, not the contaminant.
2. They got in by accident
Herbs grow in soil. Roadside soil, industrial soil, soil watered from a drain. Roots absorb lead and arsenic, and drying on the ground, grinding in old metal mills, storing in painted tins or wrapping in newsprint all add more. This is why a plain powder like amla, ashwagandha or triphala can test high without anyone intending harm.
3. They were added as adulterants
Bright colours sell. Lead chromate gives a warm yellow, red lead a rich orange, and some sindoor and “haldi” powders have tested positive for exactly these. Cheap fillers, chalk and clay also carry metals of their own.
What heavy metals in Ayurvedic medicine do to the body
Slowly. That is the problem. Nobody collapses after one spoon. Weeks or months in, the symptoms are vague enough to be blamed on anything.
| Metal | Common early signs | Later or serious signs |
|---|---|---|
| Lead | Constipation, colicky belly pain, tiredness, irritability, poor appetite, headache | Anaemia, tingling or weakness in hands and feet, memory and mood change, kidney damage, in children slowed development |
| Mercury | Metallic taste, sore gums, tremor, sleeplessness, mood swings | Kidney damage, coordination problems, in pregnancy harm to the baby’s brain |
| Arsenic | Nausea, diarrhoea, skin darkening, small hard spots on palms and soles | Nerve damage, anaemia, raised long-term cancer risk |
The pattern to notice is a person taking a daily “tonic” whose belly pain, constipation and tiredness keep getting checked for ulcers and thyroid while the tonic is never mentioned. Ask about the tonic.
Nobody collapses after one spoon. That is what makes a metal in a tonic so hard to catch.
Who is most at risk
Pregnant women first. Lead crosses the placenta freely, and a mother’s own bone stores of lead can be released during pregnancy and breastfeeding, so a woman who took a metallic preparation years ago is not entirely in the clear. Children next: their bodies absorb a far larger share of swallowed lead than adults do, and the developing brain is the organ that pays. There is no blood lead level that is considered harmless for a child. Then anyone with kidney disease, anyone anaemic, and anyone taking a product every day for months, because dose over time is what fills the body’s stores.
Never give a bhasma, kushta, “growth” powder or strength tonic to a child, and never take one in pregnancy or while breastfeeding, whatever the label promises. Stop any such product immediately if you notice belly pain with constipation, a metallic taste, tremor, tingling in the hands or feet, unexplained anaemia, or yellowing of the eyes. Seek same-day help for a fit, severe vomiting, confusion, or a child who is unusually drowsy after any powder. Chelation (medicine that binds metals) is a specialist hospital treatment given only for confirmed high levels; nothing sold as a “detox” removes metals, and some of those products have tested high themselves. Tell your doctor every traditional product you take before any medicine is changed.
What a lab report actually looks like
You can test the person, the product, or both. Testing the person is more useful.
- Ask any large diagnostic lab for a blood lead level. It needs about 2 to 3 ml of blood in a special (usually royal blue or tan top) tube, and results are reported in micrograms per decilitre (µg/dL).
- Read the number, not the colour code. Many labs print an adult reference of under 5 µg/dL and flag anything above; for children, most modern guidance treats 3.5 µg/dL as the level for action, 45 µg/dL or more in a child is a hospital matter, and adults are admitted at that level with symptoms or at higher levels without. There is no “normal” lead, only lower.
- For mercury and arsenic, the usual test is a 24-hour urine collection or a spot urine sample, reported in micrograms per litre. Avoid seafood for 3 days before an arsenic test, because fish contains a harmless form that inflates the number.
- Add a full blood count (looking for anaemia) and kidney function (creatinine). Lead often shows up first as low haemoglobin with an odd blood film.
- To test the product itself, send 10 to 20 g of powder or one full sachet, still in its packaging, to a lab that offers ICP-MS or atomic absorption testing. Results come back as milligrams per kilogram (mg/kg, the same as parts per million). Pharmacopoeia limits for herbal products are typically around 10 mg/kg for lead, a few mg/kg for arsenic and about 1 mg/kg for mercury; a bhasma can come back in the thousands.
- Take every result to a doctor. A single number without the daily dose and duration is only half the story.
If you have been taking one
First, breathe. Most people who took a product for a few weeks and feel well will test low and can simply stop. The steps are the same either way.
Stop today. The jar does not get finished “so it isn’t wasted”. Keep the packaging, the receipt and any leftover product in a sealed bag, because you may want it tested and a doctor will want to see the label. Write down how much you took (spoons, tablets or grams), how often, and for how long, and note whether anyone else in the house, especially a child, was given the same thing. Book the blood lead test and, if the product was a kushta, bhasma or a “taqat” tonic of unknown make, the urine metals as well. Then, while you wait, eat properly: regular meals, enough iron and calcium from daal, eggs, meat, dahi and green sabzi, because an empty stomach and low iron both increase how much lead the gut absorbs. That is the only “food remedy” that genuinely helps. There is no herb, no juice and no water fast that pulls a metal out of bone.
If a level comes back raised, the doctor’s job is to find and remove the source (sometimes it is not the tonic at all but a paint, a cosmetic, a water pipe, a surma, a fake salajeet or a workplace), to recheck after a few weeks, and to refer for chelation only if the level is high enough to justify a treatment that has its own risks.
Classical rasa shastra and Unani texts spend page after page on purification (shodhana, tadbeer) precisely because the authors knew raw metals were poisons. Their tests for a finished bhasma were physical: it should float on water, leave no grit between the fingers, and not return to metal when heated. Those tests check texture. They cannot check what the modern lab checks, which is how many milligrams of lead a spoon delivers.
How to lower your risk when buying
Read the label and refuse anything without one. The label guide in this series shows what a batch number, an enlistment number and a full manufacturer address look like. Refuse any product described as kushta, bhasma, ras, sindoor or “with metals” unless a qualified practitioner has prescribed it and you have discussed the metal question directly. Be wary of unusually bright yellow, red or orange powders. Prefer whole herbs you can recognise (a dried amla, a giloy stem, a root of mulethi) over anonymous powders, and buy from shops that turn stock over quickly. Mistrust “for strength”, “for men”, “for growth” and “for fertility” most of all, since these are the categories where metals have most often been found. And before starting any daily traditional product, read the ten ingredients that can hurt you for the plant-side risks that sit alongside the metal ones.
The rest of Unani & Herbal, Decoded takes the same line: respect the tradition, test the product.
Myth: a reputable brand cannot contain metals
Well-known manufacturers have been named in independent tests more than once, usually for contamination rather than intent. A familiar name lowers the odds. It does not remove them, and it is no substitute for a batch number you can trace.
Do all Ayurvedic and Unani medicines contain heavy metals?
No. Plain herbal powders, syrups and majoon usually do not contain deliberate metals, though contamination can still happen. Bhasma, kushta, ras and sindoor preparations contain them by design.
Can heavy metal poisoning be reversed?
Blood levels fall once the source stops, and mild cases recover fully. Lead stored in bone leaves slowly over years, and damage to a child’s development or to kidneys may not fully reverse, which is why prevention matters.
Is it safe to take a bhasma or kushta in pregnancy?
No. Lead and mercury cross the placenta and affect the baby’s brain. Stop and tell your antenatal doctor what you took and for how long.
What blood lead level is dangerous?
There is no safe level. Most labs flag adult results above 5 µg/dL, children need action from 3.5 µg/dL, and 45 µg/dL or higher in a child usually means hospital treatment; adults are treated at that level with symptoms, or at higher levels.
Can I test the product at home?
No reliable home test exists for powders. Lab testing (ICP-MS or atomic absorption) on 10 to 20 g of product is the only meaningful check.
Does a “detox” or a liver cleanse remove lead?
No. Only stopping the source and, for confirmed high levels, medical chelation lower body lead. Good iron and calcium intake reduces further absorption, which is a real but modest help.
Are children’s growth or appetite powders from hakeems safe?
Treat them with the most suspicion of all. Several such products have tested high for lead, and a child absorbs far more of it than an adult. Ask for the ingredient list and enlistment number; if either is missing, do not give it.