Suppose you read that Ayurvedic supplements sometimes contain lead or mercury, and you decide to be careful. You skip anything imported, buy from an American company, and look for “Good Manufacturing Practices” on the bottle. That is a sensible plan, and the best evidence available says it would not have protected you.
In 2008, a research team published in JAMA the results of buying Ayurvedic products from 25 websites. They identified 673 products, randomly selected 230, received 193 and measured them with x-ray fluorescence. One in five contained detectable lead, mercury or arsenic. Products made in the United States tested positive 21.7 percent of the time. Products made in India tested positive 19.5 percent of the time. The statistical comparison between those two figures came out at P equals 0.86, which in plain terms means the difference is indistinguishable from chance.
Two further numbers from the same paper finish the thought. Of the products that did contain metals, 95 percent were sold by American websites. And 75 percent of them carried a claim of Good Manufacturing Practices.
There is one more thing, and it is the part most coverage skips. Some of the metal in some of these products is not contamination at all. It is the formulation. Those are two entirely different problems, both real, and an article that collapses them tells you nothing useful.
What the 2008 study measured
The study design matters because it was built to answer the import question directly. The researchers bought in August through October 2005, recorded the country of manufacture and whether the product belonged to a specific branch of the tradition, and then ran one set of measurements across all of it.
Overall, 20.7 percent of the 193 products contained a detectable toxic metal, with a 95 percent confidence interval running from 15.2 to 27.1 percent. That interval is the honest version of “one in five”: the true share in that market sat somewhere in that band. Every single metal-containing product exceeded at least one standard for acceptable daily intake.
The Good Manufacturing Practices finding deserves a moment of its own, because the phrase is doing enormous work on product labels. It refers to process controls, meaning records, cleanliness, identity testing and consistency between batches. It is not a certificate that a laboratory measured this bottle for heavy metals and found none. In this study, three quarters of the products that did contain lead, mercury or arsenic said it anyway. A claim that correlates with nothing is not a safety signal. What the numbers on a botanical label do and do not verify is handled in this library’s article on extract labels, and the broader enforcement machinery in its article on contamination.
So the obvious precaution fails. Country of manufacture predicted nothing here. A manufacturing claim predicted nothing. Something else predicted a great deal.
The earlier study, in a different aisle
Four years before the internet study, the same lead researcher published a survey of physical stores. Between April 25 and October 24, 2003, the team visited every shop within 20 miles of Boston City Hall that sold South Asian Ayurvedic products and bought every distinct product they stocked.
Fourteen of 70 products, or 20 percent, contained heavy metals. The concentrations are where the story is. For lead, 13 products, median 40 micrograms per gram, ranging up to 37,000. For arsenic, 6 products, median 430, ranging up to 8,130. For mercury, 6 products, median 20,225 micrograms per gram, ranging up to 104,000.
That mercury median is hard to feel in those units, so convert it. Twenty thousand micrograms per gram is 2 percent of the product by weight. A tenth of an ounce of such a powder carries roughly 60 milligrams of mercury. The researchers calculated that if taken at the dose the manufacturer recommended, each of the 14 products could push a person above published regulatory limits.
Taken together, the two studies cover the two channels Americans use: a neighborhood shop and a search engine. The result was close to identical.
Two features of those ranges are worth noticing, because they explain why spot testing by consumers is hopeless. The spread is enormous. Lead ran from 5 micrograms per gram to 37,000, a factor of more than seven thousand between the cleanest and the dirtiest product in a single sample of seventy. And the median tells you almost nothing about the extreme, which is the bottle that hurts someone. A market where most products are fine and a few are catastrophic is exactly the market in which personal caution performs worst.
When the metal is the recipe, not the accident
Here the article has to do two things in order, and keeping them apart is the whole job.
What the tradition says it is doing
Ayurveda includes a branch devoted to processed metals and minerals. Researchers at India’s Central Council for Research in Ayurvedic Sciences, a government body, describe it in a 2018 paper as a distinct branch of the system that uses processed metals and minerals in combination with plant material. The finished preparations are called bhasmas, a word usually translated as calx or ash.
The tradition’s account of why these are safe rests on the processing. Writing in the journal Ayu in 2015, practitioners from the department of Rasa Shastra at Banaras Hindu University call shodhana and marana “a series of complex procedures that identify the undesirable effects of heavy metals/minerals and convert them into absorbable and assimilable forms.” Read that wording closely. It says the procedures identify the undesirable effects and change the form the metal is in. It does not say they take the metal out, and the sentence appears only in the paper’s abstract, nowhere in the paper itself. Later work from the same field reports preparations ground to particles measured in hundreds of nanometres after repeated firings at controlled temperatures.
That is the tradition’s reasoning, reported as the tradition’s reasoning. It is a theory of transformation, not a measurement. The National Center for Complementary and Integrative Health, in a fact sheet last updated in January 2019, notes without comment that Ayurvedic treatment combines products mainly derived from plants but which may also include animal, metal and mineral material.
What the instruments found
Now the measurements, separately. The 2018 government-council paper put a classical multi-ingredient formulation through x-ray diffraction and identified cinnabar, which is mercury sulfide, cassiterite, which is tin oxide, litharge, which is lead oxide, and two iron oxides. Those are the crystalline forms the named ingredients are supposed to produce. The metals were there because the recipe put them there.
The 2008 JAMA study measured the consequence across a market. Products from this branch of the tradition tested positive 40.6 percent of the time against 17.1 percent for the rest, a difference with P equals 0.007. Median lead ran 11.5 micrograms per gram against 7.0. Median mercury ran 20,800 micrograms per gram against 34.5.
Neither half cancels the other. A deliberate preparation is not a supply-chain failure, and saying so is not a safety finding. A measured 20,800 micrograms of mercury per gram is not made safe by the reasoning behind it, and the tradition’s reasoning is not refuted by the measurement either. Both sentences are true, and a reader who holds both of them knows more than one who picks a side.
One point of precision. When FDA warned about these products in December 2025, it did not mention this branch of the tradition and did not say whether metals had been added on purpose. That distinction belongs to the published research, not to the agency, and nobody should put it in FDA’s mouth.
What poisoning looked like in five states
Concentrations in a laboratory are abstract. A federal case series is not.
In July 2004 the Centers for Disease Control and Prevention reported 12 adult lead poisoning cases linked to Ayurvedic medications across New Hampshire, California, Massachusetts, New York and Texas between 2000 and 2003. Three were described in detail.
A 37-year-old woman in New Hampshire presented with a blood lead level of 81 micrograms per deciliter. After chelation therapy it fell to 35. Two years later it was 64. A 31-year-old woman in California started at 112, fell to 71 after ten days, and reached 22 roughly nine and a half months later. A 34-year-old man in California started at 80 and was down to 17 within about seven and a half months.
The New Hampshire trajectory is the one to remember, because it shows what treatment can and cannot do. Chelation lowered her lead. Continued exposure put it back. CDC’s editorial note states that primary management of lead toxicity is source identification and exposure cessation, and advises that a high blood lead level without an obvious occupational or environmental source should prompt questions about traditional or folk medications.
That last sentence is the practical one, and it cuts both ways. If you take Ayurvedic preparations and have unexplained symptoms, the clinician cannot ask the right question unless you volunteer the answer. Fatigue, abdominal pain, constipation, headache, irritability, numbness or tingling in the hands and feet, anemia on a routine blood count, or any pregnancy while taking these products are all reasons to bring the actual containers to a physician and ask directly about blood lead testing. The decision about testing and treatment is a clinician’s. Handing over the bottles is yours.
What these products legally are in the United States
Two federal pages seem to say opposite things, and the gap between them is worth understanding because it governs what you can expect from a label.
The complementary health center’s fact sheet says there is no significant regulation of Ayurvedic practice or education in the United States, and that no state requires a practitioner to hold a license. FDA, on a page under its fraudulent products section with content current as of December 2, 2025, says flatly that there are no FDA-approved ayurvedic products and that ayurvedic products marketed to prevent, treat, diagnose or cure any disease are illegally marketed in the country.
Unregulated and illegal sound like contradictions. They are not. The claim decides the category. A product sold to treat a named disease is, by that claim, an unapproved new drug, and selling it is unlawful. The same powder sold with a general statement about supporting digestion is a dietary supplement, which reaches the shelf with no pre-market review of safety or effectiveness at all. Which claim types trigger which regime is set out in this library’s article on claim language, and the dietary supplement framework in its Category 10 articles.
FDA’s December 2025 warning is specific. Laboratory testing of a product called Rheumacare Ayurvedic Proprietary Medicine, bought from a website called NavaFresh.com, found high levels of lead and mercury along with strychnine, brucine toxins and arsenic. The testing followed a report from a consumer who, in the agency’s words, had extremely elevated blood lead levels. FDA gives no number and no case count, and none should be invented. The agency also notes that such products typically are not labeled to contain heavy metals at all.
Notice where FDA files this: not under supplements, not under herbs, but under fraudulent products. That filing decision is itself a statement.
The framework, and what the trials show
Ayurveda’s own explanatory system is not well served by federal consumer pages. Neither of the two described above mentions prakriti or the doshas at all, so this article takes the terms from the tradition’s own literature.
A 2026 scoping review by researchers at the University of Trans-Disciplinary Health Sciences and Technology in Bengaluru describes prakriti as an individual’s distinctive body constitution, or psychosomatic temperament, and presents it as a framework for understanding who is predisposed to what. Reviewing 27 studies of stroke patients, the authors conclude that this kind of profiling is frequently left out of research altogether. That is the tradition’s category, described by people working inside it, and it is a claim about classification rather than about physiology.
On effectiveness, the federal fact sheet’s key sentence is genuinely ambiguous in English, so it is better quoted than paraphrased: “Few well-designed clinical trials and systematic research reviews suggest that Ayurvedic approaches are effective.” Read either way, the page is not endorsing anything. It describes a 2013 trial of 440 people with knee osteoarthritis in which two Ayurvedic plant-extract formulations performed similarly to glucosamine sulfate and celecoxib, and a short trial of 89 people suggesting a five-herb formulation might help manage type 2 diabetes, while noting that most such trials are small or poorly designed.
Graded honestly, nearly every Ayurvedic claim a U.S. consumer will encounter sits in the category of insufficient evidence to assess, and the reason is that the trials are too few and too weak rather than that they came out negative. The page also reports that about 240,000 American adults use Ayurvedic medicine, with no survey year attached to that figure anywhere on it.
The system India has built
An American reader who pictures village herbalism is picturing something other than what exists. The numbers come from answers the Ministry of Ayush gave in India’s lower house of parliament, which carry explicit as-on dates.
As of January 1, 2023, India recorded 355,416 registered Ayurveda practitioners, out of 751,768 across all the systems the ministry covers. As of April 1, 2023, there were 541 Ayurveda colleges within a total of 942, and 37,804 dispensaries counting those run by central government bodies.
One figure deserves a flag. A separate ministry answer, from August 2024, gives 453 Ayurveda colleges as of April 1, 2022. The 541 figure comes from a December 2024 answer about the following year. That is an increase of 88 colleges in twelve months, stated in two documents from the same ministry and the same minister. Both numbers are reported here with their dates, and neither is averaged into a trend.
The legal structure is statutory, not customary. The National Commission for Indian System of Medicine was created under an Act of 2020 whose provisions took effect on June 11, 2021, replacing a central council Act from 1970 that has been repealed. Its remit covers Ayurveda, Unani, Siddha and Sowa-Rigpa, and on the commission’s own page that is the entire list. Homoeopathy is not on it. Neither are yoga and naturopathy, which is worth knowing before treating “Ministry of Ayush” as a single regulator.
None of that structure follows the products to the United States, and none of it reaches practitioners here.
That last point is worth sitting with, because it surprises people. An Ayurvedic practitioner in India completes a degree at a college inside that statutory system and appears on a register maintained under national law. A person advertising Ayurvedic consultations in an American strip mall is working in a field where, according to the federal fact sheet, no state requires a practitioner to hold a license. There is no state board to register with, no examination to fail and no license to lose.
A certificate on the wall of such an office may be real and may represent genuine study. It is still a private credential, not a license, and the two confer different things: a license comes with a regulator, a complaint process and a defined scope of practice, and a private certificate comes with none of those. How to read the letters after a name, and what a license does and does not promise, are questions this library handles in its own articles. They are worth reading before reading a wall.
What to do about a cabinet you already own
Three questions, written for this article, that can be answered without a laboratory.
- Does the product name or ingredient list include a bhasma, a sindura, a rasa, or any metal or mineral by name? If so, the metal may be deliberate, and the amount is unlikely to be on the label.
- Is the seller making a claim about a disease? That claim is what makes a product unlawful rather than merely unreviewed, and it tells you how the seller thinks about rules.
- Has anyone who prescribes your medications ever seen these containers? Several of the documented poisonings were found only when a clinician asked.
If you are pregnant, trying to conceive, or giving anything of this kind to a child, that conversation is not optional and it is not something to postpone. Lead crosses the placenta.
The single most useful correction in this subject is also the least satisfying. There is no shortcut that sorts safe from unsafe at the point of purchase. The label’s origin did not work. The manufacturing claim did not work. What distinguished the higher-risk products in the only study designed to test it was which branch of the tradition they came from, and that is a fact about the recipe, not about the country, the company or the price.
Sources
- Saper RB, Phillips RS, Sehgal A, et al.. “Lead, mercury, and arsenic in US- and Indian-manufactured Ayurvedic medicines sold via the Internet. JAMA, 2008;300(8):915-23. PubMed. DOI: 10.1001/jama.300.8.915.” pubmed.ncbi.nlm.nih.gov
- Saper RB, Kales SN, Paquin J, et al.. “Heavy metal content of ayurvedic herbal medicine products. JAMA, 2004;292(23):2868-73. PubMed. DOI: 10.1001/jama.292.23.2868.” pubmed.ncbi.nlm.nih.gov
- Centers for Disease Control and Prevention. “Lead Poisoning Associated with Ayurvedic Medications: Five States, 2000-2003. MMWR 2004;53(26):582 (July 9, 2004).” cdc.gov
- U.S. Food and Drug Administration. “FDA Warns About Heavy Metal Poisoning Associated with Certain Unapproved Ayurvedic Drug Products (Fraudulent Products; content current as of December 2, 2025).” fda.gov
- National Center for Complementary and Integrative Health, National Institutes of Health. “Ayurvedic Medicine: In Depth (content last updated January 2019).” nccih.nih.gov
- Singh A, Ota S, Srikanth N, Galib R, Bojja S, Dhiman KS. “Application of Spectroscopic and Chromatographic Methods for Chemical Characterization of an Ayurvedic Herbo-Mineral Preparation: Maha Yograja Guggulu. J Evid Based Integr Med, 2018;23. PubMed. DOI: 10.1177/2156587217751761.” pubmed.ncbi.nlm.nih.gov
- Gupta RK, Lakshmi V, Jha CB. “X-Ray Diffraction of different samples of Swarna Makshika Bhasma. Ayu, 2015;36(2):225-9. PubMed. DOI: 10.4103/0974-8520.175547.” pubmed.ncbi.nlm.nih.gov
- Singh TR, Gupta LN, Kumar N. “Standard manufacturing procedure of Teekshna lauha bhasma. J Ayurveda Integr Med, 2016;7(2):100-8. PubMed. DOI: 10.1016/j.jaim.2015.08.003.” pubmed.ncbi.nlm.nih.gov
- Shravanthi S, Sharma SV, Sindhu A, et al.. “Exploring the Prakriti (Body Constitution) of Stroke Patients: A Scoping Review From an Ayurvedic Perspective. Cureus, 2026;18(1):e102368. PubMed. DOI: 10.7759/cureus.102368.” pubmed.ncbi.nlm.nih.gov
- Ministry of Ayush, Government of India. “Lok Sabha Unstarred Question No. 3048, answered 13 December 2024 (registered AYUSH practitioners as on 1 January 2023; colleges and dispensaries as on 1 April 2023).” eparlib.sansad.in
- Ministry of Ayush, Government of India. “Lok Sabha Unstarred Question No. 1858, answered 2 August 2024 (AYUSH colleges as on 1 April 2022; practitioners as on 1 January 2022).”
- National Commission for Indian System of Medicine, Government of India. “About the Commission (NCISM Act 2020, 14 of 2020; in force 11 June 2021; repeal of the Indian Medicine Central Council Act 1970).” ncismindia.org