Herbalism for the Woo-Allergic

You probably haven't thought much about herbs. Oregano is good on garlic bread. Mint helps with the breath situation. Maybe you took echinacea once when you felt a cold coming on. In your mind, the category sits adjacent to essential oils, crystal healing, and the woman at the farmers market who wants to talk to you about your aura. You are a science-literate adult. You have things to do.

In 2007, a research team ran a randomized, double-blind clinical trial comparing a standardized hibiscus extract against lisinopril, the workhorse ACE inhibitor that has been first-line treatment for hypertension for forty years. The hibiscus delivered a clinically meaningful blood pressure reduction. Less than the lisinopril, but real, and with the safety profile of a tea. Head to head against one of the most prescribed pharmaceuticals on earth, in a real journal, with the methodology you would demand. You have not heard of this study. There are hundreds like it.

Ginger did not waltz into cancer treatment protocols by superstition. It has been tested in randomized trials. Peppermint oil for IBS appears in gastroenterology guidelines. St. John's Wort for mild-to-moderate depression has a Cochrane review behind it. The evidence base for plant medicine is not what most people have been led to assume, which raises a more interesting question than whether herbs work.

The interesting question is why you didn't know they did.

The answer is a history, and one of the stranger ones in American medicine, which is saying something.

Stop and ask yourself a question. How did doctors get so much power? Not the soft cultural authority of the man in the white coat. The actual legal monopoly. The exclusive right to diagnose, to prescribe, to cut, to certify death, to commit you against your will. That is an enormous concentration of power in a single profession. Where did it come from?

Most people assume it was always there. That medicine emerged fully formed from some scientific evolution and licensing followed naturally. It did not. The American Medical Association was founded in 1847 and for its first sixty years was one voice among many in a noisy, pluralistic medical landscape. The consolidation happened in a specific window, for specific reasons, through a specific mechanism.

In 1900, if you got sick in America, you had options. You could see a regular physician, what was then called an allopath, trained in the heroic medicine of the era. Heroic medicine meant bleeding, blistering, purging, and the liberal application of mercury and other substances we now classify as poisons. The allopaths killed a lot of people. They probably killed George Washington. And they killed a meaningful share of every cohort that could afford them. You could also see an eclectic physician, trained in a school of medicine that drew heavily on Native American plant knowledge and emphasized milder botanical treatments. The eclectics had their own medical schools, their own pharmacopeia, and their own journals.

You could see a homeopath, working from a different theoretical framework that we now know to be wrong but whose practitioners, by virtue of giving you essentially nothing, killed substantially fewer patients than the allopaths did. You could see a Thomsonian, working from a populist tradition that held that ordinary people should be able to treat themselves with simple plant remedies. You could see an osteopath, a chiropractor, a hydropath. You could see a midwife who had delivered three hundred babies and lost fewer mothers than the obstetric ward of the nearest hospital. You could see a curandera, a root doctor, a granny woman, a Chinese herbalist, a folk practitioner from whatever tradition your community carried.

Some of this was excellent medicine. Some of it was useless. Some of it was actively harmful. The overall landscape was, to put it mildly, uneven.

It was also full of fraud. The late nineteenth century was the golden age of American patent medicine: vast, almost entirely unregulated, and frequently lethal. Bottles of brightly colored liquid were sold by traveling salesmen with claims that ranged from optimistic to homicidal. Many contained alcohol, opium, cocaine, mercury, or some combination. Children were dosed with morphine to stop them crying. Tonics for "women's complaints" were forty proof. The Pure Food and Drug Act of 1906 came to be because thousands of Americans were dying from products sold to them as medicine.

(The phrase "snake oil," now synonymous with fraud, is itself a small artifact of the erasure. The original product, brought to America by Chinese railroad workers, was oil from the Chinese water snake, high in omega-3s, used for joint pain. It worked. What killed its reputation was a Pennsylvanian named Clark Stanley, whose 1890s "Snake Oil Liniment" contained no snake at all. The fraud took the name. The medicine got the reputation.)

This is the situation Abraham Flexner walked into. Flexner was not a physician. He was an educator, hired by the Carnegie Foundation in 1908 to survey the state of American medical education. He visited every medical school in the United States and Canada, all 155 of them, and in 1910 he published his report.

The report was devastating, and largely accurate. American medical education was a disaster. Most schools were proprietary, meaning they were owned by the doctors who taught at them and existed primarily to generate income. Admissions standards were nonexistent. Curricula varied wildly. Some schools had no laboratories, no cadavers, no hospital affiliations. Students paid their fees and received their diplomas with minimal evidence of having learned medicine. Diploma mills were real. Flexner named them. He recommended that most of the schools he visited be closed.

He was trying to solve a real problem. People were dying because the man with the medical license had purchased it rather than earned it. The reform was needed.

What Flexner also recommended was that American medical education be remade in the image of Johns Hopkins, which had been founded in 1893 on the German research university model. Heavy emphasis on basic science, laboratory training, full-time clinical faculty, university affiliation, four-year curriculum following two years of college. This was the gold standard. It was also enormously expensive to provide and to attend.

Carnegie and Rockefeller money flowed to the schools that could meet the new standard. The schools that could not meet it closed. By 1935, the number of American medical schools had been cut roughly in half. The schools that closed were disproportionately those training women, Black, and immigrant students. Of the seven Black medical schools operating in 1910, five closed within a decade. The schools serving women fared similarly. The eclectic medical schools, which had taught the botanical tradition with serious scientific rigor for sixty years, closed without exception. The Thomsonian schools were already gone. The homeopathic schools mostly converted to allopathic curricula or shut down. By 1940, American medicine was monolithic in a way it had not been at any prior point in history.

The AMA, which had been one voice among many in 1900, was now the voice. State licensing laws, which had been weak or nonexistent in many states, were rewritten to require graduation from an AMA-approved medical school. The practitioners who had served their communities outside this system were now, in many cases, criminals. Midwives who had delivered babies for thirty years could be arrested for practicing medicine without a license. Herbalists who had treated their neighbors for generations had to either stop or hide. The traditions did not vanish. They went underground, into immigrant kitchens, into Appalachian hollers, into reservations, into the practices of a dwindling number of practitioners who taught their apprentices in private and did not advertise.

This was not a conspiracy in the usual sense. There was no secret room. But it was not disinterested either: the reform was coordinated with the American Medical Association, which had its own stake in a smaller, more elite, more lucrative profession, and the schools that closed were exactly the ones a self-interested guild would want closed. None of which changes that Flexner and Carnegie were also solving a real problem, and did solve it. American medical education became, within a generation, the best in the world. The standardization of training saved an enormous number of lives. Modern surgery, modern pharmacology, modern public health, the eradication of smallpox, the elimination of childbed fever, the routine survival of premature infants who would have died in any prior century, all of this is downstream of the reform.

The reform also, in solving the problem of fraud and incompetence, swept away a great deal that was neither fraudulent nor incompetent. The eclectic tradition contained genuine empirical knowledge: decades of clinical observation layered on top of plant-medicine traditions refined over centuries. The midwifery tradition had outcomes data that, in many measures, matched or exceeded the obstetric outcomes of the era. The herbal pharmacopeia contained substances whose mechanisms we are still, in 2026, working out. None of this fit the new model. So it was not taught. And what is not taught in one generation is forgotten in the next.

That is the story. A reform that solved a real problem and, in solving it, did damage that nobody quite intended and few people in power noticed. The pluralistic medical landscape of 1900 became the consolidated profession of 1940, and by the time anyone thought to ask whether something had been lost, the people who could have answered the question were dead.

Step back and look at what happened.

A medical pluralism existed. Some of it was valuable, some of it was junk, much was in between. A reform was undertaken to address real problems in the system. It succeeded in its narrow aims, and in succeeding, it accomplished two things that were not its stated purpose but were structurally required to make it work.

First, it pathologized direct experience. The midwife's thirty years of catching babies stopped counting as expertise. The herbalist's lifetime of working with plants stopped counting as knowledge. Only the credentialed observer working in the approved setting under the approved methodology could now generate facts about the body.

Second, it elevated credentialed intermediaries to a position of monopoly. The right to know things about your body, and to act on that knowledge, was transferred from a wide population of practitioners with varying training to a narrow profession with standardized training. This was, in many ways, an improvement. But it was also a transfer of power.

Now look at where that consolidation has left us.

The replication crisis has revealed that a substantial fraction of published biomedical research does not replicate. The opioid epidemic has revealed that the same regulatory and prescribing apparatus we trusted to gatekeep medicine was capable, when sufficiently captured by industry, of killing several hundred thousand Americans and continuing to do so for over a decade after the problem was widely understood. The relationship between the FDA and the industries it regulates has become, by the admission of former FDA officials, structurally compromised. The number of Americans who report that they trust the medical establishment has fallen to historic lows, and while some of this is attributable to bad-faith political actors, the rest of it is the predictable consequence of a profession that consolidated enormous power and, in some prominent instances, used it badly.

You do not have to be anti-pharmaceutical to notice this. Pharmaceutical medicine is one of the great achievements of the human species. The point is narrower. The consolidation that produced modern medicine also produced certain failure modes that are now visible, and a reasonable person might wonder whether the pendulum swung further than was strictly necessary. Whether some of what was lost was worth losing. Whether the wholesale transfer of medical authority from a pluralistic landscape to a single profession, however justified by the problems of 1900, has produced its own problems by 2026 that we are only now beginning to assess.

None of this is an attack on doctors. I have a doctor. I like my doctor. The next time I need surgery I will not be seeking out a curandera. The argument is that a reasonable person, having understood how the consolidation actually happened, might hold a more nuanced position than the one she was handed. She might be curious about what the eclectic tradition actually knew. She might wonder what is in the hibiscus that lowered blood pressure as effectively as lisinopril. She might find herself less certain that everything outside the corner pharmacy is woo, and less certain that everything inside it is sound.

She might also notice that the pattern is not unique to herbalism.

There was another body of knowledge, older than the eclectic tradition, that worked with a different class of substances. The substances acted on consciousness rather than on blood pressure or digestion, and the practitioners who used them had studied their effects somewhere between five thousand and ten thousand years, depending on which lineage you consult. The tradition had its own pharmacopeia, its own training methods, its own pedigree of careful empirical observation. Like the herbal one, it contained a great deal that was valuable and some that was junk.

It met its Flexner Report in the 1960s and '70s. The reform had its own real problems to point to (real harms, real fraud, real abuses), and it succeeded in its narrow aims. The substances were criminalized. The research programs at Harvard and Spring Grove were shut down. The practitioners scattered. And in succeeding, the reform accomplished the same two structural things. It pathologized direct experience. It elevated credentialed intermediaries. It swept away the careful alongside the fraudulent. By the time anyone in mainstream medicine thought to ask what had been lost, the people who could have answered were dead, in hiding, or had spent thirty years being told their entire field of expertise was a delusion.

Same shape. Same mechanism. Same mistake.

The substances, of course, were psilocybin, ayahuasca, peyote, and their cousins. We are now, sixty years later, slowly and expensively rediscovering what those practitioners knew. The rediscovery is being conducted by credentialed intermediaries in approved settings under approved methodologies, because that is the only way knowledge is allowed to count anymore. Some of what they will find will be new. A great deal of it will be a confirmation of what was known before the reform, by people the reform decided did not count.

This is not an argument that the herbalists were right about everything. They were not. It is not an argument that the curanderas should be running clinical trials, or against medical licensing or the FDA or any of the institutions that have, on net, made human life better.

It is an argument about a pattern. The pattern is that when a culture consolidates the right to know things into a single credentialed profession, it loses access to forms of knowledge that do not fit the credentialing structure, and it loses them in ways that are hard to recover from, because the people who held the knowledge are dispersed and discredited and, eventually, dead.

The herbalists are still here. Most of them are not what you imagine. The serious ones I know are well-trained, deeply informed by science, and more than a little weary of a wellness-industrial complex that has turned a five-thousand-year tradition into a $5.99 mushroom gummy. They are practicing in a tradition that has survived two waves of reform-driven near-extinction and is still, mostly, operating below the radar of a profession that does not quite know what to do with them.

You do not have to drink the tea. You should know why you were never offered it in the first place.

References and Further Reading

Herrera-Arellano, Armando, Jesús Miranda-Sánchez, Patricia Ávila-Castro, et al. 2007. "Clinical Effects Produced by a Standardized Herbal Medicinal Product of Hibiscus sabdariffa on Patients with Hypertension. A Randomized, Double-Blind, Lisinopril-Controlled Clinical Trial." Planta Medica 73 (1): 6–12.
The head-to-head trial in the opening. The standardized hibiscus extract reached ~65% therapeutic effectiveness against lisinopril's ~82%, with full tolerability.

Linde, Klaus, Michael M. Berner, and Levente Kriston. 2008. "St John's Wort for Major Depression." Cochrane Database of Systematic Reviews, no. 4: CD000448.
Review of 29 trials in 5,489 patients. St. John's wort beat placebo and matched standard antidepressants for mild-to-moderate depression, with fewer adverse effects; the benefit for severe major depression was more equivocal.

Ryan, Julie L., Charles E. Heckler, Joseph A. Roscoe, et al. 2012. "Ginger (Zingiber Officinale) Reduces Acute Chemotherapy-Induced Nausea: A URCC CCOP Study of 576 Patients." Supportive Care in Cancer 20 (7): 1479–89. 
Multicenter, double-blind RCT. Ginger at 0.5–1.0 g/day, added to standard antiemetics, significantly reduced the severity of acute chemotherapy-induced nausea.

Lacy, Brian E., Mark Pimentel, Darren M. Brenner, et al. 2021. "ACG Clinical Guideline: Management of Irritable Bowel Syndrome." American Journal of Gastroenterology 116 (1): 17–44.
The current American College of Gastroenterology guideline, which recommends peppermint oil for overall IBS symptom relief (a conditional recommendation on low-quality evidence).

Flexner, Abraham. 1910. Medical Education in the United States and Canada: A Report to the Carnegie Foundation for the Advancement of Teaching. Bulletin No. 4. New York: Carnegie Foundation for the Advancement of Teaching.
The primary document. Source of the recommendation to close most existing schools, and of the assessment that, of the seven Black medical schools, five were "in no position to make any contribution of value."

Campbell, Kendall M., Irma Corral, Jhojana L. Infante Linares, and Dmitry Tumin. 2020. "Projected Estimates of African American Medical Graduates of Closed Historically Black Medical Schools." JAMA Network Open 3 (8): e2015220.
An economic evaluation estimating that the five closed Black medical schools might have trained roughly 35,000 additional physicians by 2019. The downstream cost of the consolidation, quantified.

Starr, Paul. 1982. The Social Transformation of American Medicine. New York: Basic Books.
The definitive history of how American medicine consolidated its authority into a sovereign profession. The structural argument of this essay rests on Starr's account.

Essays on treatment resistance, altered states, and the conditions under which change becomes possible.

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