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Picture this: you're standing in the tea aisle holding a box of chamomile, and the label says it has “been used for centuries to support relaxation.” A friend mentions she read that a small human study found chamomile extract helped with mild anxiety symptoms. Both of those things can be true at the same time, and they are not the same kind of evidence. One is a record of how people have used a plant across generations. The other is a measurement of what happened when researchers tracked a specific group of people under specific conditions.

This guide walks through why “people have used this for a long time” and “a study measured this in humans” are two separate questions, what each one can and cannot tell you, and how to think through the difference before you make a decision about an herb or supplement.

Red Flag First: This Is Not Medical Advice

Nothing in this article is a recommendation to start, stop, or change any medicine or supplement, and it is not a diagnosis of any condition. If you are having a medical emergency, call your local emergency number right away. If you are managing a health condition or taking prescription medication, talk with a doctor or pharmacist before adding an herb or supplement, since some botanicals can interact with medicines.

Stage One: What “Traditional Use” Actually Means

Traditional use means a plant, food, or preparation has been used by a community over a long stretch of time, often generations, usually passed down through observation and practice rather than written experiments. It tells you that a plant has a documented history of use for a certain purpose, and often that it has been tolerated well enough by enough people that the practice continued.

What it does not tell you is the dose that was actually used, how consistently the plant was prepared, whether the people using it also had other health conditions or were taking other substances, or whether the outcome people noticed was caused by the plant itself versus other factors in their lives. Long-standing use is a real form of human experience. It is just not a controlled measurement.

Stage Two: What Human Research Is Trying to Measure

Human clinical research tries to isolate one variable at a time. Researchers define a specific dose, a specific preparation, a specific group of participants, and a specific outcome they are measuring, then compare what happens in people who received the substance against people who did not. The goal is to reduce the number of other explanations for what they observe.

The National Center for Complementary and Integrative Health (NCCIH), part of the National Institutes of Health, publishes a series of fact sheets called “Herbs at a Glance” that summarize, herb by herb, what the current science says, along with potential side effects and cautions. The existence of a research summary for a given herb does not automatically mean the traditional use and the studied use match. A study might have tested a concentrated extract at a measured dose, while traditional preparations are often a tea, tincture, or whole-plant form taken in variable amounts. Those are different things being tested, even when they involve the same plant.

Stage Three: Why the Two Don't Automatically Line Up

A few reasons these two categories of evidence commonly diverge:

• Dose and preparation differ. Traditional use often involves teas, whole herbs, or home preparations, while a study may test a standardized extract at a fixed concentration.
• The outcome measured may be narrower. A traditional use might be described broadly, such as “for calm,” while a study measures one specific, defined outcome over a set number of weeks.
• Sample size and setting matter. Generations of use across many communities is a different kind of record than a study involving a specific, often smaller, group of volunteers.
• Absence of a study is not evidence of harm or benefit. A plant with a long history of use may simply not have been studied yet in a formal human trial, which is different from having been studied and found ineffective.

Stage Four: Where Supplement Labels Fit Into This

In the United States, dietary supplements are regulated differently than drugs. According to the U.S. Food and Drug Administration (FDA), manufacturers and distributors are responsible for evaluating the safety and labeling of their own products before they go to market, and supplements are regulated under a different framework than conventional foods or drugs. The FDA's authority largely comes into play after a product reaches the market, meaning it can act against a product found to be adulterated or misbranded once it is already for sale.

That structure matters for this topic because a label citing “traditional use” is describing a history, not presenting the result of a premarket clinical trial the way a prescription drug label does. Reading a supplement label with that distinction in mind is its own skill, and our guide on how to read supplement labels goes through it in more detail.

A Simple Decision Path

When you come across a claim about an herb, this sequence of questions can help sort what kind of evidence you're actually looking at:

1. Is this describing history or a measurement? Words like “traditionally used for” describe a history of use. Words like “a study found” or “researchers observed” describe a measurement.
2. If it's a measurement, was it in humans? Laboratory (test tube) and animal studies can point researchers toward a question worth studying further, but they do not show what happens in a person.
3. Does the form match? Check whether the study used the same preparation and dose as the product in front of you, such as a standardized extract versus a loose-leaf tea.
4. What did NCCIH's summary say, if one exists? The relevant “Herbs at a Glance” fact sheet, when available for that herb, is a useful next stop for a plain-language summary of current science and known cautions.
5. Does it involve a medication you take? If you take any prescription or over-the-counter medicine, this is the point to bring the specific herb and product to a pharmacist or doctor, since interactions are a real possibility NCCIH highlights for many botanicals.

What This Guide Is Not Saying

This is not an argument that traditional use is meaningless, or that only clinical trials count as valid evidence. It is a reminder that they are answering different questions, and that a well-informed reader benefits from knowing which question is being answered before drawing a conclusion. It's also worth remembering the reverse point above: an herb without a human clinical trial to its name has not necessarily been “disproven.” It may simply be understudied.

For background on how botanical names and preparation types are labeled and why that terminology matters when comparing traditional use to research, see our related piece on herbal tea labels, botanical names, and plant parts.

Sources and Further Reading

• NCCIH: Herbs at a Glance — fact sheets on individual herbs covering what current science says, along with side effects and cautions.
• U.S. Food and Drug Administration: Dietary Supplements — background on how dietary supplements are regulated in the United States.

Editorial Note

By MountainSageNaturalHealth.com Editorial Team. This article is for general educational purposes only. It is not medical advice, and it does not diagnose, treat, or recommend treatment for any condition. Always talk with a qualified healthcare provider before starting, stopping, or changing any herb, supplement, or medication. Mountain Sage Natural Health is an independent publication and is not affiliated with NCCIH, NIH, or the FDA.

Last updated: September 17, 2026.