When the Herb Isn't the Herb: Adulteration and What It Means for Therapeutic Outcomes

When a client asks whether an herbal formula will work, the first question is not about the dose. It is about the ingredient itself.

Not the name on the spec sheet. The actual material.

In botanical medicine, the gap between what a raw material is labelled and what it actually contains can be significant, and that gap has real consequences for anyone depending on that formula to do something meaningful for their health.

This month the lab team at CPC is publishing findings on adulteration trends in raw botanicals. This piece approaches the same problem from a different angle: what happens when the botanical in a formula is not actually what it claims to be.

The Identification Problem

Botanical adulteration is not always deliberate fraud. Sometimes it starts with a simple misidentification at the source. Plants that look nearly identical once they are dried and ground get harvested and processed by suppliers who may not have the tools to tell them apart.

Echinacea is one of the most well-documented examples. The genus includes several species, among them Echinacea purpurea, Echinacea angustifolia, and Echinacea pallida. These are not interchangeable. Each species has a different mix of naturally occurring compounds, and the research supporting Echinacea's role in immune health is specific to particular species and particular parts of the plant. A product labelled simply as Echinacea that contains the wrong species, or an undisclosed blend of species in unknown proportions, is not backed by the same evidence its label implies (1, 2).

Species substitution and undisclosed blending are among the most commonly identified problems in commercial Echinacea products. This is not rare. It shows up across products at every price point.

Different Parts, Different Results

Even when the species is correctly identified, the part of the plant used matters.

Think of it this way: garlic cloves and garlic leaves come from the same plant, but they are not the same ingredient. The same logic applies to medicinal botanicals.

In Echinacea purpurea and Echinacea angustifolia, the root and the above-ground parts of the plant carry different concentrations of the compounds associated with immune support. A product built from aerial parts will not behave the same way as one built from the root, even if both are correctly labelled by species (3).

When suppliers blend plant parts without disclosing it, or when purchasing decisions are made on price rather than on what part of the plant was actually used, a formulator loses control of what is in the product before manufacturing even begins.

What You Extract Depends on How You Extract It

This is where a simple comparison helps.

Steeping dried Echinacea purpurea flowers in hot water makes a tea. That tea will contain compounds that dissolve in water. It will not contain the compounds concentrated in the root, because those do not dissolve in water at all. To get those out, you need alcohol, and you need the right part of the plant to start with.

This is the basic logic behind solvent selection in botanical extraction, and it is not a minor detail. It determines what ends up in the finished product.

The clinical studies on Echinacea are not interchangeable across different extraction methods. Research done on an alcohol-based root extract does not automatically apply to a water-based flower extract, even if both products use the Echinacea name on the label (3, 4). When a supplier's documentation does not specify how the extract was made, or when a manufacturer changes the method without adjusting the formula, the product quietly moves away from the evidence it was built on.

Storage and Transit: Where Quality Can Quietly Disappear

Raw botanical quality does not end at harvest. It continues through every step of the journey from farm to facility.

Heat, moisture, light exposure, and time all affect the stability of the active compounds in a botanical ingredient. Certain compounds in Echinacea are sensitive to oxidation, meaning exposure to air and poor storage conditions can break them down before the material ever reaches a manufacturing floor (4).

A certificate of analysis generated at the supplier's facility on the day of shipment does not tell you what arrives weeks or months later after moving through multiple hands and storage conditions. The numbers on that document reflect the material at one point in time and one location. They do not follow the material through the supply chain.

This is why incoming verification at the manufacturing facility is not a formality. It is the point where everything the supply chain got wrong either gets caught or gets built into the finished product.

What This Means in Practice

Species, plant part, and extraction method determine whether the clinical evidence behind a botanical ingredient actually applies to the product being manufactured. Storage and transit determine whether that ingredient arrives in the condition the evidence assumes.

These are not abstract concerns. They are the variables that sit between what botanical science shows is possible and what a person actually receives when they take a product.

The evidence base for botanical medicine is real and it is growing. Getting it to the person who needs it intact is a question of whether every decision made between the farm and the finished capsule was the right one.

These are not abstract concerns. They are the variables that sit between what botanical science shows is possible and what a person actually receives when they take a product.

The evidence base for botanical medicine is real and it is growing. Getting it to the person who needs it intact depends on every decision made between the farm and the finished capsule.

That is why incoming raw material verification matters. Purity testing, assay, and chemical identification confirm the material is what it claims to be and that active compounds are present at the required concentration. A certificate of analysis and certificate of origin from the supplier are the starting point — not the conclusion. They tell you what the material was at one point in time, in one location. What happens after that is where manufacturing standards either hold or they do not.

References

1. Manayi, A., Vazirian, M., and Saeidnia, S. (2015). Echinacea purpurea: Pharmacology, phytochemistry and analysis methods. Pharmacognosy Reviews, 9(17), 63-72. https://doi.org/10.4103/0973-7847.156353

2. Gilroy, C. M., Steele, J. F., Byers, J., Pencil, M., Love, J., Rashid, M., Cogbill, T., and Gould, J. L. (2003). Echinacea and truth in labeling. Archives of Internal Medicine, 163(6), 699-704. https://doi.org/10.1001/archinte.163.6.699

3. Barnes, J., Anderson, L. A., and Phillipson, J. D. (2005). Herbal Medicines (3rd ed.). Pharmaceutical Press.

4. Bauer, R. (1999). Echinacea: Biological effects and active principles. In L. D. Lawson and R. Bauer (Eds.), Phytomedicines of Europe: Chemistry and Biological Activity (pp. 140-157). American Chemical Society. https://doi.org/10.1021/bk-1998-0691.ch012