By Curro Cachinero, founder of Adaptonics · Based on more than 12 years of growing and processing our own plants on Tenerife · Last updated: August 2026

Cistus, the rock rose, is an undemanding Mediterranean shrub – and at the same time one of the best-researched plants in our range. Unlike some other natural substances, the evidence here extends beyond laboratory experiments to real, placebo-controlled human studies. That is precisely why rock rose deserves its own careful overview.

As early as antiquity, the resin was used to produce the incense labdanum; in Greece, Cistus is still part of traditional medicine today. This tradition is one reason to take a closer look – but the truly interesting part begins with modern research, which since the 2000s has included studies on Cistus incanus at the University of Regensburg, among other institutions.

The short answer first: The polyphenols in rock rose were active against several viruses (influenza, HIV, Ebola, Marburg, SARS-CoV-2) in cell-culture and animal studies. Two placebo-controlled human studies involving a total of 460 patients also show a measurable effect on cold symptoms in the upper respiratory tract. This is an unusually solid starting point for a natural substance – but it does not mean that Cistus has been proven to prevent or cure any particular viral disease in humans.

Contents

• What is Cistus?
• How I discovered rockrose in Tenerife
• What compounds are found in rockrose?
• What does the research show—from cell culture to human studies?
• Cistus during the pandemic: the Imun-Guard story
• Wild plant instead of cultivated plant
• My experience
• Frequently asked questions
• Sources

What is Cistus?

Rock rose (Cistus, in English “rock rose”) is a low-growing, woody shrub from the Mediterranean region that grows in barren, often volcanic soil – terrain where many other plants barely survive. Its seeds even germinate reliably only after wildfires, an adaptation to its habitat. In early summer, it produces large, paper-thin white or pink flowers; its leaves are resinous, intensely fragrant, and contain bitter compounds, tannins, and essential oils.

Our rock rose grows wild between pine forest and volcanic scree – learn more about this habitat and its resilience in Rock Rose (Cistus): What Makes Wild Plants So Special?

The Canary Island rock rose: a distinct, barely researched species

Important context: The rock rose used in the studies above is Cistus incanus – the Greek or Mediterranean rock rose. What grows wild here on Tenerife is a different, distinct species: Cistus symphytifolius, the mallow-leaved or Canary Island rock rose, endemic to the Canary Islands.

The Canary Islands are considered the “Galápagos Islands of botany” because of their isolated valleys and distinct microclimatic conditions—a description that also applies to Cistus. Over time, practically every valley has produced its own subspecies or closely related form; on Tenerife, for example, there is also the closely related Chinamada rockrose (Cistus chinamadensis), which occurs only in a small area of the Anaga Mountains.

However, this also means that the research described at the beginning—the human studies and in-vitro work on SARS-CoV-2, HIV, herpes, and similar viruses—explicitly concerns Cistus incanus, not our Canary species. Cistus symphytifolius remains largely unexplored scientifically; we have no reliable studies on its constituents or effects. In traditional Canary Island medicine, there are mainly indications of its use for gum problems—a much narrower tradition than the Greek one.

My own experience and feedback from customers and friends suggest that the Canary rockrose is at least as effective as the Greek species—but this is expressly a personal assessment, not a scientific finding, and must be clearly distinguished from the research on Cistus incanus described above.

How I discovered rockrose in Tenerife

I came across rockrose because I had heard that the natural cosmetics and pharmaceutical company WALA was researching it. So I collected some myself and prepared a tincture. I was immediately fascinated—not only by its scent and flowers, but by a feeling I could not scientifically explain: This plant has power.

For now, this is a personal observation, not proof. But it was precisely what prompted me to look at the actual research—and, as you will read shortly, it is surprisingly extensive.

Read the more detailed story in Rockrose—the wonder plant: Cistus from Tenerife.

What compounds are found in rockrose?

The most extensively studied component is polyphenols—more precisely, highly polymerized polyphenols, which occur in high concentrations specifically in certain Cistus incanus chemotypes. The rockrose produces these secondary plant compounds to protect itself from UV radiation, herbivores, fungi, and viruses. They are considered powerful antioxidants and are the starting point for practically all modern research on Cistus—more on this in the next section.

What does the research show—from cell culture to human studies?

With Cistus, it is particularly useful to organize the evidence by level—from laboratory observations to clinical studies in humans. You can find a complete study table organized by area, with 30 linked publications and regulatory sources, in our detailed research overview of Cistus/rockrose. You can also find the complete collection of studies organized by topic (antiviral, antibacterial/antifungal, antioxidant/cell protection, as well as individual studies on inflammatory processes, Lyme disease, and cancer research) in Cistus: What scientific studies are available?—here are the most important findings, put into context:

1. In-vitro research (cell culture)

A study published in 2016 in Scientific Reports (part of the Nature publishing group) investigated Cistus incanus extract against HIV-1, HIV-2, and virus particles bearing the envelope proteins of Ebola and Marburg viruses. In the cell model, inhibition of infection was observed, presumably because components of the extract hindered the attachment of the virus particles to the host cell.^[1]

As early as 2007, a research group had shown that the standardized extract CYSTUS052 inhibits the replication of influenza A viruses (H7N7) both in cell culture and in a mouse model, without toxic side effects or the development of resistance.^[2]

This line of research continued during the coronavirus pandemic: In 2021, the Fraunhofer Institute for Cell Therapy and Immunology in Leipzig demonstrated in-vitro inhibition of SARS-CoV-2 by a Cistus incanus extract^[3], later studies also confirmed this for the Alpha, Beta, and Delta variants.^[4]

And research has continued since then. In 2025, a Bulgarian research group showed that a Cistus incanus extract significantly inhibited both the replication and infectivity of free virus particles in two herpes simplex strains and a common-cold coronavirus (HCoV-229E)—remarkably, also in a herpes strain resistant to the standard drug acyclovir. In 2024, an Italian research group was the first to specifically test individual components of the extract directly against authentic SARS-CoV-2 (not just a surrogate coronavirus): Punicalin showed a significant antiviral effect when cells and virus were pretreated.^[7][8] Also entirely new in 2026 is a purely computer-based modeling study on potential targets of Cistus compounds in the Ebola virus protein VP40^[9]—this is explicitly a computer simulation only, without any cell or animal experiments, and therefore represents the most preliminary level of evidence conceivable.

The evidence base is broad outside the viral field as well: individual studies have examined antibacterial and antifungal effects (including against Candida), the contribution of polyphenols to protection against free radicals and oxidative cellular stress, and—much more tentatively—effects related to Lyme disease and cancer research.

The important point is that all of this involves cell cultures, animal models, or even just computer simulations—not humans. A mechanism that works in the laboratory or on a computer is a good reason for further research, but it is not yet proof of efficacy in humans.

2. Clinical studies in humans

This is unusually concrete for a natural substance: a prospective, randomized, placebo-controlled study from 2009 examined the CYSTUS052 extract in 160 patients with upper respiratory tract infections. Symptoms decreased more strongly with the extract than with placebo, and differences were also observed in the inflammatory markers examined.^[5] A follow-up study compared the same extract with green tea in 300 patients—here too, subjective symptoms decreased more strongly in the Cistus group.^[6] We are not aware of any newer placebo-controlled human studies on Cistus—these two papers from 2009/2010 remain the only clinical evidence to date.

These are real clinical data, not merely laboratory findings—a rare level of evidence for a plant extract. However, they concern a specific preparation (CYSTUS052) and upper respiratory tract infections in general, not a specific virus or disease.

For more on the collection of studies as a whole, see Rockrose in the spotlight of science and Rockrose and the immune system: What does the research say? For the question of whether Cistus also has anti-inflammatory effects and what this has to do with our immune system, see Does rockrose have anti-inflammatory effects?

Cistus during the pandemic: the Imun-Guard story

In March 2020, in the middle of the first lockdown, we produced around 1,000 liters of our Cistus combination tincture Imun Guard from scratch—at a significantly lower price than our other products because, at that moment, our focus was not on business. I tell the full backstory—including an honest retrospective assessment of what seemed plausible at the time and what was later actually confirmed—in Rockrose and the immune system: The story behind Cistus+ or Imun Guard. Two further snapshots from that period: Rockrose during the pandemic and Don't be afraid of viruses or vaccines, as well as the multi-part essay: Strengthening the immune system naturally. 

Wild plant instead of cultivated plant

One thought about Cistus that I cannot shake: wild plants that have to survive in barren environments against UV radiation, fungi, and herbivores often produce more secondary plant compounds for this purpose than cultivated plants. Whether and how this translates to humans is an open but plausible question—find out more in Rockrose (Cistus): What makes wild plants so special? The cosmetic, topical tradition of rockrose also belongs in this picture—see Rockrose: True beauty comes from within.

My experience

I have personally used Cistus extract for many years, especially at the first signs of a cold. This is personal experience, not clinical evidence—but it aligns with the basic idea of the two human studies above: a noticeable effect on cold symptoms in the upper respiratory tract. I explain why we at Adaptonics would generally prefer to invest in our own research rather than rely solely on anecdotal reports in Naturopathy and research: Why we want to study rockrose more closely.

Frequently asked questions about Cistus

Is Cistus the same as rockrose?

Yes, Cistus is the botanical genus name, while rockrose is the English name.

Does Cistus protect against viruses?

Antiviral effects against several viruses have been demonstrated in cell cultures and animal models—including, by now, against actual SARS-CoV-2 and an acyclovir-resistant herpes strain. Two placebo-controlled human studies show an effect on cold symptoms. This does not prove protection against any particular virus in humans.

Tea or tincture?

Both have traditionally been used. A water-based extract (tea) is milder, while an alcoholic extract is more concentrated and has a longer shelf life. There are no dedicated studies directly comparing the effects of the two preparation forms.

Is Cistus a medication?

No. Cistus products are offered as food supplements and are not intended to diagnose, treat, or cure diseases.

Sources

1. Rebensburg S, et al. Potent in vitro antiviral activity of Cistus incanus extract against HIV and Filoviruses targets viral envelope proteins. Scientific Reports. 2016;6:20394. DOI: 10.1038/srep20394
2. Ehrhardt C, et al. A polyphenol rich plant extract, CYSTUS052, exerts anti influenza virus activity in cell culture without toxic side effects. Antiviral Research. 2007;76:38–47.
3. Fraunhofer IZI Leipzig / Thieme. Antiviral properties of the extract from Cistus × incanus L. Pandalis also demonstrated against SARS-CoV-2 in vitro. 2021.
4. Traeder JM. Cistus × Incanus L. Pandalis Is Highly Effective Against Delta Variant of SARS-CoV-2 in Vitro. Journal of Diseases and Medicinal Plants. 2021;7(3):82–86.
5. Kalus U, et al. Cistus incanus (CYSTUS052) for treating patients with infection of the upper respiratory tract: a prospective, randomised, placebo-controlled clinical study. Antiviral Research. 2009;84(3):267–271.
6. Kalus U, Kiesewetter H, Radtke H. Effect of CYSTUS052 and green tea on subjective symptoms in patients with infection of the upper respiratory tract. Phytotherapy Research. 2010;24(1):96–100.
7. Angelova P, et al. Antiviral Activity of Water–Alcoholic Extract of Cistus incanus L. International Journal of Molecular Sciences. 2025;26(3):947. DOI: 10.3390/ijms26030947
8. De Filippis A, et al. Cistus incanus: a natural source of antimicrobial metabolites. Natural Product Research. 2025;39(12):3396–3409. DOI: 10.1080/14786419.2024.2335353
9. Computer-assisted docking/molecular dynamics study of compounds from Cistus incanus against the Ebola virus protein VP40. Biophysica. 2026. DOI: 10.3390/biophysica6020029 – purely in-silico modeling, with no laboratory or animal data.
10. More than 20 additional individual studies on antibacterial, antifungal, and antioxidant effects, as well as Lyme disease and cancer research, are compiled in Cistus: What scientific studies are available?

You can find a complete, linked study table with 30 publications and regulatory sources in our research overview of Cistus/rockrose.

Note: This post is for general information only and is not a substitute for medical advice.