Polypodium (generic name)

treats Psoriasis, Dementia, Atopic dermatitis, Vitiligo, and Skin damage caused by the sun
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Ferns, Anapsos


Herbs & Supplements


Calagula, calagualine, ferns, Polypodiaceae (family), Polypodium cambricum, Polypodium decumanum, Polypodium vulgare, samambaia.


Extracts of fern species (family Polypodiaceae) have been used traditionally for numerous indications, most commonly in South America and Europe.

The South American species Polypodium leucotomos L. is commonly known as "calaguala." Extracts of this species, called "anapsos," have been marketed and used as a treatment for multiple indications. Although laboratory and animal studies have reported anti-inflammatory, cytokine-suppressing, and leukotriene inhibitory properties, the small number of available human trials have not demonstrated efficacy for any specific indication.


DISCLAIMER: These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider.

Atopic dermatitis (eczema): Laboratory and animal studies report that Polypodium leucotomos extract (anapsos) may reduce inflammation. However, there is little information about the effectiveness of anapsos taken by mouth in people with atopic dermatitis.
Grade: C

Dementia (memory loss, disorientation), Alzheimer's disease: Limited scientific information is available about the effectiveness of polypodium in the treatment of dementia.
Grade: C

Psoriasis: Extracts of Polypodium leucotomos (called "anapsos") have been taken by mouth in Europe and South America for psoriasis since the 1970s. Poor-quality human studies report that anapsos may improve skin appearance. However, there is currently little information supporting the use of Polypodium leucotomos for psoriasis. More research is needed in this area before a recommendation can be made.
Grade: C

Skin damage caused by the sun: Early study shows that polypodium may help to prevent sunburn, skin aging, and skin cancers resulting from uncontrolled overexposure of human skin to solar UV radiation (UVA and UVB). Further research is needed to confirm these results.
Grade: C

Vitiligo (loss of pigment in the skin): A combination of polypodium and narrow-band UVB (NB-UVB) light therapy may help treat vitiligo, especially on the head and neck. Additional research is needed in this area.
Grade: C


WARNING: DISCLAIMER: The below uses are based on tradition, scientific theories, or limited research. They often have not been thoroughly tested in humans, and safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. There may be other proposed uses that are not listed below.
Antioxidant, arthritis, asthma, autoimmune diseases, cancer, diuretic, fever, high blood pressure, immune system stimulation, inflammation, neurodegenerative disorders, pertussis, rheumatism or joint diseases, tissue repair after brain damage, upper respiratory tract infection, vaccination in animals for Fasciola hepatica, water retention, whooping cough.


Adults (18 years and older)

For psoriasis, a dose of 120 milligrams of anapsos (Polypodium leucotomos extract), taken daily by mouth, has been used for short periods of time in limited research. For UV radiation, 7.5 milligrams per kilogram has been studied. For dementia, preliminary research reports using 360 milligrams daily for four weeks. Safety and effectiveness are not clear.

No clear topical (on the skin) dosing regimen has been reported or established.

For vitiligo, 250 milligrams of Polypodium leucotomos has been taken three times daily in combination with narrow-band UVB (NB-UVB) twice weekly for 25-26 weeks.

Children (younger than 18 years)

Little information is available about the use of polypodium in children and safety is not clear.


DISCLAIMER: Many complementary techniques are practiced by healthcare professionals with formal training, in accordance with the standards of national organizations. However, this is not universally the case, and adverse effects are possible. Due to limited research, in some cases only limited safety information is available.


People with allergies to ferns (family Polypodiaceae) should avoid polypodium.

Side Effects and Warnings

Isolated reports of itching or stomach upset are published. Studies of a different fern species, Polypodium vulgare, report sedation, changes in heart function in animals, low blood pressure, and rapid heart rate. Avoid driving and use of heavy machinery when taking Polypodium leucotomos extract due to theoretical sedative effects. People with heart disease or those being treated for heart disorders or high blood pressure should use caution.

Pregnancy and Breastfeeding

The use of polypodium during pregnancy or breastfeeding is not recommended because there is little information about its safety.


Interactions with Drugs

Polypodium may increase the amount of drowsiness caused by some drugs. Examples include benzodiazepines such as lorazepam (Ativan®) or diazepam (Valium®), barbiturates such as phenobarbital, narcotics such as codeine, some antidepressants, and alcohol. Caution is advised while driving or operating machinery.

Most testing has been done with a related fern species, Polypodium vulgare. Animal studies show that this related plant can affect the function of the heart and lower blood pressure. In theory, the use of Polypodium leucotomos extract with medications that affect heart function or lower blood pressure may cause the effects of these drugs to increase. Use caution if combining polypodium with heart medications such as beta-blockers, calcium channel blockers, or digoxin.

Interactions with Herbs and Dietary Supplements

In theory, polypodium may increase the amount of drowsiness caused by some herbs or supplements.

In studies of a related fern species, Polypodium vulgare, animals treated with the herb developed low blood pressure and changes in heart function. In theory, the use of Polypodium leucotomos extract with herbs or supplements that lower blood pressure may cause the blood pressure to fall too low.

For the same reason, be cautious if using Polypodium leucotomos extract with herbs or supplements that have possible cardiac glycoside ingredients that can affect the function of the heart. Notably, bufalin/chan suis is a Chinese herbal formula that has been reported as toxic or fatal when taken with cardiac glycosides.


This information is based on a professional level monograph edited and peer-reviewed by contributors to the Natural Standard Research Collaboration (www.naturalstandard.com): Ethan Basch, MD (Natural Standard Research Collaboration); Samuel Basch, MD (Mt. Sinai Medical Center, NY); Heather Boon, B.Sc.Phm, PhD (University of Toronto); Dawn Costa, BA, BS (Natural Standard Research Collaboration); Paul Hammerness, MD (Harvard Medical School); Sadaf Hashmi, MD, MPH (Johns Hopkins School of Hygiene and Public Health); Shaina Tanguay-Colucci, BS (Natural Standard Research Collaboration); Catherine Ulbricht, PharmD (Massachusetts General Hospital); Wendy Weissner, BA (Natural Standard Research Collaboration); Jen Woods, BS (Natural Standard Research Collaboration).

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