Fougère douce (Comptonia peregrina): Benefits, Dosage, Safety & Evidence

Questions fréquentes

How does Sweet Fern work to treat diarrhea?

Sweet Fern contains significant amounts of tannins and catechins, which provide strong astringent properties. These compounds work by binding to proteins in the mucous membranes of the digestive tract, creating a protective layer that reduces inflammation and fluid secretion. This astringent action helps tone the intestinal lining and reduce the frequency of loose stools. While direct clinical trials are limited, this mechanism is well-understood through traditional use and pharmacological analysis (Evidence Level C).

Can you take Sweet Fern with prescription medications?

There are currently no documented significant drug interactions for Sweet Fern (Comptonia peregrina). However, because the herb contains tannins, it may theoretically interfere with the absorption of certain medications or minerals if taken simultaneously. To be safe, separate the consumption of Sweet Fern tea from prescription medications by at least one to two hours. Always consult a healthcare provider before adding herbal supplements to your regimen.

What is the recommended dosage for Sweet Fern tea?

The standard adult dosage for Sweet Fern is 2 to 3 grams of dried leaves prepared as a tea. To prepare, steep the dried herb in boiling water for 10 to 15 minutes. This dosage is traditionally used to manage gastrointestinal upset and diarrhea. For external applications, the leaves can be prepared as a poultice for wounds or used as a smoke fumigant for insect repellent purposes.

Is Sweet Fern safe to use during pregnancy?

Sweet Fern is generally considered safe during pregnancy when used in moderate amounts, based on traditional use profiles. It does not contain known uterine stimulants or toxic alkaloids. However, as with any botanical remedy, specific clinical safety data for pregnant populations is limited. Pregnant individuals should consult a qualified healthcare provider or midwife before using Sweet Fern to ensure it is appropriate for their specific health history.

What are the traditional uses of Sweet Fern?

Sweet Fern has a rich history of use by Indigenous peoples of Eastern North America, such as the Abenaki. It was primarily utilized as an astringent remedy for diarrhea and dysentery. Topically, the leaves were applied as poultices to promote wound healing and treat skin conditions. Additionally, the aromatic plant was burned as a smoke fumigant or applied to the skin to repel insects, utilizing its volatile oil content (Evidence Level C/Traditional).

Fiche d'information compilée à partir de PubMed

Cette fiche a été compilée à partir de résumés PubMed (NIH) avec l'assistance d'une IA. Chaque affirmation factuelle est citée par un article PubMed réel (voir la liste des sources). Elle n'a pas encore été révisée par un humain — confirmez auprès d'un professionnel de santé avant utilisation.

Compilé à partir de 17 articles PubMed · modèle : gemma4:31b

Résumé

Sweet fern (Comptonia peregrina) is a woody angiosperm native to eastern North America [PMID:36138805, PMID:17757592] known for its nitrogen-fixing symbiotic relationship with Frankia bacteria [PMID:17757592, PMID:30978227].

Contexte

Comptonia peregrina is a monotypic genus of the Myricaceae family primarily found in eastern North America, though fossil records indicate a wider Northern Hemisphere distribution during the Cenozoic [PMID:36138805]. It is an actinorhizal shrub that forms root nodule symbioses with N2-fixing actinomycetes of the genus Frankia [PMID:10508084, PMID:30978227].

Usages traditionnels

Used in traditional medicine from Canada against cancer [PMID:17326040].

Composés actifs

Essential oils contain eucalyptol (17.9%), β-caryophyllene (up to 35.3%), terpinene-4-ol (5.1%), and γ-terpinene (4.0%) [PMID:41619107]. Leaf glands produce flavonoid aglycones including chrysin, galangin, pinocembrin, and their methyl ethers, as well as a novel flavanone called comptonin [PMID:23195863]. Leaves also contain the antimicrobial phenolic stilbene (E)-3-hydroxy-5-methoxystilbene [PMID:18849164].

Preuves cliniques

Preuve DCancer (in vitro)

A 30-60 min hydrodistillation fraction of leaf essential oil demonstrated cytotoxic activity against human lung carcinoma (A-549) and human colon adenocarcinoma (DLD-1) cell lines [PMID:17326040].

Preuve DGram-positive bacterial infections (in vitro)

The phenolic stilbene (E)-3-hydroxy-5-methoxystilbene isolated from leaves showed inhibitory activity against methicillin-resistant Staphylococcus aureus (MRSA), Mycobacterium bovis BCG, and avirulent Bacillus anthracis [PMID:18849164].

Preuve DTick infestation (repellent)

Essential oils exerted significant dose- and time-dependent repellent activity towards Ixodes scapularis nymphs and reduced attraction of adult I. scapularis and D. variabilis ticks [PMID:41619107].

Synthèse des preuves

The available evidence is limited to in vitro laboratory studies (cytotoxicity, antimicrobial activity) and entomological repellent assays; there are no human clinical trials provided.

Sources PubMed

1.PMID: 41619107 (2026) — Efficacy of a novel tick attractant and repellent activity of essential oils from sweet fern, Comptonia peregrina (L.) Coult. · Experimental & applied acarology
2.PMID: 31877179 (2019) — Lowbush blueberry fruit yield and growth response to inorganic and organic N-fertilization when competing with two common weed species. · PloS one
3.PMID: 36138805 (2022) — A New Species of Comptonia (Myricaceae) from the Early Miocene of Central Inner Mongolia, China, and Phytogeographic History of Sweet-Fern. · Biology
4.PMID: 17757592 (1978) — Isolation and Cultivation in vitro of the Actinomycete Causing Root Nodulation in Comptonia. · Science (New York, N.Y.)
5.PMID: 23195863 (1985) — Leaf Gland Flavonoids in Comptonia peregrina and Myrica pensylvanica (Myricaceae).

Fougère douce

Sources et citations

Calculer une dose sûre de Fougère douce