Écorce de sumac (Rhus glabra): Benefits, Dosage, Safety & Evidence

Questions fréquentes

How does sumac bark work as an astringent?

Sumac bark contains high concentrations of gallotannins, which are polyphenolic compounds that bind and precipitate proteins. When applied to wounds or mucous membranes, these tannins create a protective layer over tissues, reducing inflammation, decreasing secretions, and promoting wound contraction. The astringent action helps slow bleeding and forms a barrier against pathogens. Sumac also contains malic acid and citric acid, which contribute antimicrobial effects. This protein-binding mechanism is well-established in tannin-rich botanicals, though clinical trials specifically on sumac bark remain limited (Evidence Level C).

Is sumac bark safe to take during pregnancy?

No, sumac bark is considered unsafe during pregnancy and should be avoided. The high tannin content can interfere with iron and nutrient absorption, which is particularly concerning during pregnancy when iron requirements increase significantly. Additionally, some Rhus species may contain compounds that stimulate uterine contractions. Traditional Native American use records indicate caution for pregnant women. There are no clinical studies establishing safety in pregnant populations (Evidence Level C). Women who are pregnant, nursing, or attempting to conceive should not use sumac bark internally.

What is the recommended dosage for sumac bark tea?

The traditional adult dosage for sumac bark is 3-6 grams of dried bark or berries prepared as a tea daily. To prepare, steep approximately 1-2 teaspoons of dried bark in 8 ounces of hot water for 10-15 minutes. This dosage is based on ethnobotanical records and traditional Native American use rather than clinical trials (Evidence Level C). For external wound care, a stronger decoction can be prepared and applied as a wash once cooled. Do not exceed recommended amounts, as excessive tannin intake commonly causes constipation.

Does sumac bark interact with any medications?

Sumac bark's high tannin content may reduce the absorption of certain medications, particularly alkaloid-based drugs and minerals like iron supplements. Tannins bind to compounds in the digestive tract, potentially decreasing medication effectiveness. Individuals taking diabetes medications should exercise caution, as sumac has traditional use for lowering blood sugar and may have additive effects (Evidence Level C). No specific clinical drug interaction studies exist for sumac bark. To minimize interactions, separate sumac consumption from medications by at least 2 hours and consult a healthcare provider before combining with prescription drugs.

Can sumac bark help manage diabetes?

Sumac bark has extensive traditional use by Native American nations for managing diabetes and related symptoms. The plant contains ellagic acid and other polyphenols that may support glucose metabolism through antioxidant mechanisms. However, human clinical trials specifically examining sumac bark's antidiabetic effects are lacking (Evidence Level C). While some related Rhus species have demonstrated hypoglycemic activity in preliminary animal research, these findings cannot be directly extrapolated to human therapeutic use. People with diabetes should not substitute sumac for prescribed medications and should consult a healthcare provider before use.

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 29 articles PubMed · modèle : gemma4:31b

Résumé

Sumac (Rhus species) is used as a spice and medicinal herb with noted antioxidant, antimicrobial, and metabolic benefits [PMID:32816615, 32042964]. However, certain species like poison sumac cause severe allergic contact dermatitis [PMID:36638373, 38925778].

Contexte

Sumac includes various species within the Anacardiaceae family, such as Rhus coriaria (Mediterranean sumac), Rhus typhina (staghorn sumac), and Rhus glabra [PMID:33430013, 28764017, 8072309]. While some are used as food spices and nutraceuticals, others, such as poison sumac, are known to cause type IV hypersensitivity reactions [PMID:36014419, 36638373].

Usages traditionnels

Traditionally used in folk medicine by North American native people [PMID:8072309] and in the Mediterranean for managing hemorrhoids, wound healing, diarrhea, ulcers, and eye inflammation [PMID:33430013, 32141706].

Composés actifs

Sumac contains tannins (including gallotannins and ellagitannins), polyphenols, flavonoids, organic acids, essential oils, and phenolic acids such as gallic acid [PMID:32816615, 36014419, 16153405, 8072309].

Mécanisme d'action

Bioactive compounds exhibit free oxygen radical-scavenging effects and antioxidant capacities [PMID:32816615, 33430013]. Specific constituents like gallic acid target molecular pathways to prevent cancer progression and metastasis [PMID:37755616], while others may regulate IRS-1/PI3K/AKT pathways and promote Nrf2 nuclear translocation [PMID:37764863].

Preuves cliniques

Preuve ALipid Profile

Significant decrease in total cholesterol [PMID:37864474].

Preuve AMetabolic Syndrome

Supplementation decreased systolic blood pressure [PMID:37189189] and improved cardiometabolic risk factors [PMID:34334274].

Preuve AGlycemic Control

Meta-analysis showed no significant effect on fasting blood glucose or HbA1c [PMID:34365008], though other studies suggest potential anti-diabetic properties [PMID:32816615].

Preuve BAppetite in Obese Women with Depression

3g/day supplementation significantly reduced appetite scores, serum leptin, NPY, insulin, and HOMA-IR [PMID:36753796].

Preuve DBacterial Infections

Methanol extracts of Rhus glabra yielded antibacterial compounds including methyl gallate and 4-methoxy-3,5-dihydroxybenzoic acid [PMID:8072309].

Sécurité et effets indésirables

Exposure to urushiol in poison sumac causes a pruritic erythematous rash with vesicles and bullae [PMID:36638373]. There is potential for IgE cross-reactivity in individuals allergic to cashew nuts [PMID:30368491].

Synthèse des preuves

Evidence for metabolic and lipid improvements is strong (Meta-analyses), while antimicrobial and antiviral claims are based on in vitro or animal studies. Safety data is primarily focused on the dermatological toxicity of specific species.

Sources PubMed

1.PMID: 38925778 (2024) — Plant Dermatitis. · Emergency medicine clinics of North America
2.PMID: 32491789 (2026) — Rhus (Toxicodendron) dermatitis. · Primary care
3.PMID: 36638373 (2022) — Botanical Briefs: Toxicodendron Dermatitis. · Cutis
4.PMID: 28764017 (2017) — Chemical composition and biological activity of staghorn sumac (Rhus typhina). · Food chemistry
5.PMID: 32816615 (2021) — Could Sumac Be Effective on COVID-19 Treatment? · Journal of medicinal food
6.PMID: 36014419

Écorce de sumac

Sources et citations

Calculer une dose sûre de Écorce de sumac

Acacia arabica

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Terminalia catappa

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Synthèse des preuves

Sources PubMed

Sources gouvernementales

Écorce de sumac

Sources et citations

Calculer une dose sûre de Écorce de sumac

Plantes associées

Acacia arabica

Jatropha gossypiifolia

Terminalia catappa

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Synthèse des preuves

Sources PubMed

Sources gouvernementales