Alkanet (Anchusa officinalis): Benefits, Dosage, Safety & Evidence

Questions fréquentes

How does Alkanet work as a demulcent and expectorant?

Alkanet works primarily through its mucilage content, which constitutes its demulcent properties. When the dried leaves are brewed into a tea, the mucilage forms a soothing, protective film over mucous membranes in the throat and respiratory tract. This action helps relieve irritation and inflammation, making it easier to cough up phlegm. While flavonoids contribute anti-inflammatory effects, the mechanism is largely physical rather than chemical. Note that evidence supporting these traditional uses is limited (Evidence Level: C/Traditional).

Is Alkanet safe to take during pregnancy?

No, Alkanet is considered unsafe during pregnancy and breastfeeding. The herb contains unsaturated pyrrolizidine alkaloids (PAs), which are potent hepatotoxins. These compounds can cross the placental barrier and may cause fetal liver damage or veno-occlusive disease. Additionally, these toxins can be excreted in breast milk, posing a risk to nursing infants. Due to these significant safety concerns, pregnant women and young children should strictly avoid all forms of Alkanet (Evidence Level: C).

What is the recommended dosage for Alkanet tea?

Traditional herbal texts recommend an adult dosage of 2–3 grams of dried Alkanet leaves prepared as an infusion (tea) for chest complaints. For external use, a poultice made from the root is applied directly to wounds or skin inflammations. Due to the presence of toxic pyrrolizidine alkaloids, internal use should be restricted to short durations only. This herb is not suitable for children, pregnant women, or individuals with liver disease (Evidence Level: Traditional).

Does Alkanet interact with medications?

There are no specific clinical studies on Alkanet drug interactions, but theoretical risks exist. Because it contains pyrrolizidine alkaloids (PAs), it poses a risk of liver toxicity and should not be combined with other drugs that stress the liver, such as acetaminophen, statins, or antifungal medications. Additionally, tannins in the plant may interfere with the absorption of iron supplements or alkaloid-based medications. Patients on hepatotoxic medications should avoid this herb (Evidence Level: D).

Why is Alkanet considered toxic?

The primary safety concern regarding Alkanet is its pyrrolizidine alkaloid (PA) content. PAs are known to cause liver damage, specifically hepatic veno-occlusive disease, which can be fatal. Long-term or excessive internal use leads to the accumulation of these toxins in the liver. Side effects may include nausea, vomiting, abdominal pain, and jaundice. Because the root contains higher concentrations of these alkaloids, internal use is highly discouraged in modern practice (Evidence Level: C).

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 30 articles PubMed · modèle : gemma4:31b

Résumé

Alkanet, including species such as Anchusa officinalis and Alkanna tinctoria, is a medicinal herb used traditionally for wound healing and as a natural colorant [PMID:40135263, PMID:37905985].

Contexte

Alkanet refers to medicinal plants including Anchusa officinalis (common bugloss), a deep-rooted hairy perennial herb [PMID:40135263], and Alkanna tinctoria, a plant native to Europe, Asia, and the Middle East [PMID:37905985].

Usages traditionnels

In folk medicine, Anchusa officinalis is used for wound recovery [PMID:40135263], and Alkanna tinctoria is used traditionally in Saudi Arabia to treat skin infections [PMID:39765658]. It has also been used for thousands of years as a colorant for textiles, food, and cosmetics [PMID:37905985].

Composés actifs

Key compounds include alkannin [PMID:38804306, PMID:34543990], rosmarinic acid [PMID:32548486, PMID:18613136], luteolin [PMID:32548486], chlorogenic acid [PMID:32548486], and naphthazurin derivatives [PMID:37905985].

Mécanisme d'action

Anchusa officinalis aerial part extracts (APEAO) accelerate wound healing by improving transforming growth factor beta 1 expressions and antioxidant levels, while inhibiting TNF-α and IL-6 [PMID:40135263]. Quantum sensing methods suggest possible hydrogen bonding between principal substances (such as alkannin) and the Tyr-Met-His active area of the COVID protein [PMID:38804306].

Preuves cliniques

Preuve DWound healing (rats)

Topical administration of Anchusa officinalis aerial part extracts (250 and 500 mg/kg) accelerated wound healing via improvement of TGF-β1 and antioxidant levels and inhibition of TNF-α and IL-6 [PMID:40135263]

Preuve DSkin infections (diabetic mice)

Methanolic extract and traditional hydrophobic formulations of Alkanna tinctoria root exhibited antibacterial and antibiofilm activity against MRSA and MDR-Pseudomonas aeruginosa [PMID:39765658]

Preuve DDiabetes (in vitro)

Polyphenolic-rich extracts of Anchusa officinalis presented significant α-glucosidase inhibitory activity [PMID:32548486]

Sécurité et effets indésirables

In rats, Anchusa officinalis aerial part extracts did not cause toxic damage at doses up to 5 g/kg [PMID:40135263]. However, a methanolic extract of Alkanna tinctoria was found to be relatively more cytotoxic on human keratinocyte (HaCaT) cells compared to a traditional hydrophobic formulation [PMID:39765658].

Synthèse des preuves

The current evidence is based on in vitro studies and animal models (rats and mice), indicating potential for wound healing and antimicrobial activity, but lacks human clinical trial data.

Sources PubMed

1.PMID: 38804306 (2024) — Structural and Functional Characterization of Medicinal Plants as Selective Antibodies towards Therapy of COVID-19 Symptoms. · Antibodies (Basel, Switzerland)
2.PMID: 35888697 (2022) — The Metabolic Profile of Anchusa officinalis L. Differs According to Its Associated Arbuscular Mycorrhizal Fungi. · Metabolites
3.PMID: 40002028 (2025) — Comparison of the Potential of "Green" Classical and Natural Deep Eutectic Solvents in the Production of Natural Food Colorant Extracts from the Roots of Alkanna tinctoria (L.). · Foods (Basel, Switzerland)
4.PMID: 32548486 (2020) — In Vitro Evaluation of Antidiabetic and Anti-Inflammatory Activities of Polyphenolic-Rich Extracts from Anchusa officinalis and Melilotus officinalis. · ACS omega
5.PMID: 37905985 (2023) — Using extract from alkanet (Alkanna tinctoria) as a source of both a red lipid stain and a blue counterstain for histology.

Alkanet

Sources et citations

Calculer une dose sûre de Alkanet

Enterolobium cyclocarpum

Liquidambar orientalis

Piper sarmentosum

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Synthèse des preuves

Sources PubMed

Sources gouvernementales

Alkanet

Sources et citations

Calculer une dose sûre de Alkanet

Plantes associées

Enterolobium cyclocarpum

Liquidambar orientalis

Piper sarmentosum

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Synthèse des preuves

Sources PubMed

Sources gouvernementales