Not quite a novel idea for most herbalists, yet a good reminder that [non-deglycyrrhinized] licorice can induce a potentially serious condition: a case report by Allcock and Cowdery (2015).
Allcock E, Cowdery J. Hypertension induced by liquorice tea. BMJ Case Rep. 2015 Jun 15;2015. pii: bcr2015209926. doi: 10.1136/bcr-2015-209926. PMID: 26077805.
Lovely piece of data: Miean KH, Mohamed S. Flavonoid (myricetin, quercetin, kaempferol, luteolin, and apigenin) content of edible tropical plants. J Agric Food Chem. 2001 Jun;49(6):3106-12. PubMed PMID: 11410016.
- onion leaves (1497.5 mg/kg quercetin, 391.0 mg/kg luteolin, and 832.0 mg/kg kaempferol)
- Semambu leaves (2041.0 mg/kg)
- bird chili (1663.0 mg/kg)
- black tea (1491.0 mg/kg)
- papaya shoots (1264.0 mg/kg)
- guava (1128.5 mg/kg).
The major flavonoid in these plant extracts is quercetin, followed by myricetin and kaempferol.
Luteolin could be detected only in:
- broccoli (74.5 mg/kg dry weight)
- green chili (33.0 mg/kg)
- bird chili (1035.0 mg/kg)
- onion leaves (391.0 mg/kg)
- belimbi fruit (202.0 mg/kg)
- belimbi leaves (464.5 mg/kg)
- French bean (11.0 mg/kg)
- carrot (37.5 mg/kg)
- white radish (9.0 mg/kg)
- local celery (80.5 mg/kg)
- limau purut leaves (30.5 mg/kg)
- dried asam gelugur (107.5 mg/kg).
Apigenin was found only in:
- Chinese cabbage (187.0 mg/kg)
- bell pepper (272.0 mg/kg)
- garlic (217.0 mg/kg)
- belimbi fruit (458.0 mg/kg)
- French peas (176.0 mg/kg)
- snake gourd (42.4 mg/kg)
- guava (579.0 mg/kg)
- wolfberry leaves (547.0 mg/kg)
- local celery (338.5 mg/kg)
- daun turi (39.5 mg/kg)
- kadok (34.5 mg/kg).
In vegetables, quercetin glycosides predominate, but glycosides of kaempferol, luteolin, and apigenin are also present. Fruits contain almost exclusively quercetin glycosides, whereas kaempferol and myricetin glycosides are found only in trace quantities.
In the editorial to the recent issue of Evidence-Based Complementary and Alternative Medicine, a broad review is given of the common misunderstandings about the safety of herbal medicines, and the following issues are highlighted:
1) Herbal medicines have been known to have adverse effects for as long as they have been used. The recent examples include Radix Bupleuri Chinensis, as well as ephedra (ma huang).
2) The herbal toxicity may be intrinsic (related to the herb per se) or extrinsic (related to product contamination, adulteration, misidentification, or improper processing or preparation).
3) Herb-drug interactions are common. As an example, concomitant use of Chinese herbal medicinal products and antipsychotic treatment was associated with nearly 60% risk of adverse outcomes.
4) Traditional methods of preparation often include specific steps to decrease toxicity, often accompanied with improved efficacy of the final product.
5) Dramatic examples of herbal toxicity are typically associated with inappropriate use of herbal medicines. Such is the example of ephedra (ma huang), used traditionally for respiratory disorders, but which caused several deaths, strokes, and heart attacks after being used “off-label” for weight reduction.
Peganum harmala oil: significant decrease in pain and difficulty in function in knee osteoarthritis (Abstract)
Fermented red ginseng (Panax ginseng): effects on cancer cells (Abstract)
Flavonoid fraction of Tilia americana and serotonergic drugs (Abstract)
Panax notoginseng saponin therapy is superior to the current treatment of acute intracerebral/intracranial hemorrhage: meta-analysis and mini-review of possible mechanisms of action (Abstract)
Liver injury associated with the use of herbal medicines and dietary supplements seems to be increasing (Abstract)
Cannabis smoking is shown to have additional adverse effects on respiratory health in tobacco smokers (Abstract)
A novel method to assess botanical-drug interactions, based on the use of human plasma/serum rather than chemical buffers, is more consistent with clinical data than earlier in vitro studies (Abstract)
Medicinal plants against multidrug-resistant enteropathogenic bacteria infecting hospitalized children under 5 (Abstract)
Thai medicinal plants against cervical and oral cancers (Abstract)
Peganum harmala seeds, Rhus coriaria fruit, and Urtica dioica leaves: antidiabetic, hypolipidemic, liver and renal damage-recovering effects in rats (Abstract)
Artemisia annua: effects on neutrophils (Abstract, Free full text)
Chrysanthemum zawadskii var. latilobum: hair growth-stimulating effect in mice (Abstract)
Traditional Chinese medicine: integration with Science
New insights into the chemical and biochemical basis of the “Yang-invigorating” action of Chinese Yang-tonic herbs (Abstract)
Pomegranate in the prevention and treatment of cardiovascular diseases (Abstract)
Chaenomeles speciosa (flowering quince): endurance increase in rats (Abstract)
Flos Lonicerae: anti-gastritic effects in rats (Abstract)
Rhizome Coptidis and berberine: the ban in Singapore is lifted (Abstract)
Astragaloside IV: attenuation of injury caused by myocardial ischemia/reperfusion in rats (Abstract)
Curcumin: healing effects on burn wounds in rats (Abstract)
Morin: protection of gastric mucosa from nonsteroidal anti-inflammatory drug-induced inflammation and apoptosis (Abstract)
Puerarin: amelioration of hepatic steatosis aka non-alcoholic fatty liver disease (Abstract)