Katu (Katuka (Katurohini))
Katu, known botanically as Vernonia amygdalina, is a herb used in Ayurveda. It is known for its bitter taste and is traditionally used for various medicinal purposes.
Botanical name: Vernonia amygdalina. Also known as: Bitter leaf, Congo Bololo, Grawa, Ewuro, Etidot, Onugbu, Ityuna, Oriwo, Awɔnwono, Chusar-doki, Shuwaka, Muluuza, Labwori, Olusia, Ndoleh, Olubirizi, Bitter-tea vernonia, Dembezeko, Inyathelo, Musikavakadzi, Muzhozho, Nyareru, Tree vernonia, Vernonie or Vernonie commune, Ndole, Sucumadeira, Pau Fede, South African leaves.
Properties
Antioxidant activity, Anti-inflammatory properties, Antimicrobial activity, Blood glucose lowering
Dosage
Decoction: Boil 40 g of dried leaves per liter of water for 15 minutes and drink 4 teacups three times a day. For antimalarial purposes in mice, oral administration of extracts has been used at doses of 400, 600, and 800 mg/kg. In studies with diabetic rats, an optimal dose of 400 mg/kg of ethanolic extract was used for 28 days. Methanolic leaf extracts have also been used at 200 mg/kg and 400 mg/kg. For anti-inflammatory purposes in rats, ethanol extracts have been administered at doses ranging from 50 to 200 mg/kg.
Classical attributes
- Rasa: Katu (bitter)
- Virya: ["Ushna (heating)"]
- Vipaka: ["Katu (pungent)"]
Benefits
- Deepana (appetizer)
- Pachana (digestive)
- Jvaraghna (antipyretic)
- Krimighna (anthelmintic)
- Raktapittahara (blood purifier)
Traditional uses
- Jwara (fever)
- Krimi (worms)
- Raktapitta (bleeding disorders)
- Prameha (diabetes)
Dosha effects
- vata: balancing
- kapha: balancing
- pitta: balancing
Preparation methods
- Decoction: Boiling the leaves in water.
- Extraction: Using solvents like ethanol, ethyl acetate, or chloroform to extract bioactive compounds.
- Aqueous Extract: Soaking pulverized fresh leaves in water and taking it orally.
- Vegetable: The leaves can be consumed as a vegetable in soups. Washing or boiling the leaves helps to reduce the bitter taste.
- Juice/Smoothie: Fresh leaves can be squeezed or blended into smoothies.
- Tea: Boiling the fresh leaves to make tea.
- Direct Consumption: Chewing the tender stem to release the bitter liquid.
- Powder: The dried leaves can be blended into a powder.
- Granules: Vernonia amygdalina water extract can be processed into granules.
Contraindications
- Excessive consumption can lead to acidity, dryness, and irritation.
- May cause digestive discomfort.
- Aggravation of Pitta and Vata doshas if taken in excess.
- People with a Pitta dominant constitution should use it cautiously.
- Excessive use may cause inflammation and diarrhea.
- May lead to insomnia and skin conditions.
- In the long term, it may cause muscle pain, dizziness, heartburn, constipation, and excessive thirst.
- Might trigger feelings of aggressiveness.
Side effects
- Generally considered safe, with few side effects reported.
- Some sources mention gastrointestinal discomfort as a potential side effect.
Interactions
- Limited research exists on specific drug interactions.
- May interact with medications used to manage diabetes due to its impact on blood sugar levels.
- It's crucial to consider potential interactions between bitter leaf and conventional medications to avoid adverse effects or diminished medication effectiveness.
Clinical evidence
Clinical trials suggest potential antimalarial and antidiabetic effects of Vernonia amygdalina. One clinical trial showed some efficacy in treating uncomplicated malaria, but with high recurrence rates. Studies also indicate that it can lower blood glucose levels. More research is needed to confirm these findings and establish safe dosages.
Ayurvedic karmas
- Deepana (appetizer)
- Pachana (digestive)
- Jvaraghna (antipyretic)
- Krimighna (anthelmintic)
- Raktapittahara (blood purifier)
Classical clinical indications
- Jwara (fever)
- Krimi (worms)
- Raktapitta (bleeding disorders)
- Prameha (diabetes)