Phytomenadione (Vitamin K1) – Effects and Uses
Phytomenadione is the natural form of vitamin K1 and plays a key role in blood clotting and bone health. It is found in green leafy vegetables.
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Phytomenadione is the natural form of vitamin K1 and plays a key role in blood clotting and bone health. It is found in green leafy vegetables.
What is Phytomenadione?
Phytomenadione (also known as vitamin K1 or phylloquinone) is a fat-soluble compound naturally found in green leafy vegetables. It belongs to the vitamin K family and is the most biologically relevant form of vitamin K for the human body. Phytomenadione is used both as a dietary supplement and as a pharmaceutical agent.
Mechanism of Action
Phytomenadione serves as an essential cofactor for the enzyme vitamin K-dependent carboxylase. This enzyme activates several coagulation factors (II, VII, IX, and X) as well as the anticoagulant proteins C and S through a chemical modification called gamma-carboxylation. Without sufficient phytomenadione, these proteins cannot function properly, resulting in impaired blood clotting.
In addition, phytomenadione activates osteocalcin, a protein required for the incorporation of calcium into bone matrix, and Matrix Gla Protein (MGP), which inhibits vascular calcification.
Medical Uses
Treatment and Prevention of Vitamin K Deficiency
Phytomenadione is indicated in:
- Newborns to prevent vitamin K deficiency bleeding (previously known as haemorrhagic disease of the newborn)
- Patients with liver disease in whom synthesis of clotting factors is impaired
- Malabsorption syndromes (e.g., celiac disease, Crohn's disease, chronic pancreatitis)
- Long-term antibiotic use that disrupts the intestinal flora
Reversal of Vitamin K Antagonists
In cases of overdose with anticoagulants such as warfarin or phenprocoumon, phytomenadione is administered to reverse the anticoagulant effect. Depending on the clinical situation, it may be given orally or intravenously.
Dietary Sources
Phytomenadione is found in high amounts in the following foods:
- Green leafy vegetables: spinach, kale, broccoli, parsley
- Plant oils: soybean oil, canola oil, olive oil
- Legumes and certain fruits
Recommended Intake
The European Food Safety Authority (EFSA) recommends an adequate intake of 70 micrograms per day of vitamin K1 for adults. A balanced diet rich in vegetables generally provides sufficient amounts.
Deficiency Symptoms
A deficiency in phytomenadione may cause the following:
- Prolonged bleeding time and increased bleeding tendency
- Unexplained bruising (hematomas)
- Blood in urine or stool
- In newborns: life-threatening intracranial hemorrhage
- Long-term: increased risk of osteoporosis and vascular calcification
Dosage and Safety
Phytomenadione is considered very safe when taken orally at recommended amounts. Toxicity from dietary phytomenadione is virtually unknown. When administered parenterally (by injection), allergic reactions may occur in rare cases. Important: patients on vitamin K antagonist therapy should maintain a consistent dietary intake of vitamin K1 to avoid fluctuations in anticoagulation.
Interactions
Phytomenadione may interact with the following substances:
- Vitamin K antagonists (e.g., warfarin, phenprocoumon): phytomenadione counteracts their anticoagulant effect.
- Broad-spectrum antibiotics: may suppress vitamin K-producing gut bacteria and increase the need for phytomenadione.
- Bile acid sequestrants and certain lipid-lowering drugs: may reduce the absorption of fat-soluble vitamins including vitamin K1.
References
- Shearer MJ, Fu X, Booth SL – Vitamin K nutrition, metabolism, and requirements: current concepts and future research. Advances in Nutrition, 3(2):182–195, 2012. PubMed PMID: 22516726
- European Food Safety Authority (EFSA) – Dietary Reference Values for vitamin K. EFSA Journal, 2017. www.efsa.europa.eu
- World Health Organization (WHO) – Vitamin K supplementation in newborns. WHO Guidelines, 2023. www.who.int
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Related search terms: Phytomenadione + Phytomenadion + Vitamin K1 + Phylloquinone + Phylloquinon