was ist vitamin k3 — what can you do yourself?

Vitamin K3 (menadione) is a synthetic form of vitamin K that does not occur naturally. It is mainly used in animal feed because it can be toxic to humans – causing oxidative stress, liver damage, and hemolytic anemia. In many countries, it is banned for human supplementation. What you can do yourself: Avoid any K3 supplements. Instead, focus on natural vitamin K sources. Vitamin K1 (phylloquinone) is abundant in leafy greens like spinach, kale, and broccoli. Vitamin K2 (menaquinone) is found in fermented foods such as natto, sauerkraut, and also in cheese and egg yolks. A balanced diet usually provides enough vitamin K. If you suspect a deficiency (e.g., due to gallbladder issues or anticoagulant therapy), consult a doctor before supplementing – and if needed, use K1 or K2, not K3. Claims that K3 is more effective than natural K are not supported by evidence and carry unnecessary health risks.