was ist k3 — what can you do yourself?

The question about 'K3' is ambiguous without further context. In nutrition, K3 may refer to menadione (vitamin K3), a synthetic form of vitamin K. However, vitamin K3 is controversial: it can generate oxidative stress and is potentially toxic at high doses. Natural forms vitamin K1 (phylloquinone) and K2 (menaquinone) are better studied and considered safe. What you can do yourself: Focus on a balanced diet rich in green leafy vegetables (K1) and fermented foods like natto (K2). If you have a blood or DNA test indicating 'K3', consult your doctor to determine if a true deficiency exists. The provided knowledge context contains no specific information on K3, so the evidence is unclear.