was ist k3 vitamin — what symptoms are typical?

Vitamin K3 (menadione) is a synthetic form of vitamin K not found naturally in foods. Unlike vitamins K1 and K2, K3 is poorly utilized by the body and can be toxic. Typical symptoms of K3 excess include oxidative stress, hemolytic anemia (destruction of red blood cells), and liver damage. High doses have been linked to allergic reactions and potential carcinogenicity. Deficiency symptoms are not applicable because K3 is not an essential dietary component; the body relies on natural K forms. In human medicine, K3 is rarely used; it appears mainly in animal feed. Evidence is weak: no robust human trials support K3 supplementation, and its use is banned in some countries. Consumers should avoid K3 and prioritize K1 (leafy greens) or K2 (fermented foods). MyBody-X tests do not assess K3-specific markers; the predictive value of DNA or biomarker tests for vitamin K metabolism is limited and should not guide supplementation without clinical context.