Menadione

[8] Proponents of the latter name generally argue that the compound is not a real vitamin due to its artificial status (prior to its identification as a circulating intermediate) and its lack of a 3-methyl side chain preventing it from exerting all the functions (specifically, it cannot act as a cofactor for GGCX in vitro)[9] of the K vitamins.

It is an intermediate in the chemical synthesis of vitamin K by first reduction to the diol menadiol, which is susceptible to coupling to the phytol.

Although handling may be hazardous, the European Food Safety Authority found in 2013 that it is an effective source of vitamin K in animal nutrition that does not pose a risk to the environment.

[14] Despite the fact that it can serve as a precursor to various types of vitamin K, menadione is generally not used as a nutritional supplement in economically developed countries.

Menadione for human use at pharmaceutical strength is available in some countries with large lower income populations, such as India.

Skeletal formula
Skeletal formula
Ball-and-stick model
Ball-and-stick model
The menadione core is apparent in the structure of vitamin K .