**4. Stability of menaquinones**

The vitamin K2 was quite stable at room temperature for a period of up to 3 years. However, its concentration in final product was little affected by storage timed. Therefore, it is recom‐ mended that the menaquinone‐7 rich product should be stored not more than 15°C tempera‐ ture in a dry, cool, and dark place away from humidity, high heat, and sunlight.
