Vitamin K2

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What Wikipedia says

Vitamin K2 or menaquinone (MK) () is one of three types of vitamin K, the other two being vitamin K1 (phylloquinone) and K3 (menadione). K2 is both a tissue and bacterial product (derived from vitamin K1 in both cases) and is usually found in animal products or fermented foods.

Excerpt from the Wikipedia article “Vitamin K2”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NEUROtiker (talk), Public domain, via Wikimedia Commons.