Riboflavin is a B vitamin. It can be found in certain foods such as milk, meat, eggs, nuts, enriched flour, and green vegetables. Riboflavin is frequently used in combination with other B vitamins in vitamin B complex products.
embodied - possessing or existing in bodily form; what seemed corporal melted as breath into the wind- Shakespeare; an incarnate spirit; `corporate' is an archaic term. incarnate, bodied, corporal, corporate.
The definition of an embodiment is  a visible or tangible form or a concrete example of an idea or concept. When someone is really cheerful and sunny and happy all the time, this person might be described as the embodiment of happiness.