Health Concerns Marrow Plus is a dietary supplement for bone marrow support. Red blood cells, white blood cells and platelets are formed in the bone marrow. If the marrow is unable to form these, the entire body is affected. Marrow Plus supports cell production in the marrow as well as vitalizing and nourishing the blood. Recommended usage: Three tablets 2 to 3 times per day between meals, or as directed by your healthcare professional.