A substance or pigment that produces or creates a red color, or a compound that stimulates the production of red blood cells.
From Greek erythro- (red) + -gen (producer or generator). This term uses the common -gen suffix found in words like oxygen (acid-generator) and hydrogen (water-generator) to indicate something that produces redness.
Erythropoietin (EPO) is the natural erythrogen in your body—it's a hormone produced by kidneys that tells your bone marrow to make more red blood cells! Athletes have been caught doping with synthetic erythrogen to boost oxygen-carrying capacity and endurance.
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