androgens

https://ec.bioscientifica.com/view/journals/ec/aop/ec-24-0283/ec-24-0283.xml ABSTRACT Erythrocytosis, or elevated hematocrit, is a common side effect of testosterone therapy (TTh) in male hypogonadism. Testosterone stimulates erythropoiesis through an initial rise in erythropoietin (EPO)...