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And more importantly, is it even legal for your athletes to use

Sun X, Yi C, Zhu Y, Ding L, Xia S, Chen X, et al

From an endocrine perspective, experimental and animal data consistently indicate that E2 exerts insulin-sensitizing effects, whereas P4 tends to antagonize insulin action [4]

doi:10.1016/S0076-6879(71)18006-8