(D-Phe12,Nle21,38,α-Me-Leu37)-CRF (12-41) (human, rat) is a CRF antagonist. (D-Phe12,Nle21,38,α-Me-Leu37)-CRF (12-41) (human, rat) prevents the IL-1a induced Luteinizing hormone (LH) inhibition.