ラクトゲンMeanings1nounlactogenA substance that promotes milk production; a term used in biology and medicine.from German Laktogenラクトゲンは乳にゅう腺せんの発はっ達たつを促うながすホルモン様よう物ぶっ質しつです。Lactogen is a hormone-like substance that promotes mammary gland development.