Estradiol-d2-1（Cat No.:I043818）is a stable isotope-labeled form of estradiol, a primary estrogen hormone involved in regulating various physiological processes, including reproductive health and bone density. The “d2” denotes the incorporation of two deuterium atoms, which are heavier isotopes of hydrogen, allowing for precise tracking and quantification in analytical studies. Estradiol-d2-1 is commonly used in pharmacokinetic studies, hormone metabolism research, and clinical assays to trace estradiol’s distribution, metabolism, and effects in the body. This isotope-labeled compound helps to differentiate endogenous estradiol from exogenous sources in complex biological systems.