2937.23.50.20 - Progesterone

This HTS classification, 2937.23.50.20, specifically identifies progesterone, a naturally occurring steroid hormone primarily known for its role in the menstrual cycle, pregnancy, and embryonic development. It encompasses both naturally sourced progesterone and synthetic versions that are structurally identical or closely analogous, utilized for their hormonal effects. This category is reserved for progesterone itself and does not include other hormonal substances or complex derivatives that might fall under broader headings.

Within the broader category of "Estrogens and progestins," this specific sub-classification for progesterone distinguishes it from other progestins, which may have slightly different chemical structures or therapeutic applications but are not precisely progesterone. The distinction is crucial for accurate tariff application, ensuring that only goods fitting the precise chemical definition of progesterone are classified here.

As a leaf node, 2937.23.50.20 does not have further subcategories. This means that all forms and purities of progesterone, when classified under the "Other" provisions within "Estrogens and progestins," will find their final classification at this specific HTS code. The emphasis remains on identifying the substance as progesterone, irrespective of its specific salt form or purity, as long as it retains its identity as the hormone.