2937.23.10.20 - Progesterone

This HTS category, specifically 2937.23.10.20, encompasses Progesterone. Progesterone is a steroid hormone crucial in the menstrual cycle, pregnancy, and embryogenesis. It is a key component within the broader group of steroidal hormones, derivatives, and structural analogues, which are primarily used for their hormonal effects. This classification includes progesterone whether it is naturally derived from animal or vegetable sources or synthesized through chemical processes.

The distinction from its sibling category, 2937.23.10.50 ("Other"), lies in the specific identification of Progesterone. While the "Other" category would capture any steroidal progestins that do not fall under this specific Progesterone classification, 2937.23.10.20 is designated solely for Progesterone itself. This precise coding ensures accurate tracking and tariff application for this particular hormone.

As this is a leaf node in the HTS structure, there are no further subcategories. Therefore, classification under this code is definitive for Progesterone meeting the criteria of being a steroidal hormone, a progestin, and obtained directly or indirectly from animal or vegetable materials, or reproduced by synthesis. This designation is essential for customs authorities to correctly identify and duty-assess shipments of this substance.