2937.23.10.10 - Estrogens

This HTS category encompasses estrogens and their derivatives, specifically those obtained directly or indirectly from animal or vegetable materials. This includes natural estrogens extracted from biological sources or synthesized compounds that mimic their structure and function, and are primarily used for their hormonal properties. The key defining characteristic for classification here is the origin of the material, which must be animal or vegetable.

This classification is distinguished from its sibling category, ": Other:", by the explicit requirement of the source material. While the sibling category would cover estrogens and their derivatives not derived from animal or vegetable sources, this section is strictly for those with a biological origin. This distinction is crucial for accurate tariff application and often relates to different regulatory controls or source verification requirements.

As this node is a leaf node, there are no further subcategories. Therefore, the focus for classification under 2937.23.10.10 is on identifying if the estrogen or its derivative is demonstrably sourced from animal or vegetable matter, as opposed to being entirely synthetically produced without such biological precursors. Examples might include estradiol extracted from animal sources or specific plant-derived phytoestrogens.