Bioidentical hormones are typically derived from plant precursors, such as diosgenin from wild yams or soy. Through laboratory synthesis, these precursors are converted into hormones that have the exact molecular structure as endogenous human hormones like estrogen, progesterone, and testosterone.

This molecular "match" is crucial because it allows the hormone to bind to cellular receptors in the same way the body's natural hormones would. In 2026, advanced chromatography is used to ensure the purity of these compounds, ensuring they are free from the synthetic "side-chains" found in traditional HRT that have been linked to metabolic variations.