Verbatim response from Perplexity
The main difference is what the hormones are made to match: bioidentical hormones are chemically identical to the hormones your body makes, while standard HRT often uses hormones that are similar but not identical, including synthetic or animal-derived forms.[4][5][8][9]
In practice, the term “bioidentical” does not automatically mean safer or more effective. Major medical sources note that the marketing claims for compounded bioidentical hormones are not well supported, and that FDA-approved bioidentical options exist alongside traditional HRT.[8][9]
- Bioidentical hormones: designed to match human estrogen/progesterone/testosterone exactly; they can be FDA-approved or compounded.[5][8][9]
- Standard HRT: may use synthetic or animal-derived hormones that mimic human hormones but are not structurally identical.[4][5]
- Safety/effectiveness: current evidence does not show that bioidentical hormones are consistently safer or more effective than traditional HRT; compounded versions add extra variability in dose and purity.[1][8][9]
A useful practical distinction is that FDA-approved bioidentical hormones are different from compounded bioidentical hormones: the first have been tested and standardized, while the second may vary between pharmacies and batches.[8][9]
If you want, I can also compare bioidentical vs compounded bioidentical vs conventional HRT in a simple table.