If you have started researching hormone therapy in Chandler AZ, you have almost certainly encountered the term 'bioidentical hormones.' It is one of the most searched topics in the HRT world — and also one of the most misunderstood. Here is a clear, evidence-based breakdown.

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What Are Bioidentical Hormones in Chandler AZ?

Bioidentical hormones are hormones that have the same molecular structure as the hormones naturally produced by the human body. Because their structure is identical to your own hormones, the theory is that your body recognizes and uses them more naturally.

Bioidentical hormones include:

• 17-beta estradiol — the primary form of estrogen in the body
• Micronized progesterone (brand name: Prometrium) — structurally identical to the progesterone your ovaries produce
• Testosterone — available in compounded and FDA-approved forms

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What Are Synthetic Hormones?

Synthetic hormones have a similar but not identical structure to your body's natural hormones. Medroxyprogesterone acetate (MPA), used in many older HRT formulations, is the most well-known synthetic progestin. The original Women's Health Initiative study used MPA, and much of the concern about HRT and breast cancer risk is tied specifically to synthetic progestins rather than natural progesterone.

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FDA-Approved Bioidentical vs. Compounded Bioidentical

This is an important distinction that often gets overlooked:

• FDA-approved bioidentical hormones (such as Vivelle-Dot patch, Estrace, Prometrium) are manufactured with strict quality and safety controls, tested for purity, potency, and consistency.
• Custom-compounded bioidentical hormones are mixed by compounding pharmacies to create individualized doses. While this can offer flexibility, compounded preparations are not FDA-regulated for safety or efficacy in the same way.

The major medical societies, including The Menopause Society, support the use of FDA-approved bioidentical hormones while urging caution with compounded preparations due to the lack of standardized oversight.

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Is One Safer Than the Other?

Current evidence suggests that micronized progesterone (bioidentical) may carry a lower breast cancer risk compared to synthetic progestins like MPA. Several European studies, including the large E3N cohort study, found that women using estradiol with micronized progesterone did not have the same elevated breast cancer risk seen with synthetic progestins.

This is a meaningful distinction, and it is one reason many providers — including our team at New Viva MD — prefer FDA-approved bioidentical formulations when appropriate.

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What About Saliva Testing for Custom Compounding?

Saliva hormone testing is often marketed alongside compounded bioidentical hormones. However, saliva tests are not considered reliable for guiding HRT dosing by the major medical societies. Serum (blood) testing remains the gold standard for assessing hormone levels.

Ready to take control of your hormonal health? Schedule a consultation at New Viva MD in Chandler, AZ, or connect with us via telemedicine anywhere in Arizona. Call (480) 331-4316 or visit newvivamd.com to book your appointment today