Bioidentical Hormone Replacement Therapy (BHRT)

What “Bioidentical” Actually Means

“Bioidentical” describes a hormone’s chemical structure: a bioidentical hormone has the same molecular structure as the hormones your body produces naturally. That is all the word means. It does not tell you whether a medication is compounded — that is a separate question.

Many FDA-approved hormone products are also bioidentical — estradiol and micronized progesterone products, for example. “Compounded,” by contrast, describes how a medication is prepared: made by a pharmacist for one patient, following one prescription. Some compounded hormones are bioidentical; some are not. The two words answer different questions, and marketing that blends them is worth noticing. Our article on what bioidentical hormone therapy is covers the vocabulary in more depth.

FDA-Approved Hormone Products and Compounded Preparations

FDA-approved hormone products are reviewed by the FDA for safety and effectiveness and carry standardized labeling that describes risks, benefits, and proper use. The category remains active and well-studied — in November 2025, for example, the FDA announced labeling updates for menopausal hormone therapy and approved a generic version of a widely used estrogen product.

Compounded hormone preparations are different in kind, not in quality claims: they are made per prescription and are not FDA-approved, which means they have not gone through FDA review and do not carry FDA-approved labeling. Professional guidance is consistent on the ordering: the American College of Obstetricians and Gynecologists (ACOG) advises that FDA-approved formulations are the appropriate choice when they meet a patient’s needs, and that compounded preparations are not routinely preferred when an approved product is suitable. A compounded preparation is not automatically safer, more effective, or better tolerated than an FDA-approved one.

When a Clinician May Consider a Compounded Formulation

ACOG’s guidance leaves room for compounding in specific situations — chiefly when an FDA-approved product cannot meet an individual patient’s needs. Common examples a clinician may weigh:

• •A documented allergy or sensitivity to an ingredient in the available FDA-approved products.
• •A strength or dose the patient needs that is not available in a manufactured product.
• •A dosage form that suits the patient better than what approved products offer — a topical form, for instance, when a form the patient can use matters for the treatment plan.

One caution from the same guidance: dosing compounded hormones on the basis of salivary hormone testing is not considered reliable, because hormone levels in saliva vary too much to steer treatment. If testing comes up in your care, the conversation belongs with your clinician. For a broader look at hormone-related symptoms and options, see our guides on navigating hormone imbalances and hormone therapy options for menopause.

Questions Worth Asking Your Clinician

Whether the prescription is your first or a continuation, a few questions make the plan clearer:

• •Ingredients and strength: what exactly is prescribed, at what strength, and how that was chosen for you.
• •Dosage form: cream, capsule, or another form — and how to use, measure, and store it.
• •Monitoring: what gets checked at follow-up, how progress is judged, and when to check in.
• •Alternatives: which FDA-approved options were considered and why this one fits you better.

These are standard questions for any hormone prescription — and worth asking explicitly. If hormone-related changes are also affecting libido or comfort, our sexual wellness service describes that related part of our practice.

Sierra’s Role: Review, Preparation, and Coordination

When your clinician sends a hormone prescription to Sierra, a pharmacist reviews the requested formulation — the ingredients, the strength, the dosage form, and how the preparation will be used. If anything needs clarifying, we contact your prescriber before preparing anything. We do not adjust a hormone formulation without your prescriber’s direction, and we will not prepare a prescription we have questions about.

Preparations are made in our non-sterile lab in Rancho Cucamonga, following USP 795 and USP 800 standards, with pharmacist oversight throughout. When you receive the medication, we can walk you through measuring or applying it, how to store it, and the beyond-use date on the label — the date after which it should no longer be used.

Getting Started

The first step is a conversation — with your clinician about whether hormone therapy is appropriate, and with us about the prescription itself. Your clinician can send the prescription directly to Sierra, or you can call (909) 989-9800 first with questions about a formulation, cost, or timing.

Cost depends on the ingredients, strength, form, and quantity — ask for pricing once we have reviewed the prescription, and we can explain what your insurance plan is likely to cover, since coverage for compounded medications varies by plan. For ongoing prescriptions, request refills before your supply runs low and ask us how much lead time your prescription needs. Our patient resources cover transfers, delivery, and the practical details.