Micronized progesterone or a synthetic progestin?
Different progestogens can have different uses, schedules and side effects. Start with the specific medicine and the reason it is being prescribed.
The short answer
Micronized progesterone is a form of progesterone; synthetic progestins are a broader group of different molecules. A whole category cannot be ranked against one medicine as universally safer or more effective.
Side by side
| Micronized progesterone | Synthetic progestins | |
|---|---|---|
| What is being compared | A specific hormone formulation | A class containing different medicines |
| Relevant treatment question | Endometrial protection with the prescribed estrogen regimen | The indication and evidence for the specific progestin |
| Route matters | Oral capsule data do not validate every cream | Product-specific dose and route are essential |
What the evidence shows
Approved progesterone capsule labeling includes prevention of endometrial hyperplasia in postmenopausal women with a uterus receiving the specified estrogen regimen. Evidence for one formulation should not be extended to a compounded cream or to every schedule.
Read: Progesterone capsule prescribing information; ACOG: Compounded bioidentical menopausal hormone therapy.
What matters for your decision
Ask which estrogen regimen the progestogen accompanies, the schedule and what bleeding changes need evaluation. Oral progesterone may cause dizziness or drowsiness. Review the actual product’s ingredients, contraindications and instructions.
Questions
Can I assume a progesterone cream provides the same protection as a capsule?
No. Do not substitute routes or assume equal absorption. Endometrial protection needs evidence for the dose, route and regimen being used.
Sources
- Progesterone capsule prescribing information
DailyMed. Endometrial protection in the specified estrogen regimen; precautions and adverse effects.
- ACOG: Compounded bioidentical menopausal hormone therapy
Clinical Consensus, 2023. Evidence limits and selection of approved versus compounded formulations.
