@askdrnoor's progesterone vs progestin claim, fact-checked

What does this video actually claim?

Dr. Noor Al-Humaidhi states that progestins and progesterones aren't the same thing. This distinction matters for women considering hormone replacement therapy during menopause and perimenopause.

The video appears targeted at women navigating HRT options. It's categorized under TRT, though the content focuses on female hormone therapy rather than testosterone replacement.

The claim itself is straightforward but leaves out important context about why this difference matters clinically.

Does the science back this up?

Yes, the basic claim is accurate. Progesterone refers to the bioidentical hormone produced naturally by ovaries. Progestins are synthetic compounds that mimic progesterone's effects but have different chemical structures.

The Women's Health Initiative (Rossouw et al., JAMA, 2002) studied conjugated estrogens plus medroxyprogesterone acetate, a synthetic progestin. This trial found increased risks of breast cancer, stroke, and blood clots with this combination therapy.

However, the KEEPS trial (Harman et al., Menopause, 2014) and observational studies like the French E3N cohort (Fournier et al., Breast Cancer Research, 2008) suggest micronized progesterone may have different risk profiles than synthetic progestins.

What's the real clinical difference?

The distinction isn't just academic. Different progestins have varying effects on lipids, glucose metabolism, and breast tissue. Medroxyprogesterone acetate can negatively impact HDL cholesterol, while micronized progesterone appears more neutral.

The EPHT study (Canonico et al., BMJ, 2007) found oral estrogen plus micronized progesterone didn't increase venous thromboembolism risk, while synthetic progestins did show increased risk.

Breast cancer risk also appears different. The E3N study followed 80,377 postmenopausal women and found estrogen plus synthetic progestins increased breast cancer risk by 69%, while estrogen plus progesterone showed no significant increase.

What context is missing?

Dr. Al-Humaidhi's statement is correct but incomplete. She doesn't explain why this difference matters or what women should do with this information.

The video also doesn't mention that "bioidentical" doesn't automatically mean safer. FDA-approved micronized progesterone (like Prometrium) undergoes rigorous testing, while compounded bioidentical hormones often don't.

Most importantly, the choice between progesterone and progestins should involve discussing individual risk factors, not just assuming one is universally better. Some women may still benefit from synthetic progestins depending on their specific situation.

What should you actually know?

The progesterone versus progestin distinction is real and clinically relevant. If you're considering HRT, ask your provider about micronized progesterone as an option, especially if you have concerns about breast cancer or cardiovascular risk.

Don't assume all progestins are identical. Newer synthetic progestins like drospirenone have different properties than older ones like medroxyprogesterone acetate.

The research on bioidentical progesterone is promising but not definitive. Most studies are observational rather than large randomized trials, which limits how strongly we can conclude causation versus correlation.