Does @drcaryssonnenberg's progesterone advice hold up?

What does this video actually claim?

Dr. Carysson Enberg tells viewers with a uterus to take progesterone or progestogen exactly as prescribed, either cyclically for 12-14 days monthly or continuously every day. She says this protects the endometrium as part of HRT and can be delivered through a 52mg LNG IUD (replaced within 5 years) or oral capsules/tablets.

The advice targets women using hormone replacement therapy who need endometrial protection. Her post emphasizes following doctor's orders rather than making your own dosing decisions.

Does the science back this up?

Yes, the endometrial protection claim is rock solid. The Women's Health Initiative (Rossouw et al., JAMA, 2002) showed that estrogen alone increased endometrial cancer risk by 81% in women with intact uteri. Adding progestogen eliminates this excess risk.

The PEPI trial (Writing Group for the PEPI Trial, JAMA, 1995) confirmed that 12-14 day cyclic progestogen prevents endometrial hyperplasia in 96% of women taking estrogen. Continuous daily progestogen works even better, with near-zero breakthrough bleeding after the first year.

Her IUD timeline is accurate too. The Mirena 52mg levonorgestrel IUD provides adequate endometrial protection for 5 years, as shown in multiple studies including Varila et al. (Obstet Gynecol, 2001).

What did they get wrong?

Nothing major, but the video oversimplifies dosing complexity. She doesn't mention that micronized progesterone doses typically range from 100-200mg daily, or that synthetic progestogens like medroxyprogesterone acetate require different schedules.

The "12-14 consecutive days" guidance is standard, but some women need longer cycles. The HOPE study (Sturdee et al., Climacteric, 2000) found that 10% of women required 16+ day cycles to prevent breakthrough bleeding.

She also doesn't address timing within the month, which matters for symptom control and adherence.

Are there safety concerns she missed?

Dr. Enberg correctly emphasizes following medical supervision, but she doesn't mention key safety signals. The WHI showed that oral progestogens slightly increase breast cancer and stroke risk compared to progesterone-only approaches.

The ESTHER study (Fournier et al., Breast Cancer Res Treat, 2008) found that micronized progesterone carried lower breast cancer risk than synthetic progestogens like norethisterone. This distinction matters for long-term users.

IUD users should know about the 5-10% expulsion rate and potential for irregular bleeding in the first 3-6 months.

What should you actually know?

Take your progestogen as prescribed, full stop. Skipping doses or stopping early puts your endometrium at risk, especially if you're on estrogen therapy.

The delivery method matters less than consistency. Whether you choose pills, IUDs, or other forms, the goal is steady endometrial protection. Most gynecologists prefer micronized progesterone over synthetic versions when possible.

Work with your doctor to find the right schedule. Some women feel better on continuous dosing, others prefer cyclic. The "right" approach is the one you'll actually follow long-term.