PMDD (Premenstrual Dysphoric Disorder): The Evidence-Based Supplement Protocol

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Premenstrual dysphoric disorder is the severe, mood-dominant form of PMS classified as a depressive disorder in DSM-5. SSRIs (continuous or luteal-phase) and combined oral contraceptives (drospirenone-containing) remain first-line. Several supplements have credible RCT evidence as adjuncts or alternatives in milder cases.

Calcium, 1,200 mg Daily

The Thys-Jacobs 1998 RCT in 466 women with PMS showed calcium carbonate 1,200 mg/day reduced overall premenstrual symptom score by 48% over 3 cycles versus 30% placebo response. Effect on mood symptoms was substantial. Take in divided doses ≤500 mg per dose; use citrate if on PPIs. See calcium piece.

Vitamin B6, 50–100 mg Daily Continuous

A 1999 meta-analysis of 9 RCTs concluded vitamin B6 up to 100 mg/day improved overall premenstrual symptoms and depressive symptoms specifically. Cap at 100 mg — higher doses cause peripheral neuropathy. Effect modest but consistent.

Chasteberry (Vitex agnus-castus), 20 mg Daily Standardized Extract

Multiple German RCTs of Ze 440 chasteberry extract have shown reduced PMS and PMDD symptom scores versus placebo. The 2003 Schellenberg trial in 178 women showed Vitex extract was non-inferior to fluoxetine for PMDD physical symptoms (though fluoxetine was better for mood). See chasteberry piece.

Magnesium, 200 mg Elemental Daily — Luteal Phase

Magnesium has small trial signal in PMS, particularly during luteal phase. Reasonable adjunct.

St. John's Wort, 900 mg Daily — Mild PMDD Only

One RCT in 36 women with mild-to-moderate PMS showed St. John's Wort 900 mg daily improved mood symptoms versus placebo. Use only in adults not on hormonal contraception (CYP3A4 induction reduces OC efficacy) and not on any SSRI/SNRI. See our drug interactions piece.

What NOT to Take

Avoid evening primrose oil — pooled trial data is null for PMDD. Skip "hormonal balance" megaformulas with subclinical doses. Avoid DHEA — converts to androgens. Don't replace SSRI or COC therapy in severe PMDD with supplements alone. Avoid combining St. John's Wort with hormonal contraception — reduced efficacy.

How to Run the Protocol

Confirm PMDD diagnosis with daily symptom rating over 2 cycles. Layer calcium 1,200 mg + B6 50 mg daily continuous. Add chasteberry 20 mg standardized extract daily for 3 cycles. Magnesium during luteal phase. If inadequate, OB/GYN or psychiatry consult re: SSRI (continuous or luteal phase) or COC. Diet, exercise, and sleep hygiene reduce symptoms independent of any supplement. See PMDD condition page.