PMS (Premenstrual Syndrome): The Evidence-Based Supplement Protocol

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Premenstrual syndrome — the broader cluster of physical and mood symptoms before menses — affects ~75% of menstruating women in milder forms. PMDD is the severe DSM-5 variant (see separate protocol). For typical PMS, lifestyle and supplements often suffice without pharmacotherapy.

Calcium Carbonate, 1,200 mg Daily

Calcium has the strongest supplement evidence in PMS. The 1998 Thys-Jacobs RCT in 466 women showed calcium carbonate 1,200 mg/day reduced overall PMS symptom score by 48% over 3 cycles versus 30% placebo response. Effect on water retention, food cravings, mood, and pain were all significant. See calcium piece.

Magnesium, 200–360 mg Elemental Daily

Multiple small RCTs show magnesium reduces water retention, breast tenderness, and mood symptoms in PMS. Effect modest but consistent. Glycinate or citrate forms. See magnesium glycinate piece.

Vitamin B6, 50–100 mg Daily

The 1999 BMJ meta-analysis of 9 RCTs concluded vitamin B6 improved overall PMS symptoms and depressive symptoms specifically. Cap at 100 mg/day.

Chasteberry (Vitex), 20 mg Daily

Vitex has positive PMS trial data including the Schellenberg 2001 BMJ trial showing significant symptom reduction versus placebo. Most useful for breast tenderness and irritability. See chasteberry piece.

Saffron, 30 mg Daily — Mood-Dominant PMS

A 2008 Iranian RCT in 50 women with PMS showed saffron 30 mg daily improved Hamilton Depression and Premenstrual Daily Symptoms scores versus placebo. See saffron piece.

What NOT to Take

Avoid evening primrose oil — Cochrane null for PMS. Avoid "menstrual support" megaformulas with 10+ subclinical-dose ingredients. Skip diuretic supplements ("water pill" formulas) — sodium reduction is more effective and safer. Don't combine multiple herbal hormone modulators (Vitex + dong quai + black cohosh + soy) — interactions unclear.

How to Run the Protocol

Track symptoms daily over 2 cycles to confirm PMS pattern. Layer calcium 1,200 mg + magnesium 200 mg + B6 50 mg daily continuous. Add chasteberry 20 mg standardized extract for 3 cycles. Add saffron 30 mg if mood symptoms dominate. Diet (low sodium, low refined carb), regular aerobic exercise, and sleep hygiene reduce PMS symptoms independent of supplements. If severe symptoms persist (PMDD criteria), see separate PMDD protocol.