PMS and PMDD: calcium, chasteberry and what else has trials

1. 

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   Calcium (carbonate or citrate)

   The cheapest option with a large trial behind it for mood, bloating, cravings and pain before a period.

   What the research shows: In 466 women with moderate to severe PMS, calcium cut total symptom scores by 48% from baseline by the third month, against 30% with placebo. All four symptom groups (mood, water retention, food cravings and pain) improved. One large trial plus smaller ones; graded B. (PMID 9731851)

   • Adult upper limit: 2,500 mg a day from all sources for ages 19–50 (NIH Office of Dietary Supplements). Count the calcium you already get from food too.
   • Calcium carbonate can cause constipation and gas. Separate calcium from thyroid hormone, iron and some antibiotics by at least 4 hours.
   • History of kidney stones: ask first.

   In the studies

   • The 1998 trial gave 1,200 mg of elemental calcium a day as calcium carbonate for three menstrual periods.

   A record of what researchers gave, in whom; not a dose for you.

   EvidenceBmoderate (Grade B)

   Quick pick · Momentous

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   Momentous Calcium, 60 capsules

   1 capsule: 250 mg calcium (as dicalcium malate, Albion DimaCal); 60 servings

   $16.99price checked Oct 19, 2026 on Momentous’ site

   One-time

   $16.99

   Subscription

   $12.74

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   Also from our partners

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   • 

     Better CalciumOrganics Ocean

     2 capsules: 500 mg calcium from Aquamin red algae, with 10 mcg vitamin D3 and 10 mcg vitamin K2 (MK-7); the low end of the 500–2,000 mg/day studied; 30 servings. An independent lab test (Lead Safe Mama, July 2025) found lead and cadmium in this brand's magnesium glycinate product.

     $35checked Oct 11, 2026 on Organics Ocean’s site

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   Subscribe & save 25%. Pick “Subscribe 25% Off” on the product page; delivery every 1, 2 or 3 months; cancel or reschedule anytime.

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   • Our Momentous links apply the brand’s ambassador discount at checkout, so there is no code to type. Momentous sets any discount it applies; check the cart total before you pay.
   • Offer terms from Momentous’ site, checked Oct 8, 2026. Offers can change; the brand's checkout is final.
2. 

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   Chasteberry (Vitex agnus-castus) extract

   Best for breast tenderness, irritability and mood swings before a period.

   What the research shows: A 2019 meta-analysis of double-blind trials found women on chasteberry were about 2.6 times as likely to have their PMS go into remission as women on placebo, but only 3 of 21 trials met reporting standards, and placebo responses were large. Graded B. (PMID 31780016, PMID 23022391)

   • Not for use in pregnancy, while breastfeeding or with hormonal contraception or fertility treatment, because it acts on pituitary hormones. Ask first if you have a hormone-sensitive condition.
   • May interact with dopamine-acting medicines (some antipsychotics and Parkinson’s medicines).
   • Mild stomach upset, headache and acne have been reported.

   In the studies

   • Trials gave a standardized extract once a day; the dose-finding trial gave 8, 20 or 30 mg of the Ze 440 extract a day for three menstrual periods.

   A record of what researchers gave, in whom; not a dose for you.

   EvidenceBmoderate (Grade B)

   Quick pick · HerbsPro

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   Nature's Answer Chasteberry Vitex Agnus-Castus, 90 Veg Caps

   1 capsule: 200 mg chaste tree (Vitex agnus-castus) fruit extract plus 200 mg chaste tree fruit

   $12.74price checked Oct 15, 2026 on HerbsPro’s site

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3. 

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   Standardized saffron extract

   Optional. Most useful when low mood and irritability lead the picture.

   What the research shows: A 2026 meta-analysis found saffron improved PMS symptoms (SMD −0.64) and period pain (SMD −0.51) versus control. The trials were small and mostly from Iran. (PMID 41151539, PMID 18271889)

   • Use standardized extracts at studied amounts only; high doses of saffron are unsafe in pregnancy.
   • Ask first if you take an antidepressant, blood thinners or blood-pressure medicines, or have bipolar disorder.

   In the studies

   • Trials in the 2026 meta-analysis gave 28–90 mg of saffron extract a day; the earliest PMS trial gave 15 mg twice a day for two months.

   A record of what researchers gave, in whom; not a dose for you.

   EvidenceBmoderate (Grade B)

   Quick pick · Botanic Choice

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   Botanic Choice Saffron, 30 vege capsules

   1 vege capsule: 30 mg saffron extract (min. 0.3% safranal); label directions 1 capsule daily

   $14price checked Oct 12, 2026 on Botanic Choice’s site

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   Also from our partners

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   • 

     NOW Foods Saffron, 50 mg, 60 Veg CapsHerbsPro

     1 veg capsule: 50 mg saffron stigma extract (standardized to min. 10% total crocins)

     $21.24checked Oct 14, 2026 on HerbsPro’s site

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4. 04Optional

   Vitamin B6 (pyridoxine)

   Optional. Old trials, mixed quality; the amounts used come close to the upper limit.

   What the research shows: A 1999 systematic review of 9 trials (940 women) found women were more likely to report overall improvement with B6 (odds ratio 2.32) and depressive symptoms improved, but the trials were small and of poor quality. (PMID 10334745)

   • Adult upper limit: 100 mg a day from all sources (NIH Office of Dietary Supplements). Long-term high-dose B6 can cause nerve damage, with tingling or numbness in the hands and feet; stop and see a clinician if that happens.

   In the studies

   • Trials in the 1999 systematic review gave up to 100 mg of vitamin B6 a day.

   A record of what researchers gave, in whom; not a dose for you.

   EvidenceClimited (Grade C)

   What to look for on the label

   Vitamin B6 as pyridoxine hydrochloride or P5P, at a modest amount per tablet. Check every other product you take for added B6.

   We only name brands we have vetted and work with; a specific pick will appear here once one is approved.

Listed picks above total $43.73 at one-time prices on the brands' own sites; most hold about a month of servings at the label's serving size.