Magnesium glycinate (300-400mg) for sleep/anxiety/cramps. Black cohosh (20-40mg) reduces hot flashes by ~26%. Vitamin D (2,000-5,000 IU) for bone density. Ashwagandha for cortisol/stress. Start there before trying everything on the shelf.
Perimenopause usually hits between 40 and 55. Estrogen starts its chaotic decline. Hot flashes, night sweats, brain fog, mood swings, weight gain around the middle. Fun stuff. Doctors often jump straight to HRT. And HRT works. But if you want to try supplements first (or alongside HRT), some actually have decent evidence. Most don't. Here's the honest breakdown.
Magnesium: Covers Multiple Symptoms at Once
Magnesium glycinate at 300-400mg daily helps with sleep, anxiety, and muscle cramps, three of the most common perimenopause complaints. It won't touch hot flashes directly, but fixing magnesium deficiency (common in women 40+) improves the symptoms that make perimenopause feel worse.
Take it before bed. The glycinate form has a calming effect. Most women notice sleep improvement within 1-2 weeks. That alone can make everything else more tolerable.
Black Cohosh: The Hot Flash Herb
Black cohosh is the most studied herb for hot flashes, with some trials showing 26% reduction in hot flash frequency. The German health authority (Commission E) actually approved it for menopausal symptoms.
Dose: 20-40mg standardized extract, twice daily. Give it 4-8 weeks. It doesn't work for everyone. Maybe 40-50% of women get meaningful relief. But when it works, it works well.
Safety note: rare liver injury reports exist. Get liver enzymes checked if you plan to use it long-term. Not ideal if you have a history of liver problems.
What Else Has Evidence (and What Doesn't)
Vitamin D + Calcium: bone density drops accelerate during perimenopause. 2,000-5,000 IU D3 plus adequate calcium (food-first, supplement if needed) is genuinely important. This isn't optional.
Omega-3 (2g EPA/DHA): some evidence for mood stability and joint stiffness that shows up in perimenopause.
Ashwagandha (300-600mg KSM-66): helps with the cortisol spike that many perimenopausal women experience. Better sleep, less anxiety.
What probably doesn't help: evening primrose oil (weak evidence for hot flashes), soy isoflavones (inconsistent results), dong quai (barely studied in Western trials).
Start with magnesium and vitamin D. Add black cohosh if hot flashes are your main issue. Ashwagandha if anxiety and sleep are worse. And talk to your doctor about HRT. Supplements can help, but they're not a replacement for medical care during this transition.
Every ingredient named here has its own evidence page.
This content is for informational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting any supplement regimen, especially if you have medical conditions or take medications. IngredientMD does not endorse any specific products.