Does magnesium help with hot flashes?
Short answer
The evidence is limited and mixed. No study is strong enough to show magnesium works for hot flashes.
Magnesium is still an essential nutrient, with 320 mg a day recommended for women over 30.
What research has found
Magnesium is involved in muscle, nerve and sleep-related processes, which is why women ask about it. For hot flashes, the studies are few, small and inconsistent. Some women in trials reported fewer hot flashes, and other studies did not find a clear difference from placebo.
Major nonhormone treatment reviews focus on other options for hot flashes. So the honest answer is: it is not proven, and it is not ruled out. If you try it, treat it as a small experiment, not a plan.
Women with a poor diet or heavy use of certain medicines may be low in magnesium, and a doctor can check this with you. Fixing a real shortfall is a good reason to supplement. Hoping it will stop hot flashes is not a strong one.
How much magnesium is reasonable
Women over 30 are advised to get 320 mg a day from food and supplements. Good food sources include pumpkin seeds, almonds, spinach, black beans and whole grains.
The upper limit for magnesium from supplements is 350 mg a day. Higher amounts can cause diarrhea and stomach cramps. Women with kidney disease should ask a doctor first, and magnesium can interact with some antibiotics and heart or bone medicines.
If you try magnesium for a few weeks, note your hot flashes before and after. A simple tally of how many you have on a typical day tells you more than memory does.
What else is studied for hot flashes
Better-studied options include cognitive behavioral therapy, clinical hypnosis and prescription treatments a doctor can discuss. Botanical ingredients such as black cohosh, soy isoflavones, red clover and sage leaf have also been studied, with mixed results. Our hot flash relief page walks through the options.
Ask a doctor if hot flashes are frequent, wake you at night, or come with new symptoms such as palpitations.
Sources
- National Institutes of Health, Office of Dietary Supplements, magnesium fact sheet: recommended intake of 320 mg for women over 30 and the 350 mg supplemental upper limit.
- The Menopause Society, 2023 nonhormone therapy position statement, Menopause journal: review of nonhormone options for vasomotor symptoms, including cognitive behavioral therapy and clinical hypnosis.
Related questions
The nutrients most often discussed for menopause are vitamin D, calcium and magnesium. Vitamin D and calcium are linked to bone health, but no vitamin has been shown to stop hot flashes.
Natural options for hot flashes include dressing in layers, cooling your room and avoiding triggers. Cognitive behavioral therapy is another option, while botanicals like black cohosh have mixed results.
Cool water is the best-supported drink for hot flashes: it helps you cool down and stay hydrated. No drink has been proven to reduce how often they happen, and caffeine and alcohol are triggers for some.