Several vitamins have clinical evidence linking them to reduced night sweats, with vitamin E, vitamin B6, and vitamin B12 showing the strongest connections. Most research focuses on menopause-related night sweats, but some nutrient deficiencies can trigger drenching sweats on their own, regardless of hormonal status.
Vitamin E
Vitamin E is the most studied vitamin for night sweats and hot flashes. Multiple clinical trials have tested 400 IU per day in postmenopausal women and found it significantly reduced both the intensity and frequency of hot flashes compared to placebo. In one double-blind trial, 51 postmenopausal women took a placebo for four weeks followed by 400 IU of vitamin E daily for four weeks, and the reduction in hot flash severity was meaningfully greater during the vitamin E phase. A separate eight-week trial of 29 women confirmed the same benefit at the same dose.
A systematic review published in the journal Nutrients looked across all available studies and found that every assessed trial showed a positive effect on menopausal vasomotor symptoms, the clinical term for hot flashes and night sweats. Some trials used vitamin E alongside other compounds like soy isoflavones, which makes it harder to isolate the vitamin’s contribution, but the standalone trials at 400 IU still showed clear benefits.
One important safety note: vitamin E can thin the blood by inhibiting platelet clumping and interfering with clotting factors. The tolerable upper limit set by the National Institutes of Health is 1,000 mg per day for adults, well above the 400 IU used in trials. But if you take blood thinners like warfarin, doses above 400 IU may increase bleeding risk, especially if your vitamin K intake is low.
Vitamin B12
Vitamin B12 deficiency is a direct, treatable cause of night sweats. B12 plays a role in the autonomic nervous system, which controls involuntary functions like sweating, heart rate, and body temperature. When B12 drops low enough, it can cause autonomic dysfunction that manifests as drenching night sweats. A case series published in PubMed documented three patients whose severe night sweats were traced to B12 deficiency, and all three responded dramatically to B12 replacement therapy.
B12 deficiency is surprisingly common, particularly in adults over 50, vegetarians, vegans, and people taking acid-reducing medications. If your night sweats came on gradually and you fall into one of those groups, a simple blood test can rule this in or out. Unlike vitamin E, which modestly reduces hormonally driven sweats, correcting a B12 deficiency can eliminate night sweats entirely when that deficiency is the root cause.
Vitamin B6
Higher dietary intake of vitamin B6 is linked to less severe hot flashes in middle-aged women. A study that adjusted for age, body mass index, and menopausal status found that for every 10 microgram increase in B6 intake per unit of energy consumed, the odds of severe hot flashes dropped by 8%. Oily fish, one of the best dietary sources of B6, showed a particularly strong inverse relationship with hot flash severity.
B6 helps the body metabolize estrogen and supports the production of neurotransmitters that regulate body temperature. While no trials have tested B6 supplements specifically for night sweats, the observational data suggest that getting adequate B6 through diet, especially from fatty fish like salmon, mackerel, and sardines, may help keep symptoms milder.
Vitamin D
Vitamin D often appears in lists of supplements for menopause symptoms, but the evidence for night sweats specifically is weak. The Women’s Health Initiative, one of the largest clinical trials ever conducted in postmenopausal women, tested calcium and vitamin D supplementation and found no significant effect on night sweats. The p-value for night sweats was 0.89, meaning the supplement group and placebo group were statistically identical.
The researchers noted a possible explanation: the trial used only 400 IU of vitamin D3 daily, which would raise blood levels by roughly 4 ng/mL. That may not have been enough to make a clinical difference, particularly in women who were already deficient. Still, with the current evidence, vitamin D is not a reliable intervention for night sweats on its own. It’s worth maintaining healthy levels for bone health and immune function, but don’t expect it to stop you from waking up soaked.
Magnesium as a Supporting Mineral
Magnesium isn’t a vitamin, but it comes up often alongside vitamin recommendations for night sweats because of its role in sleep quality. Poor sleep and night sweats feed each other in a cycle: sweating disrupts sleep, and poor sleep quality can worsen the body’s temperature regulation. A clinical trial found that 500 mg of elemental magnesium daily for eight weeks significantly increased sleep duration and helped people fall asleep faster.
Magnesium also helps regulate the nervous system and muscle relaxation, both of which play into how the body manages temperature overnight. While it won’t directly stop a hormonally driven sweat episode, better sleep quality can reduce how disruptive those episodes feel. Magnesium glycinate is the form most commonly recommended for sleep because it’s well absorbed and less likely to cause digestive side effects than other forms like magnesium oxide.
When Night Sweats Signal Something Else
Vitamin deficiencies and hormonal changes account for most night sweats, but some patterns point to conditions that supplements won’t fix. Night sweats paired with unexplained weight loss, persistent fevers, a cough that won’t go away (especially with blood), swollen lymph nodes in the neck or armpits, unexplained rashes, or easy bruising can indicate infections, autoimmune conditions, or certain cancers like lymphoma. These combinations warrant a medical workup rather than a trip to the supplement aisle.
Certain medications, particularly antidepressants, hormone therapies, and blood sugar-lowering drugs, can also cause night sweats as a side effect. If your night sweats started shortly after beginning a new medication, that timing is worth discussing with whoever prescribed it.
A Practical Starting Point
If your night sweats are linked to menopause, vitamin E at 400 IU daily has the best clinical backing. Adding B6-rich foods like oily fish and maintaining adequate magnesium may help as well. If you’re not in menopause, or if your sweats are unusually severe, checking your B12 level is a straightforward first step that can occasionally solve the problem completely. Vitamin D is worth maintaining at healthy levels for general health, but the current evidence doesn’t support it as a targeted remedy for night sweats.