Research review
Does vitamin D help with anxiety? What the research does and doesn't show
A 2024 analysis of 31 vitamin D3 trials found no significant effect on anxiety symptoms. An older analysis pooled anxiety with depression and was very inconsistent.
Large reviews of randomised trials do not show that vitamin D supplements reduce anxiety. The most recent dose-response analysis, 31 trials of vitamin D3 in 24,189 adults, found no significant effect on anxiety symptoms. An earlier analysis that pooled anxiety with depression found an average effect, but with very high inconsistency between trials.
What the evidence doesn't support
- No evidence that vitamin D3 changes anxiety symptoms. The 2024 analysis of vitamin D3 trials found no significant effect on anxiety.
- No evidence about anxiety disorders. The trials measured symptom scores in adults; none of the reviews below shows an effect of a supplement on a diagnosed anxiety disorder.
- No dose "for anxiety". The analysis tested the effect per 1,000 IU a day and found nothing on anxiety at any dose, so there is no number to quote.
- No evidence for vitamin D plus magnesium, or any other pairing. We found no trial of a combination to cite.
- Personal stories are not trials. A reader's account of a change in their own anxiety is one person's experience. It is not a controlled comparison, and it cannot be separated from time, season, therapy, medication or chance.
What the trials found
Anxiety symptoms: no significant effect
A 2024 systematic review and dose-response meta-analysis in Psychological Medicine pooled 31 randomised trials (24,189 adults) of vitamin D3 and looked at depressive and anxiety symptoms separately. For anxiety symptoms it found no significant effect, and its authors said further high-quality trials are needed before a conclusion can be drawn. The abstract does not break the anxiety result out by dose or by trial count, so we cannot say how many of the 31 trials measured anxiety. Certainty for the anxiety result was not stated in the abstract.
Anxiety and depression pooled: an average effect, with caution
A 2020 meta-analysis in Depression and Anxiety pooled 25 randomised trials (7,534 participants) that measured "negative emotions", which combined depression and anxiety outcomes. It found an average effect of vitamin D over placebo (Hedges' g -0.50, 95% CI -0.85 to -0.15) but with extreme inconsistency between trials (I2 97.7%). The effect was seen in people with major depressive disorder and in people whose blood 25(OH)D was 50 nmol/L or lower, in trials lasting 8 weeks or longer and using 4,000 IU a day or less. The authors urged caution. Because anxiety was pooled with depression, this review does not show an effect on anxiety alone, and it is the 2024 analysis above that separated the two.
The largest single trial did not measure anxiety
VITAL, which gave 2,000 IU a day of vitamin D3 to adults aged 50 and over for a median 5.3 years, reported depression and mood outcomes; we cite no anxiety result from it. In its 18,353 participants without depression at the start it found no effect on depression risk or mood score (hazard ratio 0.97, 95% CI 0.87 to 1.09). That is a result about depression, covered in does vitamin D help with depression?. It does not tell us anything about anxiety.
| Review | What it pooled | Result for anxiety |
|---|---|---|
| Psychological Medicine, 2024 | 31 trials, 24,189 adults, vitamin D3 | No significant effect on anxiety symptoms |
| Depression and Anxiety, 2020 | 25 trials, 7,534 people, anxiety and depression together | Average effect on pooled "negative emotions", very high inconsistency; not an anxiety-only result |
| VITAL-DEP, 2020 | 18,353 adults, 2,000 IU D3, 5.3 years | Depression and mood; no anxiety result cited here |
Questions people ask
Does vitamin D3 help with anxiety?
The most recent analysis that looked at anxiety alone, 31 trials of vitamin D3, found no significant effect on anxiety symptoms. An older analysis that pooled anxiety and depression found an average effect with very inconsistent results. Neither shows that vitamin D reduces anxiety.
Does vitamin D3 help with depression and anxiety together?
The two are different results. For depression, trials disagree: some pooled analyses found a small average effect, while VITAL found none in older adults without depression. For anxiety, the 2024 analysis found none. See does vitamin D help with depression? for the depression evidence and its limits. Pooled results from the 2020 review cannot be split back into the two.
Is vitamin D3 good for anxiety?
The trials do not show that. The nutrient has a job in the body (NIH Office of Dietary Supplements: it helps absorb calcium and phosphorus and is needed for normal bone), but that is separate from whether taking it changes anxiety. See what is vitamin D?.
Can vitamin D3 cause anxiety?
None of the trial reviews above reported anxiety as a side effect. A 2018 clinical review of vitamin D toxicity lists confusion, apathy, recurrent vomiting, abdominal pain, frequent urination, thirst and dehydration, from high blood calcium after excessive intake; anxiety is not on its list. If you feel unwell on a supplement, stop and ask a clinician, since only a blood test shows whether vitamin D is involved. See vitamin D side effects.
What dose of vitamin D3 is used for depression and anxiety?
No dose has been shown to reduce anxiety. In the 2020 review, the pooled effect on negative emotions appeared in trials at 4,000 IU a day or less, lasting at least 8 weeks. That is a description of those trials, not a recommendation. The adult upper limit is 4,000 IU (100 mcg) a day from all sources; see how much vitamin D should you take a day.
Does magnesium glycinate with vitamin D3 help with anxiety?
We found no trial of the combination to cite. The two are covered separately: does magnesium glycinate help with anxiety? and magnesium glycinate with vitamin D3 and K2.
When to talk to a doctor
Anxiety that gets in the way of work, sleep, relationships or daily life deserves an evaluation. Vitamin D is not a treatment for anxiety or any anxiety disorder, and nothing above supports using it in place of care. If you take medication for anxiety, or you are pregnant or nursing, ask a doctor before adding any supplement. If you wonder whether your vitamin D is low, the way to know is a blood test of 25-hydroxyvitamin D, which a clinician can interpret.
Sources
- The effect of vitamin D supplementation on depression: a systematic review and dose-response meta-analysis of randomized controlled trials Across 31 trials of vitamin D3, there was no significant effect on anxiety symptoms and a small, short-term effect on depressive symptoms.
- The effect of vitamin D supplement on negative emotions: A systematic review and meta-analysis Across 25 trials, vitamin D gave an average improvement in pooled depression and anxiety scores, but results varied hugely between trials.
- Effect of Long-term Vitamin D3 Supplementation vs Placebo on Risk of Depression or Clinically Relevant Depressive Symptoms and on Change in Mood Scores: A Randomized Clinical Trial In 18,353 older adults, 2,000 IU a day for about 5 years changed neither depression risk nor mood scores versus placebo.
- Vitamin D Toxicity-A Clinical Perspective Too much vitamin D raises blood calcium, causing nausea, confusion, thirst and frequent urination; it is rare and usually follows very high doses.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.