New evidence
A meta-analysis linked iron supplements to a moderate reduction in anxiety (d=0.34) in non-anemic people with low iron — but the effect vanished for depression and attention.
This is the first rigorous meta-analysis on iron for anxiety in non-anemic yet iron-deficient individuals, so the finding is novel and plausible, but it rests on a single early synthesis and needs replication before you change your supplement routine.
Researchers pooled data from 1,408 participants across multiple trials and found that taking iron improved anxiety symptoms by a modest but statistically significant amount, while also helping with fatigue, cognitive function, and short-term memory. However, iron did not budge depression or attention span, suggesting its brain benefits are specific — and the results apply only to people who are iron-deficient but not yet anemic.
Where this fits in the evidence
This is among the first studies we've indexed on Iron for Reduced Anxiety — treat it as an early signal until more research accumulates.
The study
- Meta-Analysis
- n = 1,408
- 2025-11
- Neuroscience and biobehavioral reviews
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.