The more I read into it, the more I wonder why people aren’t talking about this one much.
From Claude AI
Depression
The evidence here is fairly strong. A 2024 systematic review of 46 randomized controlled trials found saffron was more effective than placebo in improving depression, with an overall effect size of -4.26, and was non-inferior to conventional antidepressant drugs while showing good tolerance.
More recently, a large 12-week placebo-controlled trial in 202 adults with subclinical depression found that saffron was associated with significantly greater reductions in depression scores, with 72.3% of participants in the saffron group achieving a clinically meaningful improvement compared to 54.3% in the placebo group. Notably, participants taking saffron also experienced a 53% drop in low mood symptoms over the three months of supplementation.
Not every study has been positive, though. One smaller 6-week trial in 51 healthy adults with subclinical symptoms found that saffron extract did not significantly affect the primary composite score of depressive, anxiety, and fatigue symptoms, though it did improve self-perceived mental health compared to placebo.
References
https://www.sciencedirect.com/science/article/pii/S0002916525006033
Sleep
The sleep evidence is promising but more conditional. A recent randomized, double-blind, placebo-controlled trial in 165 adults with moderate insomnia found that saffron extract (at both 20 mg and 30 mg doses) significantly reduced insomnia severity compared to placebo, with the most pronounced effects on sleep onset and duration. Sleep quality also improved significantly after 3 weeks.
In the large depression trial, sleep improvements were identified specifically in the subset of participants who had greater baseline sleep disturbance — suggesting saffron may help most those who actually have sleep problems rather than everyone.
References
https://www.sciencedirect.com/science/article/abs/pii/S0022316625003062
Bottom line: The research is encouraging, particularly for mild-to-moderate depression and sleep disturbances.