Saffron

What is saffron?

Saffron is the spice made from the dried red stigmas of the Crocus sativus flower. Each flower yields only three threads, which is why saffron is one of the most expensive spices in the world. Its color and aroma come from compounds called crocin, crocetin, picrocrocin and safranal, and these are the compounds researchers usually standardize supplements to. In supplements, saffron is sold as a powdered stigma or as a concentrated extract in capsules or tablets.

What the research says

Saffron has more human research behind it than most botanicals found in brain and mood formulas, but the trials are small and many come from a handful of research groups in Iran.

Mood

Mood is where the evidence is strongest. A 2013 meta-analysis of five randomized trials in adults with major depressive disorder found a large benefit for saffron over placebo and no clear difference between saffron and standard antidepressants, but the authors asked for larger trials outside Iran before drawing firm conclusions; every included trial used 30 mg per day (Hausenblas et al., 2013). A 2019 meta-analysis of mild to moderate depression reached a similar conclusion (Tóth et al., 2019). The most recent analysis, covering 34 randomized trials and 1,769 adults, found lower scores on self-rated depression and anxiety questionnaires but no significant change on clinician-rated scales, and rated the certainty of evidence as moderate (Mahmoudi et al., 2026). Saffron is not a substitute for treatment of depression, and anyone with persistent low mood should talk with a doctor.

Memory and thinking

The cognitive evidence is much thinner. A 2020 systematic review found only four randomized trials, all in people already diagnosed with mild cognitive impairment or Alzheimer’s disease. Saffron scored better than placebo on some cognitive scales, but the authors concluded there was insufficient evidence to recommend it for clinical use (Ayati et al., 2020). Those trials used 30 mg of extract daily. There is very little research in healthy adults who simply want sharper focus, so claims that saffron improves everyday memory go beyond the data.

Other outcomes

A review of 19 meta-analyses found signals for fasting glucose, waist size, blood pressure and cholesterol, but noted that the reviews themselves were of mixed quality and that larger multinational trials are needed (Lu et al., 2021).

How it’s used in supplements

In mood and brain formulas, saffron is usually included at or below the 30 mg extract dose used in trials. Because extracts differ in how much crocin and safranal they contain, a label that names a standardized extract and a milligram amount is far more useful than one that lists saffron inside an undisclosed blend. Side effects reported in trials were mostly mild: nausea, dry mouth, poor appetite and headache (Lu et al., 2021). Safety of concentrated saffron extract in pregnancy has not been established, so it is best avoided then. People taking antidepressants, blood pressure medicines or blood thinners should ask a doctor before adding it.