30 mg/day of standardized extract (safranal/crocin).
Large effect (g ≈ 0.99) — on par with fluoxetine in trials
View the study (meta-analysis) →Anxiety and mood — large effect, still to be confirmed at large scale
View the study (meta-analysis) →⏱ 3 min read
Saffron is the most expensive spice in the world (each thread is the dried stigma of a flower harvested by hand once a year), but beyond its culinary use in rice dishes and paellas, the last twenty years have revealed a surprisingly robust pharmacological profile in psychiatry: several well-designed randomized trials have shown antidepressant effects comparable to fluoxetine and imipramine in mild to moderate depression, with low doses and a very favorable adverse-effect profile.
The most relevant active compounds are crocin, crocetin, picrocrocin, and safranal, a family of carotenoids and monoterpenes responsible for the intense yellow color, the characteristic bitter taste, and a good part of the documented biological activity; standardized extracts (typically affron® or saffr'activ™) are those used in the clinical trials with the best results and the ones worth looking for among commercial products.
Several meta-analyses of randomized trials have shown that doses of 30 milligrams daily of standardized saffron extract (typically affron® at 28 mg/day or equivalent) for 6-8 weeks produce reductions on the Hamilton depression scale comparable to those of fluoxetine, imipramine, and citalopram in people with mild to moderate depression, with a significantly more favorable adverse-effect profile than pharmacological antidepressants.
The most plausible mechanism combines serotonergic modulation (an effect similar to but milder than that of SSRIs, with less receptor saturation), dopaminergic modulation, and a direct antioxidant effect on brain tissue; this multimodal profile explains why the clinical response is faster than that of SSRIs (some patients notice improvement in 1-2 weeks vs 4-6 weeks) and why the tolerability profile is so favorable.
In anxiety associated with depression, the same trials that show an antidepressant effect document significant reductions on anxiety scales (Hamilton Anxiety, BAI) with the same dosing regimen; in people with subclinical anxiety or everyday stress, several small studies have shown improvements in subjective well-being, sleep quality, and sense of calm with 28-30 mg/day over several weeks.
In age-related macular degeneration (AMD) in its early stages, several Italian trials have shown modest but significant improvements in contrast sensitivity and macular function with 20 milligrams of saffron daily for 3-6 months, an effect attributed to specific antioxidant protection of the photoreceptors and to improved choroidal blood flow; these data are interesting but must be confirmed in larger studies.
In premenstrual syndrome, several studies have shown significant reductions in affective and somatic symptoms with 30 milligrams daily for 2 menstrual cycles; in mild erectile dysfunction, some small trials show modest effects; in mild cognitive impairment and early Alzheimer's, the data are preliminary but point to a neuroprotective effect that justifies further research.
The doses studied range from 14 to 30 milligrams daily of standardized extract, ideally divided into one or two doses with or without food; branded products with clinical backing (affron®, saffr'activ™) are the best supported, while whole culinary saffron threads do not reach therapeutic doses without prohibitive cost (you would need several grams a day to match the 30 mg of extract).
Generally very well tolerated at the doses studied; the most frequent adverse effects are mild (dry mouth, drowsiness, occasionally headache); the toxic dose is around 5 grams daily of pure saffron (far from any reasonable clinical use) and abortifacient doses begin at 10 grams in pregnant women, which makes it prudent to avoid it in pregnancy, breastfeeding, and bipolar disorder, where the antidepressant effect could precipitate manic episodes as happens with other antidepressants.
Information, not medical advice. Scientific evidence reflects the quality of the studies.