Traditional use
Cultivated across Iran, Kashmir, Greece, Spain and Morocco, with Iran producing the large majority of the world supply. Used as a culinary spice and colouring, and historically in perfume and dye. In Persian and Ayurvedic practice it was given for low mood and digestive complaints — the use that modern trials have most often examined.
What the evidence shows
Saffron has more clinical trial evidence behind it than almost any culinary spice, and it is concentrated in one area: mood.
A meta-analysis of randomised trials found saffron effective in mild to moderate depression [2]. A later meta-analysis compared it directly against SSRIs across eight head-to-head randomised trials and found no statistically significant difference between them in reducing depressive symptoms [1].
Read that carefully. “No significant difference” is not the same as “as good as an antidepressant.” The trials are small, most originate from a single country, and a non-significant difference between two groups is weak evidence of equivalence rather than proof of it. What can be said fairly is that the mood effect has survived repeated testing — which is more than most herbs manage.
Outside mood, the evidence for saffron is preliminary.
Composition
Three compounds define saffron, and each carries one of its properties:
- Crocin — the crocetin glycosides responsible for the colour
- Picrocrocin — the bitter taste
- Safranal — the aroma, formed as picrocrocin breaks down during drying
Saffron is an autotriploid and therefore sterile, propagated only by division of its corms — every plant is a clone. Genetic and archaeological evidence places its origin in Attica, Greece, where it arose from wild Crocus cartwrightianus [3]. Each flower yields three stigmas, picked by hand, which is why roughly 150,000 flowers are needed for a kilogram of dried spice.
How it is prepared
Stigmas are steeped, not boiled. A pinch is soaked in warm water, milk or stock for 10–20 minutes until the liquid turns deep orange, then the infusion and the threads are added to the dish. Grinding first releases more colour.
Culinary use is a few threads per dish. The trials of the mood effect have typically used 30 mg per day of standardised extract — far above culinary exposure, and a different thing entirely.
Cautions and interactions
Culinary amounts are unproblematic. Supplemental doses require more care.
A systematic review of 102 clinical trials put the incidence of adverse events at around 17.5%, most commonly gastrointestinal, generally minor and self-limiting [4]. Saffron was well tolerated in a formal safety evaluation in healthy volunteers [5].
Avoid supplemental doses in pregnancy. High doses carry a long traditional reputation as an abortifacient, and there is no safety data supporting their use.
If you take an antidepressant, do not add a saffron supplement without telling the doctor who prescribed it. The trials above tested saffron as a replacement for an SSRI, not alongside one.
Sources
- Shafiee, A., Jafarabady, K., Seighali, N., et al. (2025). “Effect of saffron versus selective serotonin reuptake inhibitors (SSRIs) in treatment of depression and anxiety: a meta-analysis of randomized controlled trials.” Nutrition Reviews, 83(3), e751–e761. doi:10.1093/nutrit/nuae076
- Tóth, B., Hegyi, P., Lantos, T., et al. (2019). “The efficacy of saffron in the treatment of mild to moderate depression: a meta-analysis.” Planta Medica, 85(1), 24–31. doi:10.1055/a-0660-9565
- Nemati, Z., Harpke, D., Gemicioglu, A., Kerndorff, H., & Blattner, F. R. (2019). “Saffron (Crocus sativus) is an autotriploid that evolved in Attica (Greece) from wild Crocus cartwrightianus.” Molecular Phylogenetics and Evolution, 136, 14–20. doi:10.1016/j.ympev.2019.03.022
- Hasheminasab, F. S., Hajimonfarednejad, M., Najibi, S. M., & Hashempur, M. H. (2026). “Adverse events of saffron (Crocus sativus L.): systematic review of current evidence.” Health Science Reports, 9(5), e72212. doi:10.1002/hsr2.72212
- Modaghegh, M. H., Shahabian, M., Esmaeili, H. A., Rajbai, O., & Hosseinzadeh, H. (2008). “Safety evaluation of saffron (Crocus sativus) tablets in healthy volunteers.” Phytomedicine, 15(12), 1032–1037. doi:10.1016/j.phymed.2008.06.003