What is saffron? A plain-English guide to saffron supplements

Saffron is a widely used cooking spice [8]. US rules for food colors define saffron as the dried stigmas of the Crocus sativus flower [10]. A stigma is the thin thread in the middle of a flower that catches pollen.

A 2026 review says cooking amounts are usually below 30 mg a day, while supplement studies mostly use 15 to 100 mg [8].

The trials below tested an extract, not the kitchen spice. An extract is a concentrated form made from the plant. The same review says products differ a lot in type, preparation and how they report active parts [8].

A 2014 review, based mostly on lab and animal studies, proposed that saffron may act on serotonin and on inflammation [7]. Serotonin is a brain chemical linked to mood. This is a theory, not proof.

Researchers have studied saffron for mood, anxiety and sleep [3][6]. Many of these trials were in people with a health condition, not in healthy adults [3][6].

As of November 11, 2026 we found no randomized trials of saffron alone on memory and thinking in healthy adults (PubMed and Europe PMC searches).

A placebo is a dummy pill with nothing active in it. The four single trials below were randomized and double-blind: chance decided who got saffron or placebo, and neither the people nor the researchers knew which [1][2][4][5].

Does saffron help with mood?

Evidence grade for mood: C, limited. Why this grade

Evidence is mixed in adults without a diagnosis. The largest trial was funded by Pharmactive, and two authors work there [1]. In it, 202 adults aged 18-70 with low mood took 28 mg of extract a day or a placebo for 12 weeks [1].

The saffron group improved more on a self-rated score for low mood [1]. The trial found no clear differences between groups on its other scores, and people on the placebo also improved a lot [1].

A smaller 6-week trial in 51 healthy adults with mild low mood was publicly funded, though two authors are linked to Activ'Inside [2]. In it, saffron did not clearly improve mood, anxiety or tiredness scores more than a placebo [2].

A 2026 meta-analysis pooled 34 trials with 1,769 adults [3]. A meta-analysis combines the results of many trials on one question. It found lower scores on one self-rated mood scale, but the trials disagreed a lot [3]. It found no clear effect on scales scored by a clinician [3]. The trials covered depression, anxiety and mood disorders, so results may not apply to healthy adults [3].

Does saffron help with sleep?

Evidence grade for sleep quality: B, moderate. Why this grade

In a 28-day trial funded by Pharmactive, 63 healthy adults with poor sleep took 14 mg of extract twice a day or a placebo [4]. Based on data from 55 of them, the saffron group's self-rated sleep scores improved more than the placebo group's [4].

In a 4-week trial funded by Activ'Inside, 165 adults who reported moderate insomnia took 20 mg or 30 mg of extract, or a placebo [5]. Among the 150 people who finished, sleep problem scores fell more with saffron than with the placebo [5]. Most other measures showed no clear difference [5].

A 2022 meta-analysis found better scores on a standard sleep questionnaire with saffron than with a placebo [6]. It mixed healthy adults with people who had sleep or health conditions, so results may not apply to healthy adults [6].

Does saffron help with stress?

Evidence grade for perceived stress: C, limited. Why this grade

Evidence is mixed. In the 165-person insomnia trial funded by Activ'Inside, self-rated stress fell more with 20 mg or 30 mg than with a placebo [5]. This was a side result of that trial, not its main question [5].

In the publicly funded 6-week trial with two authors linked to Activ'Inside, saffron did not clearly lower anxiety scores more than a placebo [2]. In the same 2026 meta-analysis, one self-rated anxiety scale fell with saffron, but the trials disagreed a lot [3]. It found no clear effect on an anxiety scale scored by a clinician [3].

Read how we grade evidence to see what each grade means.

Table: Doses used in studies (not a recommendation)

These are amounts used in research, not advice. Products vary, so an amount from one study may not match another product [8].

A 2026 review of 102 trials and one case report put the rate of side effects at around 17.5% [8]. The most common were stomach and gut problems, which were mostly minor and went away on their own [8].

The same review found no clear pattern of side effects building up with use for up to 12 months [8]. But it said clinical checks should be considered at higher doses or with long use, as some side effects could be serious [8].

The review describes one case of bleeding in a person who took saffron with a blood thinner, rivaroxaban [8]. The bleeding stopped when both were stopped [8].

Talk to a clinician or pharmacist before trying saffron supplements, especially if you take any medicines.

The 2026 review urges care for four groups [8]:

• Older adults, because of changes in how the body handles drugs, other illnesses and many medicines [8].
• People who take blood thinners, such as rivaroxaban, because of a risk of more bleeding [8].
• People with a mental health condition, who may be more likely to have side effects that affect the mind [8].
• Pregnant and breastfeeding women, because there is little safety data [8].

If you take any of these medicines, talk to your doctor or pharmacist before combining them with saffron.

A 2026 review of saffron in pregnancy links higher doses, or exposure at work, with stimulating the womb and a higher risk of miscarriage [9]. It says long-term safety data are still needed [9].