Saffron extract

What it is

Saffron is the dried stigma of the Crocus sativus flower, and it is the world's most expensive spice. It is used in cooking and traditional medicine.

Supplement extracts, such as affron and Satiereal, are taken for mood, anxiety, sleep and appetite control. Culinary amounts are much lower than supplement doses.

It is sold as a food supplement in the UK. Evidence has grown in recent years but is still limited.

How it works

Crocin, crocetin and safranal are thought to influence serotonin and other brain chemicals and to have antioxidant effects. How much this matters in people is not settled.

What the evidence says

• Moderate Mild to moderate low mood
  Several small trials and meta-analyses suggest benefits comparable to some antidepressants in short studies, though trials are small and many come from a few research groups.
• Limited Anxiety
  Some trials show reduced anxiety scores; the evidence is smaller than for mood.
• Limited Sleep quality
  A few trials suggest modest improvement in sleep scores.
• Weak Appetite and snacking
  Small studies suggest reduced snacking in some women; effect on weight is small.
• Weak Eye health (age-related macular degeneration)
  Early small studies, not a proven approach.

Evidence ratings are our plain-English summary of how much good human research exists, not a promise of results. How we rate evidence.

Dosage and timing

• Trials commonly use about 28 to 30 mg daily of extract, often as 14 or 15 mg twice a day.
• Take with or without food.
• Do not exceed label doses; very high intakes (several grams) are considered unsafe.
• There is no NHS reference intake. Check current guidance and the label.

Forms and what to look for

• Standardised stigma extracts (affron, Satiereal) are the ones used in research.
• Whole threads are for cooking and too variable for dosing.
• Check that the product is Crocus sativus stigma and states the extract amount.
• Be wary of very cheap saffron, which is often adulterated.

What to expect, and when

• Trials usually run 4 to 12 weeks.
• Mood effects, if any, tend to appear after a few weeks.
• If you notice nothing after two months, consider stopping.

Side effects

• Nausea, dry mouth or stomach upset.
• Headache or dizziness.
• Drowsiness or, occasionally, anxiety or agitation.
• Allergic reactions in sensitive people.

Interactions

• Antidepressants: possible additive effect on serotonin, so seek advice first.
• Blood pressure medicines: saffron may lower blood pressure.
• Sedatives: possible additive drowsiness.
• Blood thinners: theoretical additive effect.

Who should avoid it

• Pregnant women at supplement doses, as high intakes may stimulate the uterus.
• Breastfeeding.
• People with bipolar disorder, because mood-active herbs may trigger mania.
• Anyone with persistent low mood, who should seek professional help rather than self-treat.
• People taking antidepressants without advice.

Risks and safety

• Saffron is frequently adulterated with dyed plant material, particularly the powder.
• Very high doses are toxic.
• Not WADA-prohibited.

Buying well: quality and testing

• Choose a named, standardised extract with clinical research behind it.
• Look for third-party testing and clear stigma content.
• Avoid unbranded cheap powders.
• Check the dose per capsule matches the trial range.

Bottom line

Saffron extract has a surprisingly reasonable amount of small-trial support for mild low mood and anxiety. It could suit someone who wants an adjunct, but anyone with persistent low mood or on antidepressants should speak to a GP or pharmacist first. Buy a standardised, tested extract rather than the spice.