Educational information, not medical advice — ask your doctor or midwife.
Saffron is the dried red thread of the crocus flower, Crocus sativus. It is used as a cooking spice, and also sold in capsules for low mood. Each flower gives only three threads, which is why it costs so much.
In the kitchen it colours and flavours rice, soup and sweets. The taste is bitter and honey-like. A pinch is enough for a whole pot.
As a supplement it is sold mainly for mild low mood, for PMS, and for eye health in older adults. Most products are standard extracts in a 28 to 30 mg capsule.
Here is the honest verdict on the evidence. Small human trials point to a modest effect on mild to moderate low mood over several weeks. Most of these trials are short, small, and run by a few research groups, so the finding is not settled.
Saffron has a long and well recorded history in medicine and cooking. Long use is not proof that it works, and it is not proof that it is safe.
No one has shown how saffron acts in the human brain. The mechanism below is proposed, not proven.
In animal and cell studies, two saffron compounds seem to raise levels of serotonin and dopamine. These are brain chemicals linked to mood. Whether this happens at supplement doses in people is not established.
In test tubes, saffron extracts mop up free radicals, which are unstable molecules that damage cells. In animal eye studies, crocin appears to protect the light-sensing cells at the back of the eye.
In laboratory work, crocin also slows blood platelets from clumping. Platelets are the cells that help blood clot. That lab finding is the reason for caution with blood thinners, not proof of a real bleeding effect in people.
So the short answer is this. The lab story is interesting and consistent. It is not the same as a proven effect in the body.
You can buy saffron in several forms.
- Whole dried threads, the usual cooking form. - Ground powder, which is easier to fake than threads. - Capsules of standard extract, often sold under brand names for mood.
- Eye supplements that mix saffron with lutein and zeaxanthin. - Tinctures and teas, which are less common.
Threads are usually soaked in warm water or milk, then added with the soaking liquid. Supplements are swallowed as capsules.
Quality varies a lot. Look for a named grade or a stated crocin content on the label.
Saffron is one of the oldest recorded spices. Wall paintings on the Greek island of Santorini show saffron harvest from around 1600 BCE.
Greek and Roman writers listed it for pain, sleep and stomach complaints. Persian and Unani doctors used it for low spirits and for the heart. Ayurvedic and Tibetan texts used it in tonics and in eye formulas.
In Chinese medicine the threads are called xi hong hua and were used for blood and mood complaints. In medieval Europe it was used as a dye, a scent and a medicine, and faking it could be a crime.
These records show that people valued it. They do not tell us whether it worked.
Stop and speak to a doctor if you notice any of the following.
- Easy bruising, nosebleeds, or bleeding that will not stop. - Yellow skin or yellow eyes. - Repeated vomiting or blood in vomit or stool. - A rash, swelling of the face, or wheezing. - Low mood that gets worse, or any thought of harming yourself.
If you have thoughts of suicide, seek help the same day from a doctor or a crisis line. If someone has swallowed a large amount of saffron, treat it as poisoning and call emergency services.
In the UK, the EU and the US, saffron is an ordinary food spice and may also be sold as a food supplement. It is not approved as a medicine for any condition, and sellers may not claim it treats depression or eye disease.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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