Saffron: The Red Threads from the Crocus Flower

1. What Is It, Actually?

Imagine a small flower, the saffron crocus. Inside it are a few red threads. These threads are saffron. When dried, they smell spicy, slightly of honey and hay. Saffron is therefore not a powder from a factory, but something a plant produces itself. Such substances are called natural substances. Natural substances are compounds that occur in plants, animals, or fungi. Researchers refer to the plant by the name Crocus sativus. What matters is this: saffron is not a single substance, but a mixture of many different compounds. Some give the colour, others the scent, and others the flavour. When researchers examine what saffron does, they are usually investigating this entire mixture. They also look at different parts of the plant: the red threads and the petals. Both have been used in studies.

2. Where Does It Come From?

Saffron comes from the flower of the saffron crocus. The red threads are inside the flower, and they must be removed by hand. Afterward, they are dried, as this is the only way they keep. Each flower contains only a tiny amount. This is why saffron is expensive. If researchers want to examine saffron more closely, they make an extract from it. An extract is like tea: the plant parts are placed in a liquid, and the liquid draws out the compounds. Some studies used an extract from the red threads, others from the petals. For us humans, saffron is primarily a spice.

3. What Do Researchers Investigate?

Researchers have examined saffron many times. In total, there are 300 papers on saffron, 207 of which involved humans, and 161 of those were controlled. Controlled means there was a comparison group that received something else, for example a placebo. In the human studies, the focus was mainly on mild to moderate depression. Some studies compared saffron with a medication, others with a placebo. Other studies looked at mild to moderate Alzheimer’s disease. The papers show that researchers have indeed examined these questions. However, each study was only a small snapshot and lasted weeks. What remains open: whether the red threads and petals have the same effects, whether the results can be replicated in very large groups of people, and which compound in the mixture plays the key role. Hypothesis: Perhaps the many compounds only work together, and none alone.

4. An Experiment to Think About

You can try thinking like a researcher yourself. Take two cups of warm water. Place a small saffron thread in one cup, and nothing in the other. Ask a friend to guess which cup is which without looking inside. Then switch roles. Why is this done? Because it is easy to be misled when you already know what is inside. This is exactly why studies use comparison groups and placebos: so that no one sees only what they want to see. And another thing you will notice: both cups smell, but only one has turned yellow.

For adults and professionals: the detailed page on saffron (Crocus sativus)