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Limited evidenceEye health

Crocetin

A carotenoid from saffron and gardenia fruit, marketed in Japan for eye strain. The two published human trials actually measured sleep, not vision, and both were small and from the same research group.

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What the science says

  • Sleep quality Limited evidence

    A randomised, double-blind, placebo-controlled crossover study reported improvements in objectively measured sleep, including fewer awakenings, with crocetin in healthy adults with mild sleep complaints. The trial was small and follows an earlier pilot RCT from the same group; there is no independent replication.

  • Recovery from sleep-related fatigue Limited evidence

    An earlier pilot randomised trial of crocetin from Gardenia jasminoides reported better sleep efficiency and reduced awakening in a small group of healthy men. The sample was around 20 people and the study was industry-affiliated.

  • Eye strain and visual fatigue Limited evidence

    Despite being marketed for screen-related eye fatigue, a search of the clinical literature turns up no controlled trial of crocetin measuring accommodation, eye strain scores or visual fatigue. This claim is supported by product marketing, not published outcomes.

Dosage & safety

Studied doseThe human sleep trials used 7.5 mg of crocetin per day taken in the evening. No dose has been studied for eye-related outcomes.
SafetyNo serious adverse events were reported in the small trials, but total human exposure in the published literature is only a few dozen participants over short periods. Crocetin and saffron constituents may have mild antiplatelet and blood-pressure-lowering activity, so use caution with anticoagulants and antihypertensives. Avoid in pregnancy — high-dose saffron has traditional abortifacient use — and while breastfeeding.

How to take it

TimingEvening - the only human trials dosed it before bed for sleep quality.
With food?With or without food; the trials did not specify and no absorption data settle it.
Worth knowingDo not confuse 7.5 mg of isolated crocetin with the 30 mg standardised saffron extract used in mood trials - they are different products at different doses for different outcomes.

Interactions

With medications

  • warfarin, direct oral anticoagulants and antiplatelets

    Crocetin and other saffron constituents have mild antiplatelet activity. tell your prescriber before starting and stop two weeks before surgery

  • blood pressure medication

    Saffron constituents can lower blood pressure slightly, adding to the drug's effect. monitor your blood pressure when starting

With other supplements

  • fish oil, ginkgo and garlic

    Additive mild antiplatelet effect. be aware of the cumulative effect before any procedure

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does crocetin help eye strain?

There is no evidence that it does: no controlled trial has measured eye strain or visual fatigue with crocetin, despite it being marketed for screen fatigue, so the claim rests on marketing.

Does crocetin improve sleep?

The evidence is limited. Two small trials from the same research group reported fewer awakenings and better sleep efficiency with 7.5 mg of crocetin in the evening, but neither has been independently replicated.

Is crocetin the same as saffron extract?

No. The sleep trials used 7.5 mg of isolated crocetin, a different product from the 30 mg standardised saffron extract used in mood trials, at a different dose for a different outcome.

Is crocetin safe?

No serious adverse events occurred in the small crocetin trials, but only a few dozen people have been studied over short periods. Use caution with anticoagulants and blood pressure medication, and avoid it in pregnancy and while breastfeeding.

Scientific references

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