Crocetin is a carotenoid extracted from the fruit of Gardenia jasminoides, and it is one of the ingredients Japanese brands reach for when a product targets eye comfort during screen work or everyday sleep quality. Brands abroad ask for it because Japan has small human trials behind it, which is unusual for an eye-health botanical.
This guide is for brand owners planning a crocetin product made in Japan. It covers what those trials actually measured, how Japanese products describe the ingredient, and what to decide before a formulation is quoted.
Health supplements are foods, not medicines, and are not a substitute for medical treatment. Nothing here is a claim that any product prevents, treats or cures a disease.
💬 Planning a crocetin product made in Japan? We check the full formula against Japanese food law first. See Japan-made supplement OEM.
What the research shows
Two small Japanese crossover trials report that crocetin eases the pupil’s response to screen work and improves some measures of subjective sleep quality, but both are short, small and from the same research group.
| Study | Design/What was analysed | Reported result |
|---|---|---|
| Randomised, double-blind, placebo-controlled crossover trial, Japanese Journal of Complementary and Alternative Medicine 2017;14:9–16 (DOI 10.1625/jcam.14.9) | Adults with subjective eye fatigue; pupil constriction ratio measured before and after visual display terminal (VDT) work, with 4 weeks of crocetin intake | The change in pupil constriction ratio after rest was significantly larger in the crocetin group, and subjective eye-fatigue scores improved |
| Randomised, double-blind, placebo-controlled crossover study, Complementary Therapies in Medicine 2018;41:47–51 (PMID 30477864) | 30 healthy adults with mild sleep complaints; 7.5 mg/day crocetin or placebo for two 14-day periods, separated by a 14-day washout; single-channel EEG plus the OSA sleep questionnaire (OSA-MA) | Delta power during sleep was significantly higher with crocetin than placebo, and participants reported better morning alertness and refreshment; sleep onset latency, efficiency, total duration and night-time awakenings did not differ |
Points to keep in view:
- Size and duration. Both trials ran for a few weeks with 20–30 participants — enough to detect a signal, not enough to call the effect settled.
- Crossover design. Each participant received both crocetin and placebo, which controls for individual differences but still leaves a small total sample.
- Same research group. Both trials share overlapping authorship, so independent replication by other teams would strengthen the picture.
- Partial results. The sleep trial improved some measures (delta power, subjective alertness) but not others (sleep latency, efficiency, duration, awakenings). Describe the specific measures that changed, not “better sleep” in general.
Checked against the published abstracts on 25 September 2026.
What Japanese products say
In Japan, crocetin appears in Foods with Function Claims notified for functions such as easing the decline in the eye’s focusing ability from PC and smartphone work, and supporting sleep quality by helping people wake feeling less tired.
Under Japan’s Foods with Function Claims system, the notifying business is responsible for the scientific evidence behind the stated function, submitted to the Consumer Affairs Agency before sale. The wording stays close to what the trials measured — the eye’s accommodation response during screen work, and specific sleep-quality measures — rather than broader claims about vision or general health.
💬 Need an evidence summary for your regulatory adviser that matches the exact measures these trials reported? We prepare it with the manufacturing documents. Tell us your market.
Wording that stays on safe ground
Describe crocetin by the specific measure a trial reported, not by a promise about vision or sleep in general.
| Safer wording | Wording to avoid |
|---|---|
| ”Studied for eye comfort during screen work" | "Improves eyesight” or “restores vision" |
| "Studied for sleep quality measures such as morning alertness” | Names of sleep disorders, or “cures insomnia” |
| Naming the study and its sample size | ”Clinically proven” without qualification |
How crocetin is formulated
Crocetin is dosed in single-digit milligrams per day in the trials above, so it suits a small tablet, capsule or soft gel and is easy to combine with other eye or sleep ingredients.
| Dosage form | Why brands choose it | What to weigh up |
|---|---|---|
| Hard capsule or tablet | Small daily serving, low cost per day | Colour of the material can tint the shell |
| Soft gel | Pairs with oil-soluble carotenoids such as lutein | Shell material and dietary suitability |
| Combined “eye” or “sleep” formula | Matches how Japanese products position it | Every companion ingredient needs its own food-law check |
Decisions that shape the specification:
- Source and extraction. Crocetin for foods is extracted from gardenia fruit. Ask the supplier for the extraction method and the confirmed crocetin content of the material.
- Amount per serving. Match the amount to the trial you intend to cite — 7.5 mg/day was used in the sleep trial above.
- Companion ingredients. Crocetin is often combined with other carotenoids (lutein, astaxanthin) in eye formulas, or with relaxation ingredients in sleep formulas. Each companion needs its own check against Japanese food law.
- Your market’s status for crocetin. Its status as a food ingredient differs between countries. Confirm it before committing to a formula.
The check that comes first
Every ingredient must be permitted in foods in Japan, or a Japanese factory cannot make the product.
Crocetin from gardenia fruit is established in Japanese foods. The risk in a combined “eye” or “sleep” formula usually sits in a companion botanical that Japan treats as a medicine rather than a food. See the Japan-made supplement OEM page, and our lutein and zeaxanthin and bilberry guides for related eye ingredients.
Before you ask for a quotation
A factory can quote accurately once the amount, the form, the companions and the packaging are fixed.
- Crocetin amount per serving and servings per pack
- Dosage form
- Companion ingredients and their amounts
- Packaging
- Countries you will sell in, and crocetin’s status there
- First order and annual volume
💬 Ready to design a Japan-made crocetin product? Send us the concept — amount, form, companion ingredients and the countries you will sell in.
Frequently asked questions
1. Does crocetin help with eye fatigue from screen work?
A small Japanese crossover trial found that 4 weeks of crocetin improved the pupil’s response to accommodation after visual display terminal work and reduced subjective eye-fatigue scores. The trial was small, so describe it as studied for eye comfort during screen work.
2. Does crocetin improve sleep?
A 2018 crossover trial in 30 adults with mild sleep complaints found crocetin increased delta power during sleep and improved subjective morning alertness and refreshment, but did not change sleep onset latency, efficiency, duration or awakenings. Describe the specific measures, not sleep in general.
3. What dose was used in the trials?
The sleep trial used 7.5 mg/day for two 14-day periods. The eye-fatigue trial ran for 4 weeks; match your specification to whichever trial you plan to cite.
4. Where does crocetin come from?
It is extracted from the fruit of Gardenia jasminoides, the same plant used as a traditional Japanese food colorant.
5. Can crocetin be combined with other eye ingredients?
Yes. It is often paired with lutein, zeaxanthin or astaxanthin in Japanese eye formulas. Every companion ingredient needs its own check against Japanese food law before the product can be made.
Sources: “Effects of Crocetin on the Pupillary Response during Accommodation Induced by Visual Display Terminal Work: A Randomized, Double-blind, Placebo-controlled, Crossover Trial”, Japanese Journal of Complementary and Alternative Medicine 2017;14:9–16, DOI 10.1625/jcam.14.9; “Effect of crocetin on quality of sleep: A randomized, double-blind, placebo-controlled, crossover study”, Complementary Therapies in Medicine 2018;41:47–51, PMID 30477864; Consumer Affairs Agency notifications for Foods with Function Claims. Checked on 25 September 2026.