Taking HADAMAMO on an outdoor day in Japan? Check age before the first spray: do not use below 6 months; from 6 months to under 2 years, use once a day; ages 2–11, use 1–3 times a day. Never apply it to the face of a child under 12.
I’m Irene, a Taiwan-born, Japan-licensed pharmacist working in a Japanese drugstore. When packing for a park visit or a walk outdoors, I would start with who will use the repellent and where it can go. The bottle’s gentle-skin message does not replace those checks.
Japanese product information checked: 19 October 2026.
- Match this bottle before following the directions
- How often can each age group use it?
- How to use the trigger bottle
- What does the “11–13 hours” claim mean?
- Which pests, and can it go on clothing?
- Skin, eyes and belongings: the checks worth remembering
- Three practical questions before packing
- Already bitten? Choose the next step separately
- Sources
Match this bottle before following the directions
This guide covers HADAMAMO Mist 200 mL (はだまも ミスト200mL), with the Japanese regulatory product name アース虫よけHJ1a. It contains 20 g of DEET per 200 mL bottle, a 10% formulation. Japan classifies it as a pest-control quasi-drug. It is a skin repellent for preventing bites, rather than an OTC medicine for itching after a bite.
The cooling ACT FIT version and older bottles with other regulatory names are outside this guide. If the label on your bottle differs, use its own directions. The manufacturer currently lists this 200 mL product; that does not establish stock at any particular shop.
How often can each age group use it?
- Under 6 months: do not use.
- 6 months to under 2 years: once a day.
- Ages 2–11: 1–3 times a day, no more than three.
- Age 12 and over: no fixed application-count limit on the label; use as needed and follow the precautions. This is not a reason to spray continuously.
A parent or other responsible adult must supervise use in children under 12. No application to their face, even if an adult sprays it into a hand first. Use only when needed, such as outdoors where mosquitoes or black flies are present. Do not let a general “reapply when needed” instruction override a child’s daily limit.
How to use the trigger bottle
- Move the grey stopper beneath the trigger to OPEN.
- For exposed arms and legs, spray an appropriate amount from about 15 cm away. Spread it evenly with the palm; do not leave untreated patches.
- For the face and neck, the general directions say to spray into the palm first and spread evenly. The face instruction applies only from age 12: children under 12 must not have this product applied to their face. Keep it away from eyes, mucous membranes and wounds.
- Return the stopper to its original position after use.
The spray can be used upside down, which may help with the lower legs, but it may not spray upside down when little liquid remains. Do not use it inside a car or breathe the spray directly. Do not spray toward the face.
Using sunscreen too? Earth’s brand FAQ advises applying sunscreen first, then HADAMAMO. Follow each product’s directions, including the repellent’s age limits.
What does the “11–13 hours” claim mean?
Earth gives an approximate 11–13-hour duration of repellency against adult-stage mosquitoes after one application. “Adult” here describes the mosquito’s life stage. It is not a guarantee of uninterrupted protection throughout a day, nor a separate proven duration for every child or every target pest.
The manufacturer says to consider elapsed time and conditions such as sweating when deciding whether to reapply. For children, the daily limits above still apply. For walks through grass, the brand also advises long sleeves and long trousers to reduce exposed skin; do not rely on spray alone.
Which pests, and can it go on clothing?
The label lists mosquitoes, black flies, horseflies, fleas, biting house mites, ticks, stable flies, bedbugs and land leeches as repellent targets. This does not make it a room treatment for an infestation.
The clothing and footwear direction is specifically for land leeches: spray an appropriate amount from about 15 cm away. Cover skin with clothing and footwear, and do not expose more skin because you have used repellent. Keep flames away from clothing or footwear immediately after spraying. Check the material restrictions below before using it on fabric.
Skin, eyes and belongings: the checks worth remembering
- Avoid the eye area, mucous membranes and open wounds. Do not get it in the eyes, swallow it or lick it; do not rub your eyes with a hand that has product on it.
- If it gets into the eyes, rinse immediately and thoroughly with plenty of water or lukewarm water. If you feel unwell or develop other symptoms, seek medical care immediately and tell the doctor it contains ethanol and DEET.
- Stop using it if skin irritation or another skin abnormality develops.
- Do not spray plastic items such as accessories or watches, or polyurethane-containing clothing such as some stockings: discoloration can occur. Do not spray decorated nails directly.
- Do not inhale the spray directly, and do not use it inside a car.
- Store in a cool place away from direct sunlight and fire, out of reach of children and people who require supervision.
- Use up the contents and dispose of the container according to local rules.
The formula is mildly acidic, has a fresh soap fragrance, and includes moisturising ingredients. Earth reports skin-allergy testing, with the explicit caveat that allergic reactions can still occur. It is not fragrance-free, alcohol-free or an all-natural formula; moisturisers do not establish suitability for every sensitive skin.
Ingredients in the current Japanese listing
Active ingredient: DEET, 20 g per 200 mL (10%). Other listed ingredients: dipropylene glycol (DPG), sodium hyaluronate (2), hydrolysed collagen powder, stearoyl phytosphingosine (a ceramide), ascorbic acid (vitamin C), citric acid, sodium citrate, ethanol, water, fragrance, and five other ingredients not individually named on the public product page. If you need to avoid a particular ingredient, check with the manufacturer rather than assuming this is a fully disclosed formula.
Three practical questions before packing
Can I use it during pregnancy or breastfeeding?
Earth’s FAQ advises following the amount and method of use and watching for increased skin sensitivity during pregnancy, after childbirth and while breastfeeding. Pause use if skin trouble or an unusual feeling such as feeling unwell occurs; seek medical advice promptly if it does not settle. If you have individual concerns, ask a healthcare professional before use.
Can I put it on a dog?
No. The manufacturer identifies this as a product for people and says not to use it on pets.
Can I send it by air?
Earth classifies this product as dangerous goods for air transport and says to tell the postal service or courier before asking whether shipment is possible. That shipping notice does not answer passenger carry-on or checked-baggage rules; check your airline and departure-airport rules separately.
Already bitten? Choose the next step separately
HADAMAMO is used for repellency. If you are choosing a product for itching after a bite, read the MUHI S, Liquid S2a and Alpha SII guide for their different ingredients, age guidance and application sites. Putting MUHI on a bite does not provide HADAMAMO’s repellent function, and spraying repellent onto irritated or broken skin is not an itch treatment.
My packing reminder: match the current bottle, check the youngest user’s age, count applications, and keep the under-12 face rule in mind. Those four checks matter more than the promise on the front of the bottle.
Sources
- Earth: current HADAMAMO Mist 200 mL product information, directions, precautions and ingredients
- Earth: HADAMAMO brand directions and FAQ
Read the complete directions on your own Japanese product before use. This guide does not replace individual medical advice.
