For parents
Is Slime Dangerous? The Parents’ Safety Guide
Boron, borax, detergent, squishies, water beads, magnets: what French, EU and US safety authorities say, and the simple habits that keep play safe.
Slime isn’t dangerous in itself, but some ingredients and some store-bought products can be a problem. France’s health authorities have issued several warnings since 2018; this site started in France, so it cites them first, and we’ve added the advice of the US Consumer Product Safety Commission (CPSC) where it applies. Here are the essentials, without the drama, with the official sources at the bottom of the page.
Boron: the main concern
Glue slime needs an activator that contains boron (boric acid, sodium borate, borax). In May 2018, ANSES, France’s food and health safety agency, pointed out that these substances are classified as toxic for reproduction and should not be handled repeatedly by children. It also reported skin irritation and burns linked to making slime with laundry detergents or other misused household products.
There’s no boron-free activator for glue slime: a “borax-free” recipe made with contact lens solution still contains boron, in a small amount. Our page slime activator explained compares the options.
Are store-bought slimes safer?
Not always. The European Union limits how much boron can migrate from a toy to 300 mg/kg for a sticky or liquid material like slime. Yet tests regularly find slimes above that limit:
- in 2018, France’s DGCCRF (consumer protection authority) found 2 non-compliant kits out of 15 checked, and the French consumer group UFC-Que Choisir found 3 slimes out of 13;
- the same year, BEUC (the European Consumer Organisation) found 42 non-compliant slimes out of 100 tested in Europe;
- in November 2024, the Danish consumer group Tænk, reported by the Belgian group Test-Achats, found that more than 60% of slimes bought from sites outside the EU (Temu, Wish, Shein, Amazon) released substances well beyond the allowed limits;
- slimes have been recalled for too much boron on RappelConso, France’s official recall site, regularly since 2021.
Smart habits: buy from a seller you can identify, check the minimum age and the warnings on the package (plus the CE mark in Europe), and if in doubt, look up the official recall list: cpsc.gov/Recalls in the US, RappelConso in France.
Glue and allergies
Glues contain preservatives, some of which can cause allergies (isothiazolinones, formaldehyde releasers), ANSES points out. Skin that turns red, itches or tingles after playing is a sign to stop, and to talk to a doctor if it doesn’t go away.
Boron-free recipes
For younger kids, or families who would rather avoid boron, several doughs need no glue and no activator: cornstarch and water, marshmallows, chia, gelatin. And all our homemade doughs (playdough, salt dough, cloud dough) are boron-free.
Squishies
On August 10, 2026, the DGCCRF, France’s consumer protection authority, warned against the “experiments” seen on social media with squishies, especially putting them in the microwave, after a child was burned. It advises not using a squishy that gives off an unusual smell, checking the CE mark and the minimum age, and reporting suspicious products on SignalConso, the official French reporting site. Also in August 2026, the French consumer magazine 60 Millions de consommateurs warned about counterfeit Squishy Dumplings containing volatile organic compounds. Squishies have been recalled before, for example in 2024 for preservatives above the limits. In the US, you can look up recalls at cpsc.gov/Recalls and report an unsafe product on SaferProducts.gov. Everything is detailed on the squishy dumpling page.
Water beads
Water beads (sodium polyacrylate) absorb up to hundreds of times their weight in water. If a young child swallows them, they can swell inside the intestine and cause a blockage. France’s DGCCRF says to keep them out of reach of young children, and the new EU toy safety regulation includes a requirement against this swelling risk. In the US, the CPSC warns that water beads can be deadly to babies and small children if swallowed and urges parents to remove them from any environment with children; a new federal safety standard for water bead toys took effect in March 2026. The instant snow used in cloud slime belongs to the same family of products: store the powder up high, out of reach.
Magnetic balls
In 2021, French health authorities (the DGS, the DGCCRF, Anses and Santé publique France) warned about tiny magnetic balls (⅛ to 3/16 inch, 3 to 5 mm), sometimes sold as fidgets: if several are swallowed, they attract each other through the intestine and cause serious injuries. The CPSC gives the same warning in the US and advises seeking immediate medical attention if magnets may have been swallowed. Keep them out of games and trades.
Fidget trading
Fidget trading isn’t physically dangerous, but it can create pressure or arguments. Set rules: what can be traded, the right to undo a trade, no trading with strangers online. Our trading board lists these rules.
If something goes wrong
- Slime swallowed in a small amount: rinse the mouth, give a little water, and call poison control to find out what to do.
- Slime in the eyes: rinse well with clean water, then call poison control.
- Burns, trouble breathing, feeling faint: call emergency services (911 in the US; 15, or 112, in France).
In the US, the CPSC lists the national Poison Help line: 800-222-1222. In France, poison control centers answer 24/7; their contact details are on centres-antipoison.net, the site listed by Anses.
The activator explainedBorax-free slimeFidget trading explainedSlime birthday party