What to Avoid Putting on your Nails

Manucurist Paris shares tips for addressing sensitivity and allergies and how their Green Flash LED gel polish can help.


Allergy to gel polish? HEMA, Di-HEMA TMHDC and Di-HEMA TMHDC all have a role to play.

You may have already paid for it! What are the culprits? The culprits? These substances are part of the acrylate and methylacrylate chemical families and are used in many traditional gel polishes. They can bond together when exposed to UV light or LED light to form a network of polymers. This is what gives nail polish its lasting power.

Since six months, these two molecules are in the spotlight. A new European regulation prohibits the sale of this type of sensitizing nail polish to the public. These products are available on the market, but they can be obtained easily, which exposes consumers to serious allergies.

Reactive molecules that permeate the skin…

These so-called “sensitizing substances” are very reactive chemically and can cause inflammation, especially if they come in contact with skin. If the gel polish coat is applied incorrectly and gets onto your fingers, the molecules can pass through the top layer of the skin or cuticles to reach the epidermis.

They can modify proteins in the skin by bonding to them. Your immune system will then perceive the “modified” epidermis proteins as foreign, causing an allergic reaction. Since its launch in 2019, Manucurist’s innovative Green Flash has been ahead of the regulation, offering a new generation of 12-free, non-sensitizing gel polish with no HEMA or Di-HEMA TMHDC monomersCourtesy of Manucurist Paris

Once allergic, will you always be allergic?

You don’t always see it. Sensitization occurs often away from the initial exposure site. The immune response is activated and set up at each exposure. This sensitization process is permanent, unlike irritation, because the body remembers and can trigger the immune response again even after many years.

Numerous studies and scientific reports show that these molecules have “sensitizing effects” on the skin (dermatitis), respiratory system (e.g. asthma), and skin (e.g. erythema). These small molecules can also be inhaled as they are very volatile.

Restriction and Regulation

This type of gel varnish must be applied carefully to avoid any risks. This is why the new European Regulation* forbids the sale of gel polish directly to consumers and only allows its conditional sale by nail care professionals who are encouraged to wear protective measures.

Green Flash is the non-sensitizing, alternative to Green Flash that does not compromise on staying power

Health is the first priority for a manicurist. Your health is not compromised by beautiful nails. Green Flash, their innovative gel polish, has always been ahead of regulations. It is a 12-free, nonsensitizing formula that does not contain HEMA or DiHEMA TMHDC Monomers. Green Flash means that gel polish will no longer damage your nails and you won’t have any allergies.


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