Nail products can contain a variety of ingredients, some of which may have positive or negative effects on nail health. Here is a summary of information from the search results:

Positive effects:

• Nail strengtheners: Some nail strengtheners contain added ingredients to make the product harder, such as amino acids and hydrolyzed wheat protein.
• Non-toxic nail polishes: Some brands market themselves as being free of certain toxic chemicals, such as formaldehyde, toluene, and dibutyl phthalate.

Negative effects:

• Formaldehyde: Formaldehyde is a common ingredient in nail hardeners, and even a concentration as low as 0.006% can trigger allergic contact dermatitis in sensitized individuals.
• Acetonitrile: Acetonitrile is a solvent used in artificial nail removers that can be harmful if inhaled or absorbed through the skin.
• Other harmful chemicals: Some nail products may contain other harmful chemicals, such as toluene, dibutyl phthalate, and camphor.

Ingredients or materials:

• OPI nail polish: OPI nail polish and base coat use trimethylpentanediyl dibenzoate as a plasticizer instead of dibutyl phthalate.
• Nail strengtheners: Nail strengtheners may contain ingredients such as ethyl acetate, butyl acetate, nitrocellulose, hydrolyzed keratin, and benzophenone-1.
• Other nail products: Other nail products may contain a variety of ingredients, such as resins, solvents, and vitamins.

It is important to use nail products safely, following labeled directions and paying attention to any warning statements. If you have a reaction to a nail product, it is important to report it to the FDA.