Nail polish is typically made from a combination of ingredients including:
* Film formers: Nitrocellulose is a common example.
* Resins: Help the polish adhere to the nail.
* Plasticizers: Add flexibility and prevent chipping.
* Solvents: Used to dissolve the other ingredients and allow the polish to spread smoothly.
* Pigments: Provide color.
While some animal-derived ingredients may have been used in the past (like guanine for shimmer), they are largely replaced by synthetic alternatives. Guanine can be obtained from fish scales as well.
Horses are not involved in any major or common ingredient in nail polish.