Its signature polish is made without ten chemicals it identifies as potentially health-harming in regular nail products, including dibutyl phthalate, TPHP, toluene, xylene, ethyl tosylamide, camphor, formaldehyde, formaldehyde resin, parabens, and tert-butyl hydroperoxide. The studio’s philosophy is rooted not only in cleaner ingredients, but in creating an experience intended to feel safer for both clients and employees. That concern grew out of the founder’s time in nail school, where the goal of developing a non-toxic, professional-caliber product and service took shape.

There is also a conscious ethical dimension to the business. Sundays acknowledges the prevalence of animal-derived ingredients in beauty formulas, including nail polish, and has shaped its product vision in response to that broader industry reality. Rather than treating non-toxic formulation as a marketing flourish, the studio makes it the basis of its identity and service model.

The overall effect is a nail studio with a disciplined, ingredient-aware perspective on personal care. Sundays pairs the polish and finish expected from a salon manicure with a more deliberate standard for what goes into the bottle, reflecting a belief that routine nail care can be elevated through research, restraint, and a stronger regard for well-being.