Right.

Like your vitamin C, your exfoliating a- um, acids as well are kind of the two biggest ones.

Some kinds of niacinamide can, can also be ir- um, irritating.

So yeah, I think the actives is a really big one, and then the common allergens like fragrances or essential oils like tend to be the biggest things that happen.

And there's lots of different like allergies that, that people can have that we have to sometimes formulate around, and also lots of things that are more on the natural side because so many people have allergies to different like natural co- components.

It's a lot more difficult to predict like allergic reactions because when you're dealing with natural stuff, there's so... like there's so many chemicals in each one of these natural ingredients that like make up this oil, this ex- this extract.

So it's kinda hard to know.

Mm.