Here’s what consumers have asked with answers from Phyto-C Skincare staff and previous consumers.
I think the Selenium in C Serum sounds really interesting. Selenium is really powerful antioxidant but I haven't heard much about it being used in skin care products. Apparently, the serum was supported a NCI Grant.
They make products specifically for dry skin. You can find those here: http://phyto-c.com/product-category/moisturize/
Doesn't look like they use anything that causes serious side effects. Some products do contain retinol which can burn/itch when you first start using it.