Dr. Ellen Gendler on Instagram: "Dermatologists, even when they are not board- certified, should know that sun powder does not substitute for actual sunscreen. IT DOESN’T. I understand wanting to sell a product you developed. That’s great. But sell it with correct information. Would be better if it contained the studied parts of the fern plant, rather than the roots and stem, in order to deliver benefits of protection from severe sunburn and help with skin conditions like polymorphous light erup