“…but they even more than vitamin A have an antithyroid and potentially antisteroid action by accumulating and displacing the vitamin A that's necessary for metabolism in the skin and making steroids. So you don't want to overload, especially on the carotenes, but eventually vitamin A itself can be an antithyroid, antisteroid problem. I got interested in vitamin A because I found that every time I worked outside in the summer, I got acne. And people had told me that sunlight was good for the skin, but I invariably got acne in proportion to my exposure to sunlight,”