'Vogue Beauty' is the definitive beauty experience, covering everything from cutting-edge skincare research to frizzy hair, holistic therapies and applying colour make-up.
On page 209 of Vogue Beauty, while browsing the book, they recommend shampooing every day as a means of ADDING moisture to 40+ hair! I don't think this is necessarily a well-researched book...especially since they have such short entries and don't necessarily give reasons behind their recommendations. That being said, if you read it with a bit of salt and don't take it as gospel, you might gain some insight into skin care, etc.