We often get asked our favourite books and this one from Neal's Yard is great for a bit of ingredients knowledge.
256 pages of information on ingredients derived from plants, trees, herbs, nuts and fruits including what it is good for and what it treats. There is also sections on recipes to recreate for cleansers, masks, lip balms etc as well as the best regimes depending on your needs.
Clear and concise this book breaks each ingredient down to make it simple for you to understand what is in your beauty products.
If you fancy having a go at making your own remedies then there is a section of recipes for simple treatments.
If you suffer with a particular hair or skin problem there are ideas on what you can do to rectify.
A good, interesting read which will loose you hours in your day!
Available from Neal's Yard for £16.99 http://www.nealsyardremedies.com/books