Rebecca Park Totilo has put together wonderful recipes for using essential oils for natural skin care, hair care and bath and body products in Organic Beauty. Essential oils come from plant leaves or other parts of the flower or rind from citrus fruits.
One comment she made surprised me. The U.S. Food and Drug Administration, unlike its counterpart in the European Union, doesn't test 90% of the beauty products we use and many of them contain parabens which can be absorbed through the skin. Beware of products containing this chemical preservative (even if the label says "natural" or "organic") and often named with prefixes such as methyl, propyl, butyl and ethyl.
I won the book at I'd Rather be at the Beach blog. Hop on over to take a look at her book reviews.
I also found some sites that give more details on paraben/sulphate free products.
Sulfate Free Shampoo
Huffington Post Article
Walmart Paraben Free Shampoos