LUSH makes awesome shampoo bars, the point of them is they make no plastic waste with bottles and whatnot, and they last thru around 60 washes? They save some space too because they are pretty tiny. To use you can get a lather in your hands or rub in on your head a little, great for travel!
A lot of us use soap or shampoo bars on our hair. For the most part, it's handcrafted soap made the "old fashion" cold process way--lye is used to saponify oils and the resulting product is soap. Jillipoo interviewed me about my use of soap bars for the Daily Curl blog. Here's the link through nc.com:
The soap bars have more oil then the shampoo bars. I can't use castor oil on my hair, so am very picky about ingredients.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Marie Dean Leave Ins and Curl Creams