Silk amino acids (SAAs).
SAAs are hydrolyzed from silk protein and help to impart smoothness and shine to the hair and skin. In the hair care community, they are a popular addition to leave-ins and deep conditioners. In the skin care community, they may be added to lotions and moisturizers to achieve silky skin.
SAAs are on my 2011 wish list, so unfortunately, I do not have a personal review to share with you all. However, the following links are good places to start for anyone interested in experimenting with SAAs:
ABOUT SILK AMINO ACIDS
BUYING SILK POWDER
BUYING LIQUID SILK (contains preservatives)