Using Preservatives

An excellent article about preservatives: http://www.fromnaturewithlove.com/library/preservatives.asp

From this I am gleaning that there are basically two categories of preservatives. 

Anti-oxidants and Anti-microbials. 

Anti-oxidants consist of Vitamin E and Rosemary Oil Extract. The Rosemary has it's own smell which will influence the final scent of the product, whereas Vitamin E will not. Use Vitamin E

Anti-microbials include grape fruit seed extract and Germabens. Germabens are basically Propylene Glyco (PG) Use PG

Article about PG:
http://swiftcraftymonkey.blogspot.com/2010/11/much-maligned-ingredients-propylene.html

PG can be used in lotions, shampoo, deodorants, conditioners etc.