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Optiphen is a paraben and formaldehyde-free preservative...It does not seem to leave as much of a smell like some others (like Phenonip...which I hate b/c it is all I smell in lotion). Have heard good things about Germall Plus too.
Posted at 4:31 pm Jun 7, 2012 EDT
Aside from recommending a particular preservative, Lotioncrafters website is one of the best as far as information. They have usage rates, pH limits, and MSDS listed for all their preservatives, and they offer a very wide variety. Shipping is super quick too :)
Posted at 12:03 am Jun 9, 2012 EDT