What people are buying at Wal-Mart is the Equate lice killer, which is Wal-Marts generic brand of Nix. There are always big arguments over using NIX vs. Provent-A-Mite (PAM). It basically boils down to this. NIX and PAM have the same active ingredient, permethrin. Both contain 99% "other" ingredients, which they don't have to list. PAM has been approved by the FDA as safe to use on reptiles, NIX has not, it is for humans, so no studies or tests have ever been done to determine if there are any adverse effects on reptiles. Some people use it, that is your decision...