When you get an elixir to turn a sim into a fairy, it is the Bottled Blessing of the Fae.
Yet if you want to be a werewolf, you ask your local werewolf for the werewolf curse. Your werewolf can give sims the cursed bite, and it's under mean interactions, no less. If you go the route of elixirs, you can pick up the Bottled Curse of the Lycan. Werewolves have the option to "complain about werewolf curse," while it seems that no other occult has a similar option.
Is this some sort of weird discrimination? My werewolves are as blessed as my fairies are, you know.