I have only been giving my cat this for 2 weeks now, however she is a very fussy animal and doesn't like change, so I am not able to give her the full dose that is required, she gets a drop of it in her wet treat, and that i will keep doing until she is 100% ok, as i tried 2 drops and she refuses to eat it.. very slow introduction with her is key, i have no doubt this will eventually be beneficial to her