The ingredients list for that Catsip product state it contains only low fat milk, lactase enzyme and taurine.
Is this a complete ingredients list? I'm always suspicious of non-UK catfood ingredients lists, I never know if the manufacturers are obliged to include everything or not.
Anyway, if this Catsip stuff is really lactose free, why have they added lactase to it? Lactase is an enzyme which helps process lactose. Lack of lactase causes lactose intolerance. And lactose is, of course, a sugar.
Another concern would be if it contained soya, which I'm sure I've read is no good for diabetics.
Who is the manufacturer of Catsip? I couldn't find their name anywhere. I'd be happier looking at their website direct, rather than a retailer's website. Maybe even phone them. It all depends on what info by law US petfood producers need to provide on the contents of their products.
H