echinacea for cats?

[grasswire]

After reading about use of echinacea to boost the immune system in cats, I started my big orange marmalade tabby on a routine of tincture of echinacea today in the hope that he will have a better winter for it. He's an inside cat, twelve years old, and I have been thinking that he's slowing a little bit in the last month. I'm using pediatric strength tincture, several drops three times a day. Unfortunately, this stuff has an orange flavor so I have to mix it with a little baby food chicken meat.

Do any of you see a holistic veterinarian and use herbal supplements for your kitties?