They are both high in iron. I was told to be careful by my homepathic vet with them due to the high iron when my cat was anemic. But I did use the Spirulina there is a drink with it at a the health stores and my cat seemed to like the taste. It's high in B vitamins.
You can do a search on the net and should be able to order on line if you can't find it in the stores. GNC carry kelp I think maybe the other. Carla Date sent: Tue, 08 Mar 2005 17:22:54 -0800 From: catstevens <[EMAIL PROTECTED]> To: [email protected] Copies to: Subject: Liver shake Send reply to: [email protected] > Kelp or spirulina

