http://www.msnbc.msn.com/id/43429680/ns/health-diet_and_nutrition/?GT1=43001
The article itself happens to be mostly about human vitamins, but it does contain the following quoted info:
“ConsumerLab also tested several pet supplements, one of which, Pet-Tabs Complete Daily Vitamin Mineral Supplement for Dogs contained lead at unhealthy levels.”
I don’t feed vitamin supplements myself, but thought this would be useful to know, as Pet Tabs seem to be pretty popular.