The link did not work for me from the OP... however, it is known that the nutrients and nutrient levels listed in 1 out of 3 "multivitamins/supplements" even those regulated by the fda are incorrect when compared to the advertised label.
Therefore, just because it says 10mg/ doesn't mean it really is... Especially when considering the amount of fillers added to these types of products.
Though, good point on the cost per mg when compared to vita viotin crumbles verona. I bet you're right that if it is indeed alright to feed, it would be cheaper in the long run.