From Petsmart description 8 in 1 brand FerreTone

Suggested Daily Use:
Adults: mix 3/4 tsp into food.
Kits, pregnant and nursing ferrets: mix 1 1/2 tsp into food.

http://www.petsmart.com/product/index.jsp?productId=2752080

I can't find the Marshall's brand info

I personally don't use FerreTone because of the cancer causing
preservatives.

I give mine 1/4 teaspoon of salmon oil instead. It acts as a skin and
coat supplement and a mild laxative in one saving me money.

I get this brand for mine
http://www.petsmart.com/product/index.jsp?productId=3531261

The kind without the Probiotics is cheaper
<http://www.petsmart.com/product/index.jsp?productId=2751686&keepsr=0&clickid=prod_cs>

[Posted in FML 6475]