Don't forget that you can find insight into the regulation of food, drug, cosmetics and other related materials on Practical Law (Westlaw) and Lexis Practice Guidance. These sources provide guidance from practitioners in this area.
Practical Law Life Sciences & FDA Regulatory Collection
Lexis Practical Guidance Life Sciences & FDA Collection
A Consumer's Guide to Food Regulation and Safety by 
Food Law for Public Health by 
The Little Book of Foodie Law by 
The Omnivore's Dilemma by 
