?Kashrut?

Question

Just three questions: 1- When ingedients list "natural flavors" can't that be anything from fruit juice to cat gut? 2- You said that gum containing calcium stearate is kosher- isn't that a fat based product? 3- Bottom line, why can we trust the FDA; Rav Moshe's heter of chalav stam was not preferable- he himself says it's better to be makpid? -thanks.