Yes, and I consider it a GREAT habit, even if it can get annoying sometimes. My wife and I have been doing this more and more with everything over the past several years, even before I started reviewing here.
She used to have some pesky health issues and by learning to buy only natural and healthy things, she's feeling MUCH better than she did before. Me, too!
I believe it's better to live with eyes open, mindfully, than it is to blunder blindly through life.