I've been liking MyFitnessPal. I can almost always find what I'm looking for on there, even as specific as the store brand from our local chain.
I also like the recipe feature where you can enter all the components from the recipe and have it add the calories for you. It has proven to be quite convenient for things I cook often. Though, I would not be surprised if other sites had this feature, I've never used anything else to know.
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