If the grammar or syntax or spelling is incorrect, it stays in the store. No, I’m just kidding.
I normally do not read a lot of food labels, except to ward off buying anything laced with mayo or guacamole. (There aren’t many known Vegemite-infused products, but even if there were, those inscrutable Aussies would never allow a label to warn unsuspecting victims. Grrrrrrr.)
I know absolutely nothing about calories or carbs or gluten or protein or recommended daily allowances, etc., so I don’t bother to check for them. My metabolism is so fast and I exercise so much and my health condition is so good that I have never bothered with that stuff. It makes me yawn.
Depending on a product’s shelf life or perishability, I read expiration dates.
As for non-food items, I often check to see where a product was made, as in which country. I am biased toward US-made products, I am biased against certain foreign countries. For instance, a simple cotton shirt with a $29.99* price tag yet sporting a label showing it was made in a country known for sweat shops that pay (usually underaged workers or enslaved people) 23 cents an hour . . .
*This is merely a random and completely made up example.
~
(behooves)