One interesting thing about lactose free products is, that most aren’t lactose free. They only contain the enzymes to digest the lactose. If you are lactose intolerant this is perfectly fine, but if you’re allergic to lactose it doesn’t change anything for you
I‘m not from the US (Germany) and neither have I much experience with lactose free products. I know someone who is allergic to lactose though and when I was buying stuff for him he told me the exact brand of stuff I needed to get due to the issue I mentioned.