How does Target track my shopping habits?

So I live in the EU but have family I’m visiting in the US. I like to go to Target and stock up on some things that are a bit harder to find back home while I’m here.

Totally aware that the U.S. has 1. More sophisticated and 2. Less intensely regulated marketing strategies, so I’m never shocked by the level of advertising here.

However today, I spent quite a bit of time in the vitamins/supplements section (I find a …

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