Rules and Recommendations!!!! This is a quick graphic that you can keep with you to help you remember what's allowed and what isn't.
Rules, if broken, are a "Back to Day 1 for you" thing, so do your best not to go there!
It is, in my opinion, so very important to follow both of these lists (even though the Recommendations are not requirements). If your Whole30 doesn't go as planned, if you haven't followed the Recommendations, then you really don't know WHAT the cause for a less-than-stellar Whole30. If, on the other hand, you have followed the Recommendations, then there's one thing you can toss out as a possible source.
Good luck with your Whole30!