Most plant extracts that are in skin care creams are in such low concentrations and processed enough that any effect of them is negligible.  This applies to irritation but also, unfortunately, to how well it works.  I've never seen or read of a reaction to the tiny amount of mint extract in this product.  Still...... we are all individuals so if any skin care product irritates you, you should stop it right away and try to return it to the place where you purchased it.

 I've often thought that any ingredient in a cream that the company is claiming is therapeutic should be required to have the concentration on the label.  It would be great for consumers but I'm guessing this will never happen as the cosmeceutical industry wouldn't support it.  Also, there are so many great sunscreens out there so be sure to find one that gives you the coverage you need without irritation.  Dr. I