Finding a flattering lip color is a challenge. It usually involves multiple trips to the store, countless swatches and some poor buying decisions. There are a number of hacks that make it easier for us to separate the not-quite-right lipsticks from the flattering ones, but one simple beauty tip has recently gone viral thanks to its unconventional hack. Apparently, if we want a flattering nude lip color, all we have to do is look at the shade of our nipples and try and match our neutral lipsticks to that.

(Related: ASOS Is Having A Beauty Sale, And You’re Going To Want Everything)

You might have heard the tip about matching your lip color to the inside of your bottom lip, but nipples? That is a new one. The advice was shared on a recent episode of The Doctors, and needless to say that it has gained a lot of attention from makeup lovers and everyone else who is surprised by the unconventional tip.

In the episode, physician Travis Lane Stork, MD, said, “We have a great way to pick your best shade for your face. What you want to do is match your nipple color. Nature knows best.”We’ll say.

(Related: You Can Now Get Julia Roberts’ Pretty Woman Dress Thanks To ASOS)

You can test it out to see whether it’s true or not, but just be aware that popping out a nipple in the store to see if it matches with your lipstick probably isn’t the best way to go about it.