If you use this product according to its directions (and patch test — always be sure to patch test!), it shouldn't have any ill effects on your skin. However, it can be poisonous when ingested, so take care when (or, indeed, if) you decide to use it as a homemade toothpaste. Also, make sure to watch out for fakes: Due to its popularity, numerous frauds are circulating knock-offs which can be very dangerous to your skin — yikes.

Image via Imaxtree

Pretty much everyone is obsessed with the Aztec Secret Indian Healing Clay. "Riverdale" star Lili Reinhart recently documented her skin care routine, which includes the face mask (she says it's great for cystic acne). Khloe Kardashian cited Cleopatra herself as an inspiration for using the iconic mask, while Mindy Kaling praised the stuff by saying it helped with her "mega oily skin."

Image via @lilireinhart

There you have it: Everything you need to know about the Aztec Secret Indian Healing Clay. Do you know more trivia about this internet famous face mask? Let us know in the comments.

Image via Aztec Secret Indian Healing Clay