While vitamin K is well-known for its many systemic benefits, "the mechanism by which … See more

Here's the thing, though: Although the jury is still somewhat out, vitamin K has no known side effects. "Unless someone has an actual allergy to it, it's safe for all skin types," say… See more

As a general rule of thumb, you can go ahead and use it once or even twice daily, given that it's most often found in eye creams. For the best results, search for it in formulas w… See more