Tip - How to Use Preparation H for Wrinkles | LIVESTRONG.COM

Preparation H (the hemorrhoid ointment) was prepared with a live yeast cell derivative ( LYCD) called Bio-Dyne at one time in the U.S. It still is in Canada. It helps promote wound healing, thicken skin and reduces wrinkle volume. Today the U.S. version is made with phenylephrine, which is a vasoconstrictor and only temporarily tightens skin. What...