Bullfrog Secret Potion N.2 Multifunctional Beard Oil is a beard and mustache oil for men suitable for all skin types. The irreplaceable secret formula of barbers Bullfrog, ideal for achieving flawless shaves and nourishing longer beards. Secret Potion All in One Beard Oil is a multifunctional oil that can be used both as a pre-shave treatment and as a finishing touch to soften long and very frizzy beards.