Merck has created a resource for practices who plan to stock both vaccines to help prevent potential mix-ups. Since both vaccines should be stored the same way (refrigerated and protected from light), Merck created an additional way to distinguish the vaccines by manufacturing them with different colored vial caps – Gardasil® has a green cap and Gardasil 9® has a brown cap. Visit Merck’s resources for complete details on Gardasil® handling and storage.