Beard Guyz 1 oz. Beard Serum is a lightweight, water-based formula that helps promote a thicker, fuller beard without weighing you down. When your beard needs a boost —whether you’re starting your beard journey or want to thicken what you’ve already got— our Beard Serum is there for you. Made with pure quinoa seed and vitamin E, our serum nourishes hair follicles and creates a healthy environment on your face to promote beard thickness and growth.