Natural Beard Growth Serum with Castor Oil and Biotin . Beard Serum moisturizes facial hair and the skin beneath. Beard Serum is hydrating to the skin and helps soften ,regrowth and tame beard hair. HEALTHIER & FULLER HAIR - Our nourishing formula strengthens thinning and weak hair resulting in noticeably thicker, fuller and healthier beard hair. Hair becomes smoother and shinier with less frizz and breakage. HAIR GROWTH - ARGANRRIO Beard Hair Growth Serum is packed with vitamins, antioxidants and nutrients that effectively stimulate stronger and faster hair growth