Theraplex Theraesthetics Botanical Stem Cell Serum 1 fl oz. An intensive anti-aging facial serum. Theraplex Theraesthetics Botanical Stem Cell Serum is a potent formula that smoothes skin for a more youthful appearance. Botanical stem cells, seaweed extract and hyaluronic acid balance moisture levels in the skin to create suppleness. With regular use, it diminishes fine lines and plumps the skin