Olaplex's latest product, Lashbond, promises users "longer, thicker, stronger, and healthier lashes.Image Source / Getty Images Olaplex is launching an eyelash serum, its first product outside of hair care. The serum will go on sale Friday on Olaplex's website and at Sephora and Ulta Beauty. Olaplex is trying to stoke growth as demand for its hair care products wanes and it faces a lawsuit. Olaplex has its eyes set on yours — your eyelashes, specifically.The hair care brand is launching a serum designed to strengthen your eyelashes, Women's Wear Daily reported on Monday.