To learn more about USANA and the science behind its products, please visit USANA.com. SALT LAKE CITY, April 14, 2025 /PRNewswire/ -- USANA Health Sciences, Inc., a global leader in cellular nutrition, recently conducted a clinical study on its Celavive Resurfacing Serum to evaluate the efficacy and tolerance of the product. The results showed that Resurfacing Serum was well-tolerated by all subjects and users showed statistically significant improvements in the appearance of their skin in just two weeks. T ...