Quality Science-Based Nutraceuticals. Good Manufacturing Practice (GMP) is a system for ensuring that products are consistently produced and controlled according to quality standards. It is designed to minimize the risks involved in any pharmaceutical production that cannot be eliminated through testing the final product.At VWS, we offer the finest GMP certified supplements. Try the VWS difference today! Open Tuesdays NOON-6pm. 1609 22nd Street, Niagara Falls, NY.