ETS Laboratories, a noted enological testing laboratory in Napa, California, tested Winelife and found it to be effective in the reduction of wine oxidation spoilage. Testing showed that no significant differences were observed between freshly opened wine and wine in bottles that were opened, then treated with Winelife and held for 10 days! Many satisfied customers claim Winelife keeps bottles fresh for months! As you can see, Winelife is a proven wine preservation method.