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I bought a can of the winesave primarily for some of my single malts that I'd like to keep and try over longer periods than say some months. Tested it on a cheap but vibrant Tempranillo as I thought any changes should be  easily noticed. Whilst only over a period of 5 days I can say that any degradation was minimal, only noticing very minor oxidation. Without using it, I think this particular wine would have been undrinkable after the same period. Does it work as claimed? I believe so.