I've never drunk it in large quantities, because it is very expensive and very sugary. I do enjoy a glass per day from time to time, though. I think it has some health benefits but I don't think I'd believe in its anti-SV properties without seeing scientific evidence. I do believe there is evidence behind the idea that cranberry juice can help prevent UTIs by stopping bacteria adhering to the bladder wall (not sure which component of the cranberry juice survives all the way to the bladder to do that). I wonder if conjecture has led to people thinking grape juice might prevent viral particles adhering to the intestinal wall in the same way. xxx