I was skeptical about this stuff actually helping the chronic itching that is apparently a "normal" problem for domesticated ferrets. But in the 3+ weeks that I've been using the Moisturizing Coat Oil on my ferrets, they have both almost completely stopped scratching. And don't let the small bottle size fool you - we only used 2-3 drops/day on each ferret for the first week, and now the same amount every 2-3 days or so. At this rate, it should last for roughly ... well, forever.