Remember that humans often get too little D but can often use more of it. Humans get poisoning from too much A easily. Ferrets are the OPPOSITE. Three of the easiest ways to get more D are: 1. sunlight 2. fortified milk products 3. sardines For ferrets, dogs and cats D3 is the problem. I never looked up D levels in those foods, just knew that one of the researchers was considering that. http://dietary-supplements.info.nih.gov/factsheets/vitamind.asp AH! Raisins are high in boron which apparently is used when processing D so THAT must be what that aspect is under study: http://www.whfoods.com/genpage.php?tname=foodspice&dbid=33 http://www.whfoods.com/genpage.php?tname=nutrientprofile&dbid=24 Sukie (not a vet) Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/ http://www.ferrethealth.msu.edu/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html all ferret topics: http://listserv.ferretmailinglist.org/archives/ferret-search.html [Posted in FML 6508]