I give every chin 1 rosehip a day. It is not enough food to make them cut down on pellets or hay. The vit C, according to studies from Stanford, may be very good for the the connective tissue associated with their teeth.
There is no need to cut down on raisons. Those, and other sources of sugar, should be eliminated. A hind-gut fermenter has no use whatsoever for raisons and all the other dried sweet fruits sold at such incredible mark-ups by chin supply companies.