There's nothing wrong with making rose hips a part of your daily diet, but don't count on the bright red fruits - or the prepackaged teas containing them - to supply all the vitamin C you need.
Rose hips contain a significant amount of vitamin C. However, the drying process destroys from 45 to 90 percent of it, and infusions extract only about 40 percent of what's left. That still leaves a fair amount of vitamin C, but considerably less than most herbals promise.
Many companies that manufacture vitamin C claim their products are "made from rose hips." In fact, none are made exclusively from rose hips. In commercial "rose hip" vitamin C preparations, the hips are combined with ascorbic acid from other sources.