Facts
The rosehips from some species, particularly the dog rose (Rosa canina) and wild rose (Rosa rugosa), are one of the richest plant sources of vitamin C, with about 1700 to 2000 milligrams per 100 grams in the dried product. In contrast, an orange contains 50 milligrams of vitamin C per 100 grams and a kiwifruit 90 milligrams per 100 grams.
Myths
Much of the vitamin C in rosehip seeds is destroyed in the drying and extraction process. Many supplements that claim their vitamin C is from rosehips combine it with vitamin C from other sources. The quality of the vitamin C found in rosehip seeds is no better than that found in other, more common sources and it is more expensive and difficult to obtain.