Rosehips may be eaten fresh or prepared in other ways, including teas, powders, and supplements. When using fresh rosehips, discard the seed-like achenes and hairy fibers, which may irritate. Unprocessed rosehips are rich in vitamin C, but processing and preserving methods may decrease vitamin C content.Rosehips may be eaten fresh or prepared in other ways, including teas, powders, and supplements. When using fresh rosehips, discard the seed-like achenes and hairy fibers, which may irritate. Unprocessed rosehips are rich in vitamin C, but processing and preserving methods may decrease vitamin C content.