Nature's Own Synthetic Vitamins

Yes, Nature does produce vitamins by chemical synthesis; and thus these are literally "synthetic" vitamins: "Carotenoids are colorful fat-soluble pigments that are synthesized in nature by photosynthetic microorganisms." Components of variation in serum carotenoid concentrations: the Polyp Prevention Trial M R Forman, C B Borkowf, M M Cantwell, S Steck, A Schatzkin, P S Albert and E Lanza Eur J Clin Nutr 63: 763-770; advance online publication, April 16, 2008; doi:10.1038/ejcn.2008.26