Cinnamon has a long history of use as a spice in both eastern and western cultures it is the brown bark of the cinnamon tree that is dried and used in its tubular form or ground into a powder natural herb suitable for vegetarians vegans food supplement cinnamon has a long history of use as a spice in both eastern and western cultures it is the brown bark of the cinnamon tree that is dried and used in its tubular form or ground into a powder natural herb suitable for vegetarians vega