Zinc Ricinoleate in Deodorant

I gave up using deodorants containing aluminum several years ago and have used several natural products since with varying degrees of success. Recently Tom's of Maine created a new deodorant that claims long lasting 24 hour protection. The ingredients include Zinc Ricinoleate to absorb oder. Is Zinc Ricinoleate safe or is Tom's just replacing one unsafe metal(aluminum) with another(zinc)?