Do Naturally Fresh Deodorant Crystals contain aluminum?

No, Naturally Fresh Deodorant Crystals contain the naturally occurring compound Alum (Potassium or Ammonium), not to be confused with harmful processed aluminum (Aluminum Zirconium or Aluminum Chlorohydrate). Technically speaking, aluminum is a metal while Alum is a compound.  Many of these processed aluminum molecules can be absorbed into the skin and bloodstream. Alum molecules create a barrier against odor causing bacteria and contain a large molecule which does not penetrate the surface of the skin.