The U.S. Food and Drug Administration announced plans to investigate the safety of inhalable or breathable caffeine.

The product is sold in lipstick-sized canisters and contains B vitamins, plus 100 milligrams of caffeine powder.  That's about the equivalent of the caffeine in a large cup of coffee.  Users put one end of the canister in their mouth and breathe in the fine powder which dissolves almost instantly.

The FDA wants to know whether the product is safe for consumers and whether its manufacturer, AeroShot, was correct to brand it as a dietary supplement.

AeroShot creator, Harvard biomedical engineering professor David Edwards, said the product is safe and doesn't contain taurine or other common additives used to enhance the caffeine effect in energy drinks.