I need to use some hydrogen peroxide on a wound, but my only bottle expired a year ago. Will it still be effective?
user
There’s no official expiration date for hydrogen peroxide, but it does have a short shelf life.  Basically, once it’s exposed to air, the hydrogen peroxide will oxidize and lose its medicinal properties.  So in this case I’d say it’s not a good idea to use the hydrogen peroxide.  In general, the shelf life of most solutions of hydrogen peroxide is about six months to a year, but this also depends on the concentration of hydrogen peroxide and other factors.  Why not just buy another bottle?
assistant
I need to use some hydrogen peroxide on a wound, but my only bottle expired a year ago. Will it still be effective?
user
There’s no official expiration date for hydrogen peroxide, but it does have a short shelf life.  Basically, once it’s exposed to air, the hydrogen peroxide will oxidize and lose its medicinal properties.  So in this case I’d say it’s not a good idea to use the hydrogen peroxide.  In general, the shelf life of most solutions of hydrogen peroxide is about six months to a year, but this also depends on the concentration of hydrogen peroxide and other factors.  Why not just buy another bottle?
assistant
I need to use some hydrogen peroxide on a wound, but my only bottle expired a year ago. Will it still be effective?