I have used some that was several years old with good results. Mine had not even been stored properly. Don't know if this is the norm or not but it worked for me.

Patsy

When I am being serious, I buy a fesh one every year..when not so serious, I use whatever I can find on the shelf, and can't say I see much difference. It may be the plants rather than the hormone, though. Many of them would root without it, but it makes me feel better. ;O)

Rootone is either indole butyric acid or naphthol butyric acid, depending on supplier and type. Both of these compounds are as stable as the rock of Gibralter if they are stored dry. Moist and in strong sunlight there might be some degradation but otherwise you should be fine.

George