Cointreau is 40%, and Marie Brizard (IMO the only triple sec worth buying other than Cointreau) is 30%. MB is 39%. Is it? I could be mistaken. I'm away from home, so I don't have any bottles around and I just googled it. These guys say it's 60 proof. ← Well, I just checked my bottle, and it's 78 proof. Maybe it's a recent change?