Aortic insufficiency is a structural problem with the valve, there is absolutely nothing that drugs or herbs can do at all to rebuild the valve tissue. The only thing that can help is surgery, but that is only done when it is negatively impacting your life too much.
Somebody here mentioned about supplements helping that's absolutely wrong. Supplements can make the matters worse especially diet supplements like phen-phen which is off the market now.
I presume you have Aortic regurgitation. People can be asymptomatic for a long time with this condition and that in itself is the danger of this condition because when symptoms ( shortness of breath) occur it is many a times too late for surgery.
There guidelines as to how to monitor your condition and when if necessary to operate. The key is to monitor the heart with serial echo cardiograms, to see if the heart is dilating and to operate before you are symptomatic.
The things you can do (provided you do have significant regurgitation) Keep your blood pressure controlled with aggressive medical regimen if needed to prolong the need for surgery as higher BP will increase regurgitation.