I started Reta a little over a month ago. Prior to start research suggested starting at small dose & increasing every 4 weeks.. I did 12mg of Reta & 2.4mL bac water. I began at 1 mg split into 2 days a week. So far I’ve done 4 weeks at 1mg & this will be my second week at 1.5. My question is, since I’ve had my vial for over 6 weeks, should I toss the remainder?