have been taking 750 mgs of sust a week for 6 weeks , but my source can not get me anymore, instead he has 10 duratest 250 , is it ok to use these duratest 250 in place of the sust and is it ok if i lower the dosage from 750 to 500 mgs a week so i can get another 5 weeks from this cycle, will i still grow of this cycle even due to the changes? thanks for help.