Can i take omega 3 and vitamin d3 with adderall (dextroamphetamine and racemic amphetamine)?

You can. The only : double-blind study I know of gave Omega 3's & 6's in kids already on methylphenidate preparations, not amphetamines for valid diagnoses of ADHD. It showed a slight positive effect in reduction of ADHD symptoms, both Inattention & Hyperactivy/Impulsivity only in the kids who continued taking their optimal doses of stimulants.