I would keep a journal for awhile; see if you can see any trends around nutrition or other physical aspects (sleep quality) and when you have better or worse days?
Quote:
Urinary and stomach pH levels can have a strong effect on DL-amphetamine excretion and absorption. An acidic stomach and GI pH will decrease the absorption of Adderall, and acidic urine levels will decrease the reabsorption of the drug through the renal system. Co-administration of acidic substances (e.g., citric acid) causes decreased renal reabsorption of DL-amphetamine; whereas, alkaline agents (e.g., antacids) may cause a marked increase in renal tubular reabsorption. The increased reabsorption can increase the retention of amphetamines, with potential to result in dangerously high serum levels.
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From:
http://en.wikipedia.org/wiki/Adderall