Four dosages of 20mg each, two times each week over two weeks, are intended by an unknown person. He knows that magnesium is recommended to reduce tolerance, but not in what doses, and that l-tyrosine may prove useful in preventing depletion of dopamine stores, but also not in what doses, nor whether to dose l-tyrosine on days of amphetamine dosage or days of no amphetamine dosage. Also, he knows that citric acid interferes with amphetamine absorption, but not whether citrate ions from magnesium citrate would be a source of concern. Finally, he has been told that compounds such as calcium carbonate serve to increase GI pH and thus increase absorption, but does not know whether the additional calcium would effect tolerance by increased Ca++ influx into NMDA receptors. He also does not know much about the effects of food on amphetamine absorption - would dosing before or after eating (breakfast) be more effective, and would the meal be best composed of proteins, carbohydrates, or fats? Any advice would be appreciated.