Morning:
Isopropylphenidate, 20 mg
Vitamin D, 5000 IU
Fish oil, 2000 mg

Mid-day:
Isopropylphenidate, 15 mg

Evening:
Melatonin, 1 mg
Magnesium, 200 mg

As needed (for even more intense focus):
Nicotine, 1.5 mg lozenges