Nootropic Stack Calculator

This calculator pairs a primary and secondary compound for one of four cognitive goals and scales both doses to body weight. Stack Goal selects the pairing: focus combines 200 mg L-theanine with 100 mg caffeine, memory pairs 300 mg bacopa with 500 mg lion's mane, mood uses 600 mg ashwagandha with 200 mg rhodiola, and sleep stacks 400 mg magnesium glycinate with 200 mg L-theanine. Both doses then scale linearly with body mass against a 70 kg (about 154 lb) reference, so a 200 lb user sees doses roughly 30 percent above the base figures.

Caffeine Sensitivity touches exactly one number in the whole engine — the caffeine dose inside the focus stack — multiplying it by 1.5 for low sensitivity or 0.5 for high, while the other three stacks ignore the field entirely. Timing and cycling are fixed properties of the goal: focus is taken 30 minutes before you need it in a 5-days-on pattern, memory and mood are daily-buildup compounds with 28- and 42-day cycles respectively, and the sleep stack is taken 60 minutes before bed with no cycling (zero days on means daily use with no planned break). Not modeled: interactions with medications, existing caffeine intake from other sources, or individual response variance.