An intense mental work is no different from any other stresses. It might be wise to be respectful to your brain and feed it accordingly. Here what worked great for me.
Cortexin is polypeptides of the cerebral cortex of cattle and Medivitan is a mixture of pyridoxine (b6), cyanocobalamin (b12) and folic acid (b9). Make an injection in each thigh once a week or on a stressful day;
Antioxidant. Take once a week for a stable source of energy;
Everyone knows this. Gives you a pump to workout an advanced math book in a day. Once a week is enough;
Facilitates GABA-mediated transmissions. Makes you cool and focused;
- Alpha GPC+Selank.
It’s important to moderate those and never mix them amongst themselves or with other drugs or alcohol. Drink a lot of water, sleep well, exercise a little bit several times a day to reduce the biological half-life.
I think most from that list is legal… in selected countries.