I take alcar, citicholine, and aniracetam daily w/ eggs with plenty of black pepper. Its a very nice stack.
No expirence w/ combining it with harmalas or dmt, but it goes great with other psych's i've tried it with (25i, 25b, allylescaline, 2c-c/i/d/t-2, mescaline, 4-aco-dmt, 4-ho-met). I take it sometimes when i get headaches, and ime it works very well to help alleviate them, i think it has something to do with o2 supply to the brain w/ racetams, and/or vasodialation.
In any case, choline from any source and alcar go great with racetams, they help prevent choline depletion. Alcar is an acetyl donor that passes the BBB, and helps acetylate whatever form of choline you take.