magnesium and b6 for the twitching/tic, less likely b12. i'd use balanced b complex with good b6 content, b6 needs other b vits to work, esp b1 and b2.

also possibly zinc if it seems stress-related.

use sensible amounts - check the %RDA / %DV. avoid megadoses.

toxicity:
... zinc can displace copper.
... B6 in large doses can cause permanent harm to the nervous system.