Is cdp choline, magnesium, acetyl L-carnitine and lipoic acid MAO inhibitors?

NO. In general, MAO inhibitors refer to specific prescription antidepressant drugs & are highly regulated. Many foods & herbs have mild MAO inhibiting actions, such as carrots, chocolate, coffee, ginger, grape & onions,but these effects are not clinically significant & they don't need to be avoided if on a med that interacts with MAO inhibitors: http://www.botanical-online.com/english/vegetalmaois.htm.