Camellia Sinensis Green Tea, Black Tea, White Tea, Oolong Tea Catechin, Epicatechin MAO-B
Fallopia Japonica Japanese Knotweed Emodin MAO-B
Geijera Parviflora Australian Willow MAO-B
Olea Europaea Olive Oil Hydroxytyrosol MAO-B
Piper Methysticum
Kava Kava Desmethoxyyangonin, Methysticin MAO-B
Piper Longum Long Pepper Piperine MAO-B
Piper Nigrum Black Pepper Piperine MAO-B
Polygonum Multiflorum Fo-Ti Emodin MAO-B
Rheum Emodi Rhuharb Emodin MAO-B
Uncaria Tomentosa Cat's Claw Catechin, Epicatechin MAO-B
http://www.drugs-for...6#ixzz2Svanur1s
Since they are all reversible inhibitors, you get a pretty short-lasting effect. Also, they are not "pure" MAO-B inhibitors, so you get a lot of "side" effects.
Good luck finding a reasonable alternative (there probably isn't one).