I might be a little late here, but this is relevant information to the original poster and others too perhaps.

You do not want to supplement with Dopamine, L-Dopa, or Mucuna pruriens when messing with cycling compounds and ALDH inhibition.  Some dopamine metabolites, specifically the ones metabolized by MAO are toxic, and are linked to diseases such as Parkinsons.  DOPAL is the culprit, and ALDH is what clears the toxic metabolite into a non-toxic one, called DOPAC.

ALDH inhibition is nothing short of amazing but in my opinion the potential risks from consumption of herbs,. drugs, & foods are even more severe than that of MAO inhibition.  The benefits of this are that we can reach enlightenment through diet alone.  This is no plaything, the implications are literally endless.  We need to be careful however as this is uncharted territory, or rather re-discovered lands long forgotten.

ALDH apparently is not necessary for mammalian life.  There are studies that lead me to believe that it is an inherited enzyme that we have developed to help us metabolize alcohol & other spoiled foods.  I am even of the opinion that if one would diet and avoid the majority of substrates of ALDH & friends, that the enzyme would naturally down-regulate.  Combined with Black pepper, we would have all the Tryptamine & Phenylethylamine we could ever want.

I think this might be who we really are.