Supplements such as L-tyrosine or Mucuna Pruriens can increase dopamine, but their use should be infrequent to avoid the inevitable crash and reduction in baseline dopamine levels.

“I do use L-tyrosine from time to time for enhancing focus and motivation, but I want to emphasize from time to time. So I might use it once a week, occasionally twice a week, but I've never been one to take L-tyrosine regularly in order to focus or train or do any kind of mental work.”