vitamin b12 on unwashed produce

From a social media site, on the topic of foraging and edible wild herbs. In response to the question, should I wash my produce?

"I never really thought about the benefit of what might be on plants prior to washing them until I met Saduh in Puerto Rico. He taught me that a vegan can get their b12 from the pollens that naturally settle onto fruits and veggies. Brief encounter, but easy to tell this, man is brilliant! http://organicfarm.net/ "