Ok the product he gave me to try was called Chito Sal, I have not used it because I have not looked into if it is organic or not and I doubt it is. "Chitsal is a plant based amendment specially developed to improve plant vigor. Derived from natural sources of oligochitosan and sallcin two powerful positive plant effectors."
natural chitosan sources are oyster shell flour, crustacean meal, insect frass, mealworms…
I am going from memory, but the above sources all provide Chitin. And as Reave notes, it is already part of the Coots soil recipe, Coots also used diastatic malted barley to provide Chitinase which is the enzyme that helps break down the Chitin. I understood that the presence of Chitin makes the plant think there are some hardshell bugs about and as a response may make them produce more of the 'good stuff' to put off those hard shell bugs that it thinks it detected. I have been using dried shrimp from my previous grow (soaked/rinsed at few times first to remove any salt). I don't know what contribution it made but the grow went well, and I added more into the soil over this last winter too which my current plants seem to be good with it in.Ohhh. Cool. So I already have that in my grow.