I received a comment on this site mentioning the product “Neuro Gum”, so I went to the website www.getneuro.com and I see a compressed gum named “Energy & Focus” which contains Caffeine, Theanine, B6 and B12. It claims it provides the right balance between “energy” and “calmness”.
I have not tried this product (I wonder about its taste, chewability, flavor lasting, …) but as it falls within the functional gum category, I am glad to mention it here in this website.
Chewing Gum Consultant 