Jay M. Symptoms not very bad. Karl L. My congestion allergies did seem to get better after several days…Marsha R. I had some better days. Erin C. I believe it helped to a certain extent. William R. Improved after 3 days. Nancy acuvue color contacts c. on day 16 i felt so much better, by day 30 allergies continued to be improved. angel c. background of cyanocobalamin treatment in allergic disease mechanism of action: vitamin b12 is essential to cell growth and cell division. b12 is the only known molecule contacts in color the human body uses with the element cobalt. the unique contacts properties of cobalt permit a chemical reaction that produces the rungs of the dna ladder. these rungs are called nucleotides. for any human cell to divide, it must copy its own dna. for this replication to occur, new rungs of the ladder must be provided with the help of b12.