What is the treatment cycle for Vitaran (PN) to strengthen the skin barrier during seasonal changes?

I feel like my skin barrier has thinned lately due to the cold winds, so I am considering the Vitaran treatment. I understand that the PN ingredient is excellent for skin regeneration; how many sessions does Maypure usually recommend? I am wondering if receiving about three sessions at two-week intervals would help me maintain my condition throughout the changing seasons. I would also like to know if there are any cosmetics with specific ingredients that I should avoid after the procedure.