What is the treatment cycle for Vitaran?

I feel like my skin barrier has thinned lately, 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 allow me to maintain my skin condition throughout the spring. I would also like to know if there are any cosmetics with specific ingredients that I should avoid after the procedure.