How often is Vitaran recommended?

Hello~ Lately, my skin feels a bit dry and my skin barrier seems to be compromised, perhaps due to the daily temperature fluctuations. So, I am considering a skin booster treatment. I heard that the Vitaran treatment, which contains salmon extract, is really good for skin regeneration and resolving internal dryness.

I want to restore my sensitive skin to a healthy state. How many sessions is typically recommended by doctors to see the full effects of Vitaran? I am curious if I can feel my skin texture becoming smoother after just one session, or if I need at least three. I also want to know if there are any issues with my daily life after receiving Vitaran. I would appreciate it if those of you who manage your skin well could share your know-how. Since it is quite expensive, I want to weigh the factors carefully before making a decision. How do you all manage your skin?