How should I schedule the VitaRan cycle to combat internal dryness?

As the air starts to get dry, I am having a hard time because my face feels tight and as if it is going to tear as soon as I wash it.

Even after reapplying moisturizer, my skin felt like it was cracking deep inside, so I decided I couldn't go on like this and made up my mind to try Vitaran, which contains salmon extract. I have high expectations because they say it deeply replenishes moisture and strengthens the skin barrier, but since it won't be permanent after just one injection, I assume I'll need to continue using Vitaran for consistent care to maintain the results, right?

Usually, when scheduling the next VitaRan treatment after the first one, is the interval set to one month?

Alternatively, I am wondering if getting multiple treatments closely spaced out over a short period of about two weeks maximizes the effect. Since recommended intervals likely vary among dermatologists, I would like to ask for advice on the most ideal schedule from those who have actually received the treatments and resolved their inner dryness.