I have extremely dry skin; how long does the effect of Rivicol usually last? lol

Since it's summer and I'm exposed to the air conditioning in the office all day, all the moisture deep in my skin has completely evaporated, and it feels like it's going to crack. ㅠㅠ No matter how much moisturizer I slather on before bed, the next morning my skin is so dry that my makeup looks patchy and the dead skin cells are unbelievable. Lol. To firmly tackle inner dryness and strengthen the skin barrier, I need something that replenishes collagen. Livicol So many people have been recommending this, and I'm totally intrigued! Even if you have thin, extremely dry skin like me Livicol Will a subtle glow spread from deep within after getting it? And after just one treatment, this moisture stays perfectly intact. Duration I'd like to know roughly how many months this lasts. If there are any people who have definitely seen their inner glow filled in, please let me know. Livicol I would be so grateful if you could leave tons of helpful tips before you go.