How long does the effect of a collagen booster usually last?

I've recently become interested in skincare, so while searching, I came across collagen boosters. They feel like they care for the skin from deep within, so I'm interested, but I'm not sure how long the effects last haha.

I searched online and found conflicting posts: some say it's good to receive collagen boosters consistently, while others say they were satisfied after just one session, so I'm confused about what's right.

I'm not the type to visit the doctor frequently, so I'd like a procedure with long-lasting effects. That's why I'm curious to know how satisfied those who have tried collagen boosters actually were.

I would like to know if the effects appear gradually or if my skin changes immediately after the treatment. I know there is individual variation, but I would like to hear at least a general overview of your experience.

By the way, could you also let me know how often you received your follow-up procedures? I'm leaving this post because I'd like to check out actual reviews before consulting the clinic. I look forward to hearing your thoughts!