With Rejuran, can the point at which the skin looks good and the point at which the skin tissue changes be different?

When looking at Rejuran reviews, some people say their skin looked better within a few days, while others noticed changes over time, making it difficult to establish a standard.

I am wondering if I should distinguish between the appearance of improved skin immediately after a procedure due to hydration or skin condition and the changes that occur during the skin regeneration process.

Ultimately, I am also curious about at what point in time it is appropriate to judge the effectiveness based on the condition of the skin.