Will Vitamin C ampoules be effective?

Hello.

As I get older, year after year, looking in the mirror doesn't feel the same as it used to.

At some point, it seems like my skin sagging has become noticeably worse... My cheeks, which used to be firm, are now... so saggy... It really upsets me. I especially realized how much my skin elasticity has dropped, so I felt like I shouldn't put off taking care of it any longer.

I've heard from some acquaintances that Vitamin C ampoules are great for anti-aging care. They say it contains antioxidants that brighten the complexion and help with collagen production, so I've been quite interested lately. However, since my skin has become a bit sensitive as I get older, I'm also worried that the vitamin ingredients might be irritating.

So, I'm wondering if there is a specific way to choose a Vitamin C ampoule suitable for middle-aged individuals like me who are concerned about skin elasticity? There are so many types on the market, so I'm curious about what the appropriate dosage is, whether it stings when applied, and the texture—whether it applies naturally. I would also like to know if it is okay to apply Vitamin C ampoules at any time.

As I get older, I always worry about skin elasticity and pores. Do you have any products you've tried that you saw results from, or any skincare tips?