Is it just me, or does the Vitamin C ampoule sting? Sharing my honest experience.

I was really worried about my blemishes, so I finally decided to bite the bullet and buy a high-concentration Vitamin C ampoule. I applied it for the first time yesterday, and my face felt hot and turned slightly red. The product description says this is a temporary phenomenon, but I'm suddenly scared that it might not be suitable for my skin.

Does my skin get used to it if I keep using it, or should I stop using it now? Has anyone else experienced stinging at first like me, but then adapted and saw results?  Is there anyone who can share their firsthand cosmetic reviews? I've heard that mixing it with a moisturizer helps a bit, so I'm waiting for advice from Vitamin C experts!

I've also heard that Vitamin C products are tricky to store. I'm confused whether I absolutely have to keep them refrigerated or if it's okay to just leave them in a cool place. I'm curious to know if you have any personal storage tips to keep them fresh until the very end without browning, or if there is a specific time of day (morning vs. evening) to apply them to maximize their effectiveness!