They say it's suitable for all skin types, but it didn't work for me at all?

Ah my daughter, you shouldn't jump to conclusions about everything. My daughter recently tried a serum like that, and it seriously caused an allergy on her face. Especially vitamin C can be very acidic and might not be suitable for slightly sensitive skin. Let's pause for a while and see if it improves first, then have a dermatologist take a look.

If your skin is turning bright red like this, stop using it immediately. Have you used other vitamin C products before? Maybe your skin is intolerant to vitamin C. Show it directly to a dermatologist, don’t waste money on other products 😅

Let's also accept this: just because everyone praises something, it doesn't mean it will be good for everyone. Maybe there was no need for skincare in the first place, and you ended up with issues because you overloaded it. You shouldn't trust advertisements too much; after all, everyone is looking out for their own pocket.

Vitamin C serums typically contain L-ascorbic acid, and when used in high concentrations, this can lead to sensitivity. If redness and burning on the face started immediately, it may be causing irritation. When purchasing a product, attention should be paid to whether the pH level and concentration are specified. The best course of action is to consult a dermatologist to discuss any potential allergy risk.

Update: Friends, I actually used another vitamin C before, but it wasn't this bad. This serum I got says it has 15% vitamin C, maybe that's related. I've stopped using it for a while now, let's see, and then I'll ask the doctor.

Since you said all influencers are using it, they probably have some PR product or whatever, so I don't actually think they're using it for real. I've started to see too many products that spend a lot of money and then end up being disappointing. It feels a bit like a commercial game to me.

Yeah, I was thinking about getting this serum too since it keeps popping up on social media. But what you just said scared me. Did anything happen to your friend, or were they satisfied with it? Most influencers seem to be playing a role, but you can't help but be influenced anyway.

Looking at it like Zeynep, the detail that seems small here is actually at the center of the issue. If I were in her place, I wouldn't make a definite decision without asking about that detail.