I don't have a single good thing to say about it. The only positive is that it's cheap, but the saying 'cheap is cheerless' comes to mind.

I previously used Clinique Vitamin C and it worked really well for me, so I thought I'd try a cheaper one from iHerb, hoping the similar or even higher concentration would have a similar effect. But 'cheap is cheerless'... There's not a single thing better about it compared to Clinique. In fact, it has no effect at all, and my skin actually got worse. I think vitamin C serums and essences work best for oily or combination skin types, as they help reduce oil production and minimize peeling. But this serum had no such effect. It didn't brighten my skin at all. After using it, my skin felt coated, and it was even a bit tricky to wash off. The reality is that skincare products only have a minor effect on skin improvement, but still, I'm going back to Clinique. I bought two bottles, and it was a waste of money.

I'm not quite sure yet, but I'm going to try using it generously. I've been using 5 drops twice a day in the morning. At first, I was worried that the color was yellow and oxidized, but after reading the reviews, I found that it's normal and in the form of ascorbic acid sodium phosphate, so it's actually in a stable state.

The color is yellow, so I thought it was all oxidized, but after checking the reviews, it seems normal.