This vitamin C ampoule is the only one that doesn't cause any trouble for my sensitive skin. It's non-irritating, not drying, and helps fade blemish marks. When used together with the Tokomac cream, the results are great, so I'm on my fourth bottle now. Highly recommended.

The only downside is the price. It's a bit more affordable if you can find it on a group purchase site.

I've tried several vitamin ampoules, but this is the first time I've encountered an ampoule that is so effective and has such little stickiness. It applies smoothly and there is no unpleasant stickiness or irritation after application, which I really appreciate. Another positive aspect is that when I first opened the product, there was an existing cap on the bottle and a separate dropper cap, which gave a sense of care and attention. The vitamins also seem to be well-absorbed, as my makeup applies nicely. After some time has passed since opening the product, there is a slight stickiness at the end, but it seems unavoidable. (However, it was still much less sticky than other products.)

Most importantly, the price is a factor, but since the effects are so good, I feel I have no choice but to purchase it (especially when it's on sale). Having to refrigerate it is quite inconvenient, I must admit. However, since that helps maintain the quality, I'm willing to endure the inconvenience.

I've been applying the product generously and patting it in thoroughly to really absorb it. As described, I'm using it twice a week for the first 2 weeks, then daily for the next 2 weeks, and now I'm using it daily and applying extra to the areas that need it most.