The serum is great. It doesn’t completely get rid of under-eye puffiness, but it does reduce it—which is a lot better than other products I’ve tried.
As for redness, in my experience it can happen if you apply it to irritated skin (for example, after using acids), if it gets into your eyes, if it mixes with another active ingredient on your skin, or if you’re generally prone to allergic reactions. In three months of use, I had redness only once, when the serum mixed with liquid from patches.
I apply it over a neutral toner, wait about 30 minutes, then seal it in with a cream, and everything is fine.
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