Based on the provided reviews, the Hyaluronic Acid Fresh Sun Serum by IsNtree seems to be generally suitable for oily skin. Many reviewers with oily skin types have praised its lightweight, non-greasy texture and the fact that it doesn't cause blemishes. Here are some key points from the reviews: - Reviewers with oily skin have noted that the serum absorbs well without leaving a sticky residue or feeling heavy on the skin. ([Review+](https://www.hwahae.com/en/products/2131678/reviews/10356173)) - Some users have mentioned that it works well under makeup without pilling or flaking, which is important for oily skin. ([Review+](https://www.hwahae.com/en/products/2131678/reviews/10355835)) - A few reviewers did mention that it might feel a bit rich for extremely oily skin, but this was not a universal complaint. ([Review+](https://www.hwahae.com/en/products/2131678/reviews/10326226)) However, it's important to note that individual experiences may vary. Some users with oily skin did report that it felt a bit too hydrating or that it caused a slight shine, especially in hot weather. ([Review+](https://www.hwahae.com/en/products/2131678/reviews/10277751)) In summary, while the Hyaluronic Acid Fresh Sun Serum appears to be a good option for many people with oily skin, it might not suit everyone perfectly. It's always a good idea to test a small amount on your skin before committing to a full purchase, especially if you have particularly oily or sensitive skin.

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