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The Hyaluronic Sea Serum by OSEA was put to the test by Bethany in her video review. She specifically focused on the C serum, noting its thick consistency. Bethany was impressed by how quickly the serum absorbed into her skin, leaving it feeling hydrated and tightened. She even described the experience as rejuvenating. Overall, Bethany had a positive experience with the Hyaluronic Sea Serum, highlighting its fast-absorbing formula and its ability to provide hydration and tightening effects. However, it's important to note that the review did not mention any potential drawbacks or negative aspects of the product.