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Sierra has been using the Oat Milk PHA Serum by EqualRXN for a while now, ever since she received her last order. She swears by its effectiveness in improving her skin. Sierra highly recommends this serum, although she does mention that the price tag may be a consideration for some. Overall, the Oat Milk PHA Serum has been a game-changer for Sierra, providing noticeable benefits to her skin.