The provided reviews and product information primarily focus on the effectiveness of Hyaluronic Acid 2% + B5 for skin hydration and moisture retention. There is no specific mention or evidence in the reviews about its effectiveness for lip plumping.

However, hyaluronic acid is a common ingredient in lip plumping products due to its ability to attract and retain moisture, which can temporarily increase the volume of the lips. If you are considering using this product for lip plumping, it might be worth experimenting with a small amount to see if it has the desired effect on your lips.