I really like Skinn Lip 3X Lip Volumizing Serum. Not so much as a plumper, but as a general conditioner. Skinn’s volumizer is a peppermint laden serum with collagen enhancing ingredients to plump the lips over time.
With a generous amount of sunflower seed oil, the volumizer also moisturizes and conditions quite well. I like it just before bed as nighttime lip treatment!
This one also comes in a generous sized container, so it will last awhile.