Cinnamon is a great natural way to plump up your lips. Apply a small amount of ground cinnamon or cinnamon oil to your lips before you add your lipstick. You will feel a slight sting. If your lips are really sensitive, tone down the burn by mixing the cinnamon oil with 6 tablespoons of olive oil and the oil from collagen and vitamin E capsules. When mixed together, you will still have the slight sting, but the combination helps moisturize and lesson the sting. Either way, get ready for some more luscious lips.