| Capsaicin or capsicum-derived ingredients | Can stimulate sensory receptors and cause a temporary warming or tingling sensation. This may increase surface redness and make lips look more pronounced. | A flushed, slightly fuller-looking appearance; the degree varies by product and person. | Usually temporary, often fading within a few hours. | May cause burning or irritation. Avoid applying to cracked lips, and discontinue use if discomfort is strong or persistent. |
| Menthol | Activates cold-sensitive receptors in the skin, creating a cooling sensation. Some formulas pair this sensation with other ingredients that produce visible redness. | A cool, refreshed feel; the visual plumping effect may be subtle. | Generally temporary and dependent on the formula. | Cooling does not necessarily mean the lips are becoming larger. Sensitive users may experience irritation. |
| Cinnamon- or ginger-derived ingredients | May create a warming or tingling sensation and temporary surface redness in some formulations. | A short-lived appearance of more color and definition. | Temporary; results differ among products and users. | These ingredients can trigger sensitivity or contact reactions. Patch-test as directed and stop use if a rash or swelling develops. |
| Hyaluronic acid and other humectants | Attract and hold water in the outer layers of the lips, helping improve hydration and the look of fine dryness lines. | Smoother, more hydrated lips that may look temporarily plumper. | Often lasts while the product remains on the lips; reapplication may be needed. | Hydration improves appearance but does not permanently increase lip volume. |
| Emollients and occlusive ingredients | Ingredients such as oils, butters, and waxes soften the lip surface and help reduce moisture loss. | A smoother surface and glossy light reflection, which can make lips appear fuller. | Varies with the formula, eating, drinking, and reapplication. | The effect is mainly cosmetic and does not change lip structure. |
| Glossy finish and light-reflecting pigments | Reflect light and add visual dimension, especially when gloss is concentrated near the center of the lips. | An optical impression of extra volume without a tingling or warming ingredient. | Lasts while the gloss or pigment remains in place. | A visual effect only; it does not physically enlarge the lips. |
| Peptides and other conditioning ingredients | Used in some cosmetic formulas to condition the lips. Effects depend on the specific ingredient, concentration, and finished product. | May support a smoother, more conditioned appearance; immediate plumping is not guaranteed. | Depends on the product and regular use. | Do not assume all peptides produce the same result or provide a lasting increase in lip size. |