My skin is sensitive. How should I test this product to see if I can tolerate it?

Start with a very small test. Apply a pea-sized amount to a small, intact area of skin, like the inner forearm. Wait 15-20 minutes to observe the reaction. Warming gels can feel intense, and this will show you your skin's baseline response to the camphor, vanillyl butyl ether, and methyl nicotinate.

If the warming sensation and any accompanying redness are mild and comfortable, you can consider using it on a larger area. Always avoid broken, irritated, or freshly damaged skin. If at any point the burning or redness feels too strong, stop use and rinse the area thoroughly with cool water. Do not apply near eyes or mucous membranes, and wash your hands after use. If you have chronic skin conditions or are unsure, consulting a specialist before regular use is advised.