You must use sunscreen, SPF30+, when using The Neck Cream because it can cause the skin to become more sensitive to the sun. Improper protection can result in increased irritation.
Why do I need to use sunscreen if The Neck Cream is a nighttime treatment?
The Neck Cream contains Tretinoin which should only be used at night, to be washed off with your morning routine. You should still copiously apply sunscreen in the day time as your skin will still be sensitive.