yes true indeed Michelle , citrus essential oils are photo toxic when applied to the skin if the skin is exposed to the sun rays, sun light. However this serum is strictly for night time, in the morning wash your face well, then apply your moisturizer. I wouldn’t use any citrus oils on my face, during the day . I think this serum is great , my only concern is the shelve life because of the aloe Vera. Does the serum needs refrigeration ??