According to Dr. Rebecca Tung at Loyola University, oral sunscreens work well when used in conjunction with topical sunscreen products. Oral sunscreens contain extracts of cabbage plant that have powerful antioxidant and anti-inflammatory properties. Used alone, oral sunscreens do very little to protect the skin from premature aging and skin cancer.
For more information on this topic, click on the following link:
Medical News. (2013). “Oral sunscreens not as effective as traditional lotions and creams, warns Loyola dermatologist”. Retrieved August 30, 2013, from: http://www.news-medical.net/news/20130829/Oral-sunscreens-not-as-effective-as-traditional-lotions-and-creams-warns-Loyola-dermatologist.aspx