An SPF 30 screens less than 4% more UV radiation than an SPF 15, but those extra few percents guard from the higher range of UVA, the main ray drawn in triggering photosensitivity and photo toxicity. Thus, SPF 30 is great for those taking photo-reactive medications such as the antibiotic Cipro and other medications, or individuals with UV-sensitive diseases such as lupus erythematosus, rheumatoid arthritis, or HIV-positive. For most people, SPF30 is too much and may be more harmful than good. Organic sunscreens such as octyl methoxycinnamate can be irritating when used at higher percentages. Most dermatologists agree that an SPF 15 is a safe bet for the average person. Just remember to reapply an SPF 15 every couple of hours during full sun exposure. And always reapply after swimming or sweating.
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