Natural components in sunscreens: Topical formulations with sun protection factor (SPF)

Measuring the Sun Protection Factor (SPF) of Sunscreens

Sun protection products, including sunscreen lotions, are designed to absorb or reflect the sun’s UV radiation to protect the skin from damage. The rating system for sunscreens specifies a Sun Protection Factor (SPF) value, which can be thought of as a time factor for the protection of skin compared to exposure without any protection. For example, if a person would show visible erythema (sunbur...

Sunscreens: Is Looking at Sun Protection Factor Enough?

The sun protection factor (SPF) has widely been used to evaluate the protective value of sunscreens. However, SPF only reflects the effectiveness of the sunscreen to protect against acute sunburn which is mainly due to ultraviolet B (UVB) radiation. The deleterious effects of UVB are well known and UVB was believed in the past to be the spectrum responsible for the damages arising from ultravio...

Sun protection factor of South African-tested sunscreens.

تعیین مقدار Sun Protection Factor (SPF) در کرم‌های ضدآفتاب به روش درون‌تن 

Application of sunscreens is one of the most important ways for skin protection against sunburn, early skin aging and skin cancer. Due to variety of sunscreen products, it is necessary to assure their protection ability against the sun’s damages. Performance assessment of sunscreens against UVB expressed by sun protection factor. Due to great cost of determination methods of this factor in for...

Comparison of UVA protection afforded by high sun protection factor sunscreens.

UVA protection afforded by 6 different sunscreens with a sun protection factor of 21 or more was compared by means of the persistent pigmentation darkening method. Colorimetric and visual assessment showed significant differences in UV radiation-induced pigmentation at 2 hours. The labeled sun protection factor of the tested sunscreens was not predictive of UVA protection level.