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Background: There are numerous cosmetic ingredients that have been identified to have blue light protection benefits. The urge to learn more about blue light protection claims has led to several substantiation test methods that can be utilized by companies to prove product efficacy. Aims: Part II of this article provides up‐to‐date information on cosmetic ingredients that can provide protection from blue light, and methods companies can use to substantiate blue light protection claims. Methods: An Internet search was completed using the Google Scholar database and a cosmetic ingredient supplier database (UL Prospector) for ingredients and relevant literature. Results: Multiple ingredient categories, for example, algae‐derived ingredients, UV filters, botanical extracts, antioxidants, and vitamins, are available on the market to fight against blue light‐induced skin damage. There is not a formal standardized method to test for blue light protection; however, spectrophotometers, imaging devices, measuring oxidative stress, and visual evaluations are some of the methods being used today. Conclusions: The number of ingredients launched for blue light protection and new methods developed to test products for blue light protection claims is expected to increase in the near future as we are learning more about the mechanism of damage that occurs in the skin upon blue light exposure. [ABSTRACT FROM AUTHOR]

Background: Blue light is emitted visible light between the wavelengths of 400 to 500 nm. The main source of blue light is sunlight, but digital screens, light‐emitting diodes (LEDs), and fluorescent lighting serve as additional sources. Concerns about the negative effects of blue light on the skin have rapidly increased over the past 15 years, and consequently, the urge to learn more about this topic is increasing as well. Aims: Part I of this article provides up‐to‐date information on the definition of blue light and the negative and positive effects of blue light on the skin. Methods: An Internet search was completed using the Google scholar database for relevant literature. Results: Blue light can be both harmful and beneficial to the skin, depending on intensity and wavelength. Short‐term safety information is more readily available from clinical studies; however, the biological effects of repeated and/or longer‐term exposure are not fully understood yet. Conclusions: Low‐energy and low exposure times to high‐energy blue light can help prevent skin diseases, while studies have revealed that longer exposure to high‐energy blue light can increase the amount of DNA damage, cell and tissue death, and injury, eye damage, skin barrier damage, and photoaging. [ABSTRACT FROM AUTHOR]