In Miyamuera’s (et al., 2010) study, the effects of various wavelengths of ultraviolet was compared through repeated exposure of human skin to suberythemal doses of ultraviolet A and/or ultraviolet B for two weeks. The study showed that in the ultraviolet B tanned skin; there was a higher melanin content and ultraviolet-protective effects against DNA damage as there was in the ultraviolet A tanned skin. The tanning from ultraviolet A was caused by the photooxidation of existing melanin and redistribution of pigment granules, thus tanning was seen in both exposures of ultraviolet A and B. However, ultraviolet B increases pigmentation coverage and involves the production of new melanosomes, as it stimulates melanocytes to up-regulate melanin synthesis. The study concluded that ultraviolet A tanning had no photoprotective effects in comparison to ultraviolet B
In Miyamuera’s (et al., 2010) study, the effects of various wavelengths of ultraviolet was compared through repeated exposure of human skin to suberythemal doses of ultraviolet A and/or ultraviolet B for two weeks. The study showed that in the ultraviolet B tanned skin; there was a higher melanin content and ultraviolet-protective effects against DNA damage as there was in the ultraviolet A tanned skin. The tanning from ultraviolet A was caused by the photooxidation of existing melanin and redistribution of pigment granules, thus tanning was seen in both exposures of ultraviolet A and B. However, ultraviolet B increases pigmentation coverage and involves the production of new melanosomes, as it stimulates melanocytes to up-regulate melanin synthesis. The study concluded that ultraviolet A tanning had no photoprotective effects in comparison to ultraviolet B