MSH might help people with some types of albinism to develop a natural sun protection, but MSH is costly to produce. . There are many other ways beyond sunscreen to avoid sun injury. Limiting exposure to UV light is an obvious way. A person who can tolerate one hour of sun in Florida without burning can tolerate two hours of sun in New Jersey under the same conditions. Reflected light may burn areas which are usually shaded, such as those under the nose or chin.
Clouds can cool and give a false impression that there is little risk of sunburn.
The greatest intensity of ultraviolet light occurs at the summer solstice, about June 22. May 1 has as much intensity as August 15. Colored clothing and denser-woven clothing allow less light penetration. Some types of tee shirts, such as Frogskin shirts, are designed to allow less light penetration when they are wet. Hats are essential.