Something exciting is brewing in the skincare world. A new study suggests that a byproduct of beer production could make sunscreens more effective at blocking harmful ultraviolet B rays, which are responsible for sunburns. The finding could be significant, as studies have shown that many products on store shelves don’t deliver the level of protection they claim. Just last week, a Consumer Reports analysis of more than 100 sunscreens found that a majority delivered average Sun Protection Factor (SPF) levels well below what was listed on their labels. At the same time, concerns are mounting over whether some of the…