The government's dietary recommendations are 200 IUs a day up to age 50, 400 IUs to age 70, and 600 IUs over 70. But many experts believe that these recommendations are far too low to maintain healthful vitamin D levels.
Crater Lake National Park. Crater Lake National Park is a United States National Park located in southern Oregon. Established in 1902, Crater Lake National Park is the fifth-oldest national park in the U.S. and the only national park in Oregon. The park encompasses the caldera of Crater Lake, a remnant of a destroyed volcano, Mount Mazama, and the surrounding hills and forests.
Lake Chuzenji (ä¸­ç¦å¯ºæ¹, ChÅ«zenjiko) is a scenic lake in the mountains above the town of Nikko. It is located at the foot of Mount Nantai, Nikko's sacred volcano, whose eruption blocked the valley below, thereby creating Lake Chuzenji about 20,000 years ago. Chuzenjiko' shores are mostly undeveloped and forested except at the lake's eastern end where the small hot spring town of Chuzenjiko Onsen was built. The town is also the site of Kegon Waterfall, the most famous of several waterfalls in Nikko National Park.