Vitamin D -- specifically the form D3 -- is the only vitamin your body makes itself. It's fat-soluble, which means your body stores vitamin D in its adipose tissue -- in its fat. And, if you want to be specific about things, this vitamin is actually a hormone.
Sullivan's Castle Island, South Boston, MA, Est. 1951. Castle Island. Located at the end of Carson Beach, on Pleasure Bay in South Boston, Castle Island is a 22-acre recreation site, and the site of Fort Independence. Castle Island was really an island until several land reclamations through the years extended causeways and eventually roadways.
Castle Island is one of Boston's most popular fishing spots. Fish off the pier and around Pleasure Bay. Search the side of the bowl, as named by fishermen, across from the shallow beach for a quiet spot to cast away. See Castle Island, Pleasure Bay, M Street Beach and Carson Beach for full description of this park.