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 Hill is a link in the Bay Circuit Trail. Grounds: year-round, daily, 8am to sunset; historic landscape tours May 23 through October 26. Great House: guided tours May 22 through October 12. A wide range of public programs are offered throughout the year; please visit our events calendar for upcoming programs.