Hello, I have a friend ( 76 yr old ) who resides over on the west coast who has been advised to have once a month injections of vitamin D 7.. What does this mean ? ? She is not computer savy so I am asking this question on her behalf. What does vitamin D 7 support ? ? How much vitamin D 7 should we have in our systems per day ? ? She eats extremely healthy food, this is what we cannot understand,, eating health home grown vegetables, fruits.. We are stumped by this reccomendation by her Reg. nurse. Regards, Jane Meharry Stoke.. Nelson.