YES- highly advised
Many experts feel it is optimal to achieve a vitamin d level of at least 45 ng/dl. Most adults need to take 4000-5000 units a day to achieve these levels, so taking 4000-5000 units plus a multivitamin is wise. Toxicity won't occur with 10, 000 units or less/day. See http://www.Huffingtonpost.Com/dr-mark-hyman/vitamin-d-why-you-are-pro_b_585311.Html.