references
general
Vitamin Safety
  1. Vitamin and mineral drug products for over-the-counter
    human use. Federal register yy44, part 2, No. 53, March 16
    1979.
  2. Campbell, T. C. et al.; feasibility of identifying adverse
    health effects of vitamins and essential minerals in man.
    Unpublished report prepared for the FDA, Washington DC, by
    the life sciences research office. Federation of American
    societies of experimental biology, Bethesda, 1980.