My understanding of this as a bio major, vitamins come in two forms, one is artificial and the other is natural...mortality has been linked to artificial vitamins in general, but just remember that its benefits outweigh its risks...just think of the many people who take vitamins...there is a vitamin line called juice plus that only uses the extracts from vegetables and fruits...there isnt even a dosage on the label because you cannot overdose on them, unlike artificial vitamin lines