Recent studies suggest that an intake of vitamin E in excess of that found naturally in a balanced diet may actually increase the risk of developing certain illnesses, despite the claims of thousands of people who swear by it as a dietary supplement.

(a) Recent studies suggest that an intake of vitamin E in excess of that found naturally in a balanced diet may actually increase the risk of developing certain illnesses
(b) Recent studies suggest that taking vitamin E in excess of that found naturally in a balanced diet actually increases the risk of developing certain illnesses
(c) Certain illnesses may be at a higher risk of development if vitamin E is taken in excess of a
balanced diet, according to recent studies
(d) According to recent studies, the intake of vitamin E,if in excess of that found naturally in a balanced diet, may actually increase developing certain illnesses
(e) Vitamin E, recent studies suggest, if in excess of that found naturally in a balanced diet, may
actually increase the development risk of certain illnesses

i am confused here. can some experts help me out?
Thanks