S. Hechanova: Was just reading from another commenter, tho i missed from what site (sorry!): GRgal : The work of early nutrition researchers such as Frank Pottenger and Weston Price showed in their many published papers and books, 'beta carotene is NOT vitamin A and does not prevent blindness. Retinol is vitamin A and prevents blindness. If mother is deficient in retinol, fetus cannot develop eye structures or normal thyroid. It takes about six units of b.c. to make one unit of retinol in the body. The conversion requires enzymes that are absent or very low in young children.'