Carrot juice

 was an Earth-based drink enjoyed by Melanie Bush for its healtful properties. She tried to get the Doctor's sixth self to regularly consume it, to aid in improving his health. She claimed that its main ingredient, carrots, were rich in vitamin A. The Doctor did not particularly enjoy it, and tried to claim it was having an adverse effect upon him. He said, almost certainly untruthfully, that it was making his ears grow and inducing a limited form of colour blindness. (DW: Terror of the Vervoids, The Ultimate Foe)