The study itself was not stopped, but the participants were told to stop taking the beta carotene and vitamin A or placebos.
Also in addition a wide range of vitamins and supplements, including Beta carotene.
These are rich in beta carotene which helps maintain healthy linings in the nasal cavities.
Was running rich e beta carotene the logic went.
Carrots are a great source of alpha carotene, probably more powerful than beta carotene in inhibiting processes that may lead to tumor growth.