[Heber J. Grant]
... Of course no hard and fast line can be drawn, and where people desire to take a small quantity of [concecrated] oil inwardly in connection with the administration it should be permitted; but it must be emphasized that it is no part of the administration for the healing of the sick.
Where people desire to take consecrated oil from time to time for their health, as is the case with Sister Porter, we see no objection whatever to their doing so; ...
[Heber J. Grant and J. Reuben Clark, Letter to Joseph F. Merrill, as quoted in Minutes of the Apostles of The Church of Jesus Christ of Latter-day Saints, 1910-1951, Privately Published, Salt Lake City, Utah 2010]