in an article titled, "Effects of grapefruit juice on the absorption of levothyroxine", the British Journal of Clinical Pharmacology,Sep. 2005, states, "Grapefruit juice may slightly delay the absorption of levothyroxine, but it seems to have only a minor effect on its bioavailability. Accordingly, the clinical relevance of the grapefruit juice-levothyroxine interaction is likely to be small.