Lingual Vitamin C Test

Stephen Barrett, M.D.

This test is performed by placing a drop of 2,6-dichloro-indophenol on the tongue and noting the time required for the color to change from blue to pink. Proponents claim that this indicates whether there is enough vitamin C in the body. However, three published studies have demonstrated that the test is not valid. for this purpose:


This article was revised on April 9, 2002.

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