The invention relates to the use of proanthocyanidins A from cranberries for colouring pharmaceutical products. The invention also relates to a specific pharmaceutical dye extracted from concentrated cranberries that comprises at least 35% of proanthocyanidins A, and to pharmaceutical preparations containing such a dye.Lobjet de linvention est lutilisation de Proanthocyanidines A issues de Cranberry pour la coloration de produits pharmaceutiques. Linvention concerne également un colorant pharmaceutique spécif ique extrait de Cranberry concentré comprenant au moins 35% de Proanthocyanidines A, ainsi que des préparations pharmaceutiques comprenant un tel colorant.