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  • noun Plural form of xanthine.


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  • A decade later, Cornell scientist Harry Gold no relation to Old was trying to figure out whether or not xanthines, a group of stimulants that included caffeine, really deserved their reputation as a remedy for angina.


  • For physiology the experimental proof that uric acid and the xanthines originate from one and the same parent form is of the greatest importance as it has provided the strongest support for the modern theory of the formation of uric acid from the nucleoproteins of the cell nucleus and from the purines contained therein.

    Nobel Prize in Chemistry 1902 - Presentation Speech

  • These, together with xanthines, poisonous alkaloids and ptomaines, are formed during the processes of protein and starch digestion and in the breaking down and decay of cells and tissues.

    Nature Cure

  • If acids, xanthines and oxalates of lime form earthy deposits along the walls of arteries and veins, these vessels harden and become inelastic, and their diameter is diminished.

    Nature Cure

  • From what has been said, it becomes clear why the meat-eater craves alcohol and xanthines.

    Nature Cure

  • Another brake is supplied by the waste products of metabolism in the system, the uric acid, carbonic acid, oxalic acid, etc., and the many forms of xanthines, alkaloids, and ptomaines.

    Nature Cure

  • In individuals of different constitutions, accumulations of uric acid, xanthines, oxalates of calcium and various other earthy substances form stones, gravel or sandy deposits in the kidneys, the gall bladder and in other parts and organs.

    Nature Cure

  • Caffeine and theobromine, the narcotic principles of coffee and tea, are xanthines; and so is the nicotine contained in tobacco.

    Nature Cure

  • Every piece of animal flesh is saturated with these excrements of the cells in the form of uric acid and many other kinds of acids, alkaloids of putrefaction, xanthines, ptomaines, etc. The organism of the meat eater must dispose not only of its own impurities produced in the processes of digestion and of cell metabolism, but also of the morbid substances that are already contained in the animal flesh.

    Nature Cure

  • I have repeatedly stated that xanthines have the same effect upon the system as uric acid.

    Nature Cure


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