A Nitrate or Nitrite of a Betaine Compound disclosed. Also disclosed are a composition and a supplement formulation comprising at least one constituent selected from the group consisting of a Nitrate, a Nitrite, and both and a Betaine Compound. The composition and supplement formulation may be formulated to deliver an effective amount of the constituents to prevent the development of nitrate tolerances, to increase bioabsorption of amino acids, or to increase the vasodilative characteristics of amino acids in a human or animal.
