Figure 2: Titration curves of pH buffer supplements. Different supplements commercially available were tested as candidates for pH buffering therapy. Each supplement was re-suspended in distilled water and titrated using HCl (1N) from its original pH down to pH 2.0. The amounts of supplement and volumes of distilled water were 1g/150mL for Spirulina, 1g/150mL for sodium bicarbonate, 1g/150mL for lysine (free base), 1.52g/150mL for lysine (GNC), 50g/150mL whey protein, 1g/150mL for lysine monohydrochloride, 2.58g/150mL for Tums, and 4g/50mL for peptone. L-lysine free base and calcium carbonate are the best substitutes for sodium bicarbonate.