If discussing body functions disturbs you do not read any further.
At Ironman Louisville I met Murray outside the race expo. He had set up a ‘gorilla marketing’ booth on the street corner to sell his pH balancing pills called ‘Extreme Endurance’. My wife Lis and I stopped and chatted and she (as the nurse and medical boffin in the family) got into a deep discussion with Murray and his assistant. The basic theory they explained is that during exercise, especially extreme races like Ironman, the body goes acidic due to the use of muscle glycogen which produces lactic and pyruvic acids. Their pills work against this by releasing acid buffers into the small intestine.