120 Besides drinking water, Enagic's machines produce four other types of water. Enagic recommends using very acidic "sanitary water" for household disinfecting, such as sanitizing cutting boards and knives. "Beauty water" helps close facial pores after washing with it, the company says. Neutral water is intended for taking medications and making baby formula; and "strong" Kangen water, a very alkaline water, is intended for "cleansing power" in such tasks as removing toilet stains or floor stains.
, Some doctors and scientists say the companies' claims aren't backed by good high-quality studies. "Human evidence is lacking, safety profile is lacking and it's very expensive," says Catherine Ulbricht, co-founder of National Standard Research Collaboration, a Cambridge, Mass. scientist-owned group that evaluates natural therapies. "There is no basis for any health claims at all" for alkaline drinking water, adds Santa Barbara, Calif., gastroenterologist John Petrini, past president of the American Society for Gastrointestinal Endoscopy. After it is digested, food and water goes into the stomach and—no matter what pH it was when it entered—ends up leaving the stomach at a pH of about 6.8, Dr. Petrini says. And no matter what you eat, your body has effective mechanisms to keep your blood in a narrow range between 7.35 and 7.45, he adds. Chemists say it's logical that acidic or very alkaline water could be useful for cleaning, but there's no evidence that the pH of water has any specific effect on skin or pores, says Washington, D.C., dermatologist Tina Alster.