Hydrogen Water PPB: The Simple 1,600 Limit You Need

Hydrogen water ppb is the number every brand puts on the box, and it is the number most buyers compare. It is worth understanding, because it has a hard physical ceiling and because it only tells you half the story.

Written by the engineering team at BioNatural Co., Ltd. (Ionfarms), a Korean manufacturer of hydrogen water devices since 2001. This article is about measurement and dose, not health claims. The H2CAP PLUS is not a medical device.

What Does Hydrogen Water PPB Actually Mean?

Hydrogen water ppb means parts per billion of dissolved hydrogen. One ppb is one microgram of H2 in a litre of water, so 1,500 ppb is 1.5 milligrams per litre. You will also see the same thing written as ppm or mg/L, where 1.5 mg/L equals 1,500 ppb. Different units, identical amount.

That unit confusion is the first thing to clear up when comparing products. A bottle claiming 1.5 ppm and a bottle claiming 1,500 ppb are claiming exactly the same concentration.

How Many PPB Is Good for Hydrogen Water?

There is no regulatory minimum for hydrogen water ppb and no officially defined effective level. What exists is a range that research has actually used. Drinking studies have generally worked somewhere between about 500 and 1,600 ppb, with many landing near the saturation point.

The upper end of that band is not a marketing choice. It is a physical limit.

Why Is 1,600 the Hydrogen Water PPB Ceiling?

Henry's law describes how much of a gas a liquid can hold at a given pressure. For hydrogen in water at sea level and room temperature, that works out to about 1.6 mg/L, which is 1,600 ppb. Above that, plain water simply cannot hold more at normal pressure.

This is why a claim of 5,000 or 8,000 ppb deserves a question rather than an assumption. Sometimes the number describes water under pressure, or a reading taken at the instant of generation before the gas escapes. Neither is the same as what reaches your mouth.

Why Hydrogen Water PPB Alone Does Not Tell You the Dose

Dose is concentration multiplied by volume. A single 500 mL bottle at 1,500 ppb contains about 0.75 mg of hydrogen. That is the honest arithmetic, and it changes how the number on the box should be read.

Compare that with a clinical trial. The 24-week metabolic syndrome study used more than 5.5 millimoles of H2 per day, which is roughly 11 mg. Reaching that from ordinary water at 1,500 ppb would take about seven litres a day, which is why that trial used supersaturated tablets rather than a bottle. We compare the two routes directly in hydrogen tablets vs a hydrogen water bottle.

How Should You Read a Hydrogen Water PPB Claim?

Four questions separate a measured hydrogen water ppb number from a marketing number.

What Does the H2CAP PLUS Measure?

The hydrogen water ppb range is 1,000 to 1,500 after a full cycle, depending on water temperature, mineral content and bottle volume. A third-party test in Japan recorded 1,036 ppb in 2018. We publish the range rather than the single best reading, because a single best reading is not what you get on a normal day.

If you want to check any device yourself, including ours, the method matters more than the meter. We cover it on the page about dissolved hydrogen measurement, and the related question of how long hydrogen water lasts explains why the timing of the reading changes the result.

The concentration a device can reach also depends on how its cell is built, which is where the SPE vs PEM question comes in - and why it is usually the wrong question.

Frequently Asked Questions

The Short Answer

How many ppb is good for hydrogen water? Somewhere in the range research has used, which is roughly 500 to 1,600 ppb, measured at the moment you drink. Anything above 1,600 ppb needs an explanation, and any single hydrogen water ppb figure needs a volume beside it before it means anything.