Deuterium-depleted water (often shortened to DDW) is drinking water with a lower concentration of deuterium than what’s found in typical water.
This page explains what deuterium-depleted water is, how it’s measured (ppm), how it differs from distilled or purified water, how it’s made, and how people typically use it.
Yavelle is a beverage. It is not a therapeutic good, it is not registered as one in any territory, and no health claims are made for it. This page is educational and is not medical advice.
What is deuterium?
Deuterium (symbol: D or ²H) is a naturally occurring, stable isotope of hydrogen. Most hydrogen atoms have one proton and no neutrons (¹H). Deuterium has one proton and one neutron, making it twice as heavy.
Because hydrogen is a building block in water and many biological molecules, deuterium is naturally present throughout the environment. When deuterium is part of a water molecule, you may see it described as:
HDO (one normal hydrogen and one deuterium)
D₂O (two deuterium atoms; often called “heavy water” in scientific
contexts)
In everyday drinking water, most molecules are still H₂O, but a small fraction contains deuterium.
What is deuterium-depleted water?
Deuterium-depleted water is water that has been processed to reduce the deuterium concentration below typical natural levels. You’ll also see it called:
- low deuterium water
- DDW water
- deuterium-reduced water
- light water
The defining feature is not a flavour, mineral blend, or additive. It’s the deuterium level, usually shown as ppm (parts per million).
Deuterium levels in water (ppm): what the numbers mean
DDW products are commonly labelled by their deuterium content in parts per million (ppm). PPM is a standard way to express very small concentrations.
You’ll often see:
- ~150 ppm: a commonly cited natural level – often given as an average for tap or ocean water
- 105 ppm / 85 ppm / 65 ppm /: popular DDW ranges
- 25 ppm: very low deuterium water
A simple way to interpret it: lower ppm = lower deuterium concentration.
Heavy water vs deuterium-depleted water
These terms get mixed up online, so it helps to separate them:
- Heavy water (D₂O): water with a higher proportion of deuterium; used in scientific and industrial applications.
- Regular water: typical drinking water with naturally occurring deuterium.
- Deuterium-depleted water (DDW): water with less deuterium than typical natural water.
So DDW is essentially the opposite direction from heavy water.
Is DDW the same as distilled water?
No. Distilled water is purified by distillation to remove minerals and many impurities. Deuterium-depleted water is processed specifically to reduce deuterium concentration.
Some DDW products may also be low in minerals (depending on production method), but the key differentiator is deuterium ppm.
How is deuterium-depleted water made?
Producing DDW requires specialised processes because deuterium is part of the water molecule itself. DDW is typically produced using methods that
separate molecules based on small differences in physical properties.
Commonly discussed approaches include:
- Fractional distillation (leveraging slight differences in boiling points)
- Multi-stage separation
processes designed to reduce deuterium content - Blending different water fractions to reach a target ppm
Because the separation is subtle and requires multiple stages, DDW is usually more expensive than standard bottled water.
Why do people use deuterium-depleted water?
People explore DDW for different reasons, usually within broader wellness routines.
Some track a great deal about their health and have realised this is one variable nobody has ever measured for them. Some find the idea interesting and want to try it. Some simply prefer clean, minimalist hydration with no sweeteners or stimulants.
Our research page lists the published literature alongside the published criticism of it, with links to primary sources.
How do people typically drink DDW?
There is no protocol and no amount you are meant to reach. Most people drink it alongside their normal water rather than instead of it, and when they drink it is entirely preference.
Bear in mind that mixing it with ordinary water raises the average concentration in direct proportion to volume. Our intake calculator works that out.
Please see our detailed intake page for more information on what may work best for you.
How to choose a deuterium-depleted water product
If you’re comparing DDW brands or deciding whether to try it, focus on practical quality signals.
1) Clear ppm labeling
You should be able to see the deuterium level clearly (for example 25ppm, 65 ppm, 85 ppm, 105 ppm). Avoid products that are vague about ppm.
2) Testing and transparency
Look for:
- Batch testing information
- Third-party lab testing (where
available) - Clear sourcing and production
standards
3) Packaging and storage
Consider:
- Heat exposure during shipping
- Storage time at home
- PET vs glass preferences
4) Taste and consistency
Some people notice differences in taste between brands and ppm levels. Consistency matters if you’re tracking your routine.
5) Reliability and Supply
Unfortunately, there are only a handful of quality producers of DDW in the world. This has often led to supply issues. Additionally, the water may
be shipped very slowly from overseas at great expense to you. It is best to be sure your supplier can provide a consistent supply long term,...especially if you intend to drink it regularly.
Frequently asked questions (FAQ)
Does DDW taste different?
Some people report subtle differences in mouthfeel or taste, while others notice no difference. Taste can depend on mineral content, packaging, and storage conditions.
Is DDW safe?
DDW is water with reduced deuterium concentration. As with any dietary change, if you have medical conditions or concerns, consult a qualified healthcare professional.
Can I make deuterium-depleted water at home?
Not realistically. Achieving specific ppm levels requires specialised equipment and multi-stage processing.
What do the different ppm levels mean?
The number is the deuterium concentration. Ordinary water sits around 150 parts per million, and commercially available DDW ranges from about 105 down to 25. Lower ppm requires more separation stages, which is why it costs more. Which one you buy is a question of preference and budget.
Final summary: DDW in plain English
Deuterium-depleted water is simply water with less deuterium than typical natural drinking water. It’s measured in ppm, often sold in ranges like 105 ppm, 85 ppm, 65 ppm, and 25 ppm.