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.
Disclaimer: This content is for educational purposes only and is not medical
advice. Deuterium-depleted water is not intended to diagnose, treat, cure, or
prevent any disease.
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. Common motivations include:
- A desire to assist their mitochondria and metabolic efficiency
- As a result of reading the extensive research into DDW and cancer protocols
- To explore the published research on deuterium and physical performance
- A desire for clean, minimalist hydration (no sweeteners, no stimulants)
Please see our scientific research for more information on potential uses for DDW
How do people typically drink DDW?
There’s no single universal protocol. Common use patterns include:
- Replacing part of daily water intake (e.g., 250–1000 mL/day depending on preference)
- Morning hydration as the first drink of the day
- Training hydration before/after workouts
- Cycling different ppm levels over time
Please see our detailed dosage 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 25 ppm, 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 are dependent on it to assist chronic or long-term conditions.
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 ppm should I start with?
Many people start with a moderate ppm (for example, 85–105 ppm) and adjust based on preference and budget. There is no one-size-fits-all answer.
Lower pp, water can be diluted to achieve higher concentrations, and this is often a cost-effective solution.
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.
Footer disclaimer: This page is for educational purposes only and does not provide medical advice.
Deuterium-depleted water is not intended to diagnose, treat, cure, or prevent any disease.