Yavelle Journal · Getting Started · 5 min read
Deuterium is a naturally occurring heavy isotope of hydrogen, measured in parts per million (ppm). Your body is mostly water, and that water carries a deuterium level just like any other water does. Testing simply reads that level, turning something invisible into a number.
Yes, Your Own Level Can Be Measured
Deuterium in body samples is measured by isotope ratio analysis in a laboratory — the same class of technique used to measure the deuterium content of drinking water. Commercial mail-in kits exist for this, mostly offered by laboratories and organisations based in the United States. Results are reported in parts per million, the same unit used for water.
Yavelle does not sell, supply or receive any benefit from deuterium testing, and describing it here is not a recommendation of any provider. These tests measure an isotope ratio. They are not diagnostic tests and are not used to identify, monitor or rule out any medical condition.
What the Samples Are
Deuterium testing typically uses more than one kind of sample:
- Saliva or urine — body fluid samples, collected at home.
- Breath — a breath sample, also collected at home.
Providers describe these sample types as measuring somewhat different things. We have not found published work establishing what a breath measurement adds over a fluid one, so we are not going to tell you what each sample means. Collection is designed to be simple and done at home, and the sample is then sent to a laboratory for analysis.
Reading the Result
Results are reported in parts per million, which makes the scale easy to place. Ocean water, the international reference standard, sits at 155.76 ppm. Industrially produced deuterium-depleted water is made at concentrations as low as 25 ppm. A personal result is read against that scale.
What a given number means beyond that is where honesty is required. There is no established reference range for deuterium in body water in the way there is for something like blood glucose, and no threshold that has been shown to correspond to anything in particular. A result is a measurement. It is not an assessment of your health, and nobody should present it to you as one.
How People Use Testing
The most common pattern is simple. Someone tests once to establish a baseline, then tests again at a later point. For data-minded people, having a figure makes an abstract idea concrete. Others prefer to test periodically simply to have the record.
Do You Actually Need to Test?
No. Testing is entirely optional, and plenty of people never do it. You do not need a number to start drinking deuterium-depleted water or to eat a low deuterium diet. Testing appeals mainly to those who enjoy tracking and want to see a figure in black and white. If that is you, it is a satisfying way to make the invisible visible. If it is not, you can simply get on with the water and the food.
The Bottom Line
Your own deuterium level can be measured, not just the level in your water. Isotope analysis of breath, saliva or urine reports the result in ppm, so you can place a baseline on the same scale used for water. It is optional, it is not a medical test, and the number on its own does not carry an established meaning — but for anyone who likes data it turns deuterium from an abstract idea into something measurable.
Where to Go Next
For the science of how deuterium is measured in a laboratory, see our article on isotope testing, and for the reference point behind these numbers, our explainer on the VSMOW water standard.
A note on the reference figure. The 155.76 ppm value quoted above is that of VSMOW2 (Vienna Standard Mean Ocean Water 2), the isotopic reference material maintained jointly by the International Atomic Energy Agency and the National Institute of Standards and Technology.
This article is for educational purposes and describes how deuterium testing works. Yavelle is not affiliated with, and receives no benefit from, any testing provider.
Yavelle 25ppm Deuterium-Depleted Water is a packaged food. It is not a therapeutic good and is not intended to diagnose, treat, cure or prevent any disease. Information on this page is general and is not medical advice. If you have a health condition or are undergoing treatment, speak with a qualified health practitioner.