Ordinary water with much of its heavy hydrogen removed. The strongest signal is as an add-on in cancer care, though human evidence is thin and largely from sellers. Benefits for blood sugar, cell protection, weight, and aging rest on lab and animal work. Safe at normal intakes but costly and unproven. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Saliva/urine deuterium (ppm) | Below ~130 ppm | Confirms intake is actually lowering body deuterium |
| Fasting glucose | 75–85 mg/dL | Tracks the proposed glucose-handling benefit |
| HbA1c | <5.3% | Longer-term glucose control |
| Fasting insulin | 2–5 µIU/mL | Sensitive early marker of insulin resistance |
| hs-CRP | <1.0 mg/L | Tracks the proposed reduction in inflammation/oxidative stress |
| Basic metabolic panel with eGFR | Within normal reference range | Safety check when one water source dominates intake |
Cadence: Recheck body-fluid deuterium at ~4–6 weeks; reassess metabolic and inflammation markers every 3–6 months while use continues.