A century-old procedure exposing a small share of blood to ultraviolet light to nudge the immune system. Laboratory and historical work suggest it can shift immune activity, but no modern high-quality human trials confirm benefits for health, resilience, or longevity. Risks are manageable but real, and some people should avoid it entirely. An experimental option. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Complete Blood Count (hemoglobin) | ~13.5–15 g/dL (men), ~12.5–14 g/dL (women) | Detect anemia or red-cell loss and track white-cell shifts |
| Haptoglobin | ~50–150 mg/dL | Low levels flag red-cell breakdown (hemolysis) from oxidative dosing |
| Lactate Dehydrogenase (LDH) | ~140–200 U/L | Rises with cell / red-cell damage |
| hs-CRP | < 1.0 mg/L | Track systemic inflammation response over a course |
| Erythrocyte Sedimentation Rate (ESR) | < 10–15 mm/hr | Secondary, slower marker of inflammation |
| G6PD activity | Within lab reference | Screen for deficiency that raises hemolysis risk |
Cadence: Baseline before starting; recheck after the first session or two, again at the end of a course (~4–8 weeks), then every 6–12 months if maintenance continues