Ketone supplements reliably create a fuel state on demand without fasting or low-carb eating. Human evidence is early: they briefly lower blood sugar, curb appetite, and may aid the failing heart or aging brain, but not endurance. Longevity claims rest on animal work. Main downsides: stomach upset, salt load, and diabetes-medication caution. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Capillary β-hydroxybutyrate (BHB) | ~0.5–3.0 mmol/L | Confirms a dose actually produces ketosis and guides dosing |
| Fasting glucose | ~75–90 mg/dL | Ketones lower glucose; watch for excessive drops if on medication |
| Blood pressure | <120/80 mmHg | Salts add sodium (may raise it); BHB may modestly lower it |
| Serum sodium and electrolytes | Sodium ~135–142 mmol/L | Salt-based products add a significant sodium/mineral load |
| Estimated kidney filtration (eGFR) | >90 mL/min/1.73m² | Mineral and acid loads stress the kidneys |
| Lipid panel (LDL, HDL, triglycerides) | Triglycerides <100 mg/dL; HDL >50 mg/dL | Tracks any metabolic effect of sustained use |
| HbA1c | <5.4% | Detects any longer-term change in glucose control |
Cadence: Capillary ketones and glucose around dosing initially; blood pressure, electrolytes, kidney function, and metabolic markers every 6–12 months