A nutrient-dense citrus fruit supplying vitamin C, fiber, and potassium, with modest blood-pressure benefit and cholesterol improvement in those starting high. Effects on weight and blood sugar are small and inconsistent. The decisive issue is not benefit but its strong, days-long ability to raise or lower blood levels of many common medicines. (Full Review)
| Marker | Target | Why |
|---|---|---|
| LDL cholesterol | < 100 mg/dL (< 70 if high CV risk) | Tracks any lipid-lowering effect |
| Triglycerides | < 80 mg/dL | Responsive to fiber and flavonoid effects |
| Blood pressure | < 120/80 mmHg | Primary measurable benefit in pooled trials |
| Fasting glucose | 70–85 mg/dL | Screens glycemic response |
| HbA1c | < 5.3% | Reflects 3-month average blood sugar |
| hs-CRP | < 1.0 mg/L | Gauges any anti-inflammatory effect |
| Serum potassium | 4.0–4.5 mmol/L | Relevant when combined with blood-pressure agents |
Cadence: 8–12 weeks after establishing regular intake, then every 6–12 months; more frequent when combined with blood-pressure- or glucose-lowering agents.