Sumac is a food first and a supplement second. Gram-scale daily doses modestly improve blood fats, blood sugar handling, the lower blood-pressure number, one marker of background inflammation, and antioxidant defences. The changes are real but small. Practical cautions: overlap with blood-sugar and blood-pressure medicines, tannin interference with iron uptake, and reactions in people sensitive to cashew and mango. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Fasting glucose | 75–86 mg/dL | Primary glycemic endpoint |
| Glycated hemoglobin | 4.8–5.2% | Three-month glucose average |
| Fasting insulin | 2–5 µIU/mL | Detects insulin resistance before glucose rises |
| HOMA-IR | Below 1.0 | Calculated index of insulin resistance |
| Low-density lipoprotein cholesterol | 70–100 mg/dL | Primary lipid endpoint |
| Apolipoprotein B | Below 80 mg/dL | Counts atherogenic particles directly |
| Triglycerides | Below 80 mg/dL | Responds fastest to dietary polyphenols |
| High-density lipoprotein cholesterol | 50–80 mg/dL | The component sumac raises most consistently |
| High-sensitivity C-reactive protein | Below 0.5 mg/L | Background inflammation |
| Ferritin | 50–100 ng/mL | Detects tannin-driven iron depletion |
| Hemoglobin | 13.5–15.0 g/dL (women), 14.0–16.5 g/dL (men) | Confirms iron interference has not become anemia |
| Alanine aminotransferase | Below 20 U/L (women), below 25 U/L (men) | Liver response in fatty liver disease |
| Diastolic blood pressure | 70–80 mmHg | The pressure component sumac moves |
| Uric acid | 3.5–5.5 mg/dL | Sumac's only registered non-metabolic endpoint |
Cadence: Blood pressure weekly for the first four weeks, then monthly. Glucose self-monitored daily for four weeks by anyone on glucose-lowering medication. Full laboratory panel at 12 weeks, then every 6–12 months, with ferritin and hemoglobin repeated at 6 months for menstruating women and vegetarians.