Oregano oil is a concentrated extract of a common cooking herb that reliably slows growth of many bacteria, yeasts, and fungi — though mostly in laboratory tests. Its most believable human use is inside the gut. Generally well tolerated when diluted and taken with food, it is a modest, short-course gut option whose broader longevity value stays unproven. (Full Review)
| Marker | Target | Why |
|---|---|---|
| ALT | 10–26 U/L | Liver stress from high-dose or prolonged use |
| Fasting glucose | 75–86 mg/dL | Excessive blood-sugar lowering with antidiabetic drugs |
| HbA1c | 4.8–5.2% | Average blood sugar for metabolic goals |
| Ferritin | 50–150 ng/mL (men), 30–120 (women) | Reduced iron stores when taken with meals or iron |
| hs-CRP | <1.0 mg/L | Inflammation context; helps interpret ferritin |
Cadence: Baseline for at-risk users; recheck at end of course (~4–6 weeks); every 6–12 months if use is recurrent