Gou-teng for Health & Longevity - Quick Reference Sheet
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Gou-teng for Health & Longevity

Created on 08/25/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 5 – Audit

Gou-teng's compounds widen blood vessels and act on a brain receptor governing arousal. The strongest, repeatedly confirmed effect is reduced agitation, aggression, and hallucinations in dementia. Evidence on added blood-pressure lowering is contradictory, and claims about protecting brain cells rest on cells and animals. The main harm, potassium loss, comes from licorice in the common formulas, not the herb. (Full Review)

Protocol

Crude herb decoction
3–12 g/day
Dried hooked stem, decocted in water, taken in two divided portions
Concentrated granule, single herb
1.2 g twice daily
The only regimen tested against placebo as monotherapy; 16 weeks in adults aged 65 and over
Late addition to the decoction
Final 10–20 minutes
Prolonged heat degrades the alkaloids; the single best-known preparation rule for the herb
Time to effect
Behavioural symptoms
4–12 weeks
Agitation and related symptoms improved over this window in trials
Blood pressure
2–4 weeks
Blood-pressure change appears within this window
Cognition
16 weeks
The realistic horizon for any cognitive signal; the trial's primary outcome was measured here

Benefits

Contraindications
  • Serum potassium below 3.5 mmol/L, or a potassium-depleting drug without monitoring
  • Known liver impairment or unexplained liver-enzyme elevation above twice the upper reference limit
  • Child-Pugh Class B or C cirrhosis
  • Estimated glomerular filtration rate below 30 mL/min/1.73 m²
  • Resting heart rate below 50 beats per minute, second- or third-degree heart block, or unpaced sick sinus syndrome
  • Systolic blood pressure below 100 mmHg, or a history of symptomatic orthostatic hypotension
  • Warfarin or a direct oral anticoagulant
  • Digoxin, when the preparation contains licorice
  • Pregnancy, breastfeeding, and anyone under 18
  • Known allergy to Rubiaceae-family plants
    •
Key Interactions
  • Antihypertensives (amlodipine, lisinopril, losartan)
  • Rate-slowing cardiac drugs (verapamil, diltiazem, digoxin)
  • Diuretics and corticosteroids (furosemide, prednisolone)
  • Antiplatelets (aspirin, clopidogrel)
  • CYP3A4 substrates with narrow safety margins (tacrolimus, ciclosporin, simvastatin)
  • Central nervous system depressants (lorazepam, zolpidem, opioids)
  • Over-the-counter analgesics (ibuprofen, naproxen)
  • Blood-pressure-lowering supplements (dietary nitrate, hibiscus, magnesium)
  • Sedating supplements (valerian, kava, melatonin)
  • Licorice root supplements
  • Other Chinese herbal formulas
    •

Risk & Side Effects

  • High: Pseudoaldosteronism and low potassium from licorice-containing formulas
  • Medium: Drug-induced liver injury
    •
  • Low: Excessive blood pressure drop and slowed heart rate; sedation and daytime drowsiness; gastrointestinal upset and reduced appetite
  • Speculative: Increased bleeding risk with antiplatelet or anticoagulant therapy; herb–drug interaction via liver enzymes and efflux pumps

Monitoring

Marker Target Why
Serum potassium 4.2–4.8 mmol/L Detects pseudoaldosteronism before symptoms
Blood pressure, home seated Below 120/75 mmHg The intended effect and the likeliest overshoot
Resting heart rate 55–70 beats per minute Alkaloids slow cardiac conduction; bradycardia is the dose-limiting cardiac effect
ALT and AST ALT below 25 U/L in men, below 20 U/L in women; AST below 25 U/L Liver injury is the least quantified serious risk
eGFR Above 90 mL/min/1.73 m² Kidney function governs potassium handling and alkaloid clearance
Serum magnesium 2.0–2.5 mg/dL Magnesium depletion makes potassium loss resistant to correction
Plasma renin activity and aldosterone No established target for this herb; track the direction of change from the individual's own baseline Distinguishes licorice effect from other causes of potassium loss
Cognitive screen 26/30 or above Anchors any claimed cognitive benefit to a measurement

Cadence: Baseline before the first dose, with blood pressure and resting heart rate recorded across a full week; potassium and blood pressure at 4 weeks, liver enzymes at 8 weeks, then the full panel at 6 months and every 6–12 months after. Potassium every 4 weeks for 3 months on a licorice-containing formula, a diuretic, or a corticosteroid.

Qualitative Assessment

  • Agitation and irritability — the outcome with the strongest trial support
  • Sleep continuity — night wakings and time to fall asleep
  • Daytime alertness — the earliest sign of over-sedation
  • Muscle weakness or cramping — the first symptom of falling potassium
  • Dizziness on standing — signals blood-pressure overshoot
Not medical advice. Educational distillation of a single evidence review. Confirm any decision with a qualified clinician, especially in the presence of prescription drugs or chronic conditions.