Siberian Ginseng (Eleutherococcus senticosus) is a woody shrub in the Araliaceae family, distinct from Panax ginseng despite sharing the common 'ginseng' name. Native to Russia, China, Korea, and Japan, it has been used for centuries in traditional Chinese and Russian folk medicine. It rose to modern prominence in Soviet-era sports and military research as a performance-enhancing and stress-protective botanical.

Eleuthero is classified as an adaptogen — a substance that non-specifically enhances the body's resistance to physical, chemical, and biological stressors. Its primary active compounds, the eleutherosides, are thought to modulate the hypothalamic-pituitary-adrenal (HPA) axis, normalizing cortisol output during stress and supporting adrenal reserve. Eleutheroside E and polysaccharide fractions have also demonstrated immunomodulatory activity in human studies, stimulating natural killer (NK) cell activity and cytokine production.

Standardized root extracts (0.8–1% eleutherosides) in capsule or tablet form provide the most reliable and reproducible dosing and are preferred for clinical use. Liquid tinctures (1:5 or 1:1 concentrations) offer faster absorption but variable standardization. Dried root teas are traditional but deliver lower and less predictable eleutheroside concentrations. Cycling protocols (e.g., 6–8 weeks on, 2–4 weeks off) are traditional and commonly recommended to maintain adaptogenic efficacy.

• Fatigue & Low Energy
• Athletic Endurance & Recovery
• Immune Function
• Cognitive Performance Under Stress
• Cold & Flu Prevention

• Recurrent upper respiratory tract infections (modest supportive evidence from immunomodulatory RCT data)
• Exercise-induced immune suppression in athletes (proposed based on NK cell and lymphocyte activation data)

• Insomnia or sleep disturbance (particularly when taken late in the day or at high doses)
• Mild agitation or nervousness
• Headache
• Elevated blood pressure (reported at high doses; monitor in hypertensive individuals)
• Mild gastrointestinal upset (nausea, diarrhea) — uncommon
• Potential interference with laboratory digoxin immunoassay testing
• Palpitations (rare, typically at excessive doses)

• Recommended daily: 300–1200 mg/day of standardized dry root extract (standardized to 0.8–1% eleutherosides); most clinical studies have used 300–800 mg/day in divided doses. Liquid extracts: 10–30 mL/day of 1:5 tincture.
• Best time of day: Morning or early afternoon; avoid evening dosing due to mild stimulant properties that may interfere with sleep
• With or without food: Can be taken with or without food; taking with food may reduce risk of mild gastrointestinal discomfort in sensitive individuals
• Time to effect: 4–8 weeks of consistent daily use for most reported adaptogenic, fatigue, and immune benefits
• How long to take it: Traditional and research-supported cycling protocol: 6–8 weeks continuous use followed by a 2–4 week break before resuming. Not recommended for continuous long-term use without breaks due to limited long-term safety data.