Scientific Names: Eleutherococcus senticosus, (synonyms: Acanthopanax senticosus, Herdera senticosa)
Other Common Names: Siberian or thorny ginseng, eleuthero, Taiga root, thorny Ussurian pepperbush, devil’s shrub, wild pepper, touch-me-not
Overall Safety: 😐
Therapeutic Efficacy and Considerations:
Athletic Performance: 🙁 Results of studies examining effects on muscle strength and aerobic performance have been contradictory. Only one very small study found any benefit on oxygen uptake or recovery time and only small increases in strength in some of the muscle groups tested. Two other trials found no difference from placebo on any outcomes. Evidence does not support use of eleutherococcus for athletic performance.
Stress Adaptation: 😐 One trial, using an unknown amount and type of eleutherococcus extract demonstrated some improvements in cardiovascular responses to stress in a laboratory-based stress-inducing exercise. More research is warranted, but until more is known about clinically significant effects, as well as effective dose and formulation, eleutherococcus cannot be recommended for this indication.
Herpes Simplex II: 😐 One trial has compared an eleutherococcus root extract to placebo for the prevention of recurrent Herpes simplex II infections and noted a decrease in the frequency of outbreaks and the severity of symptoms. Some major methodological considerations limit confidence in the results. More research is warranted, but the current evidence is not sufficient to recommend eleutherococcus for this indication.
Chronic Fatigue: 😐 One trial compared a standardized powered extract eleutherococcus to placebo for treatment of chronic fatigue; no significant improvement over placebo was seen. There was a statistically significant improvement from baseline in patients with moderate fatigue, so further research may be warranted. However, current evidence does not support the use of eleutherococcus in managing chronic fatigue.
Chemistry/Pharmacology:
The primary components of eleutherococcus are multiple eleutherosides, which actually are several different types of chemicals such as beta-sitosterol and other sterols, saponins, lignans, coumarins, and others. Eleutherosides B and E are the most abundant and are standard marker compounds in products. Individually, the components have many opposing effects. The whole root or whole root extracts can have variable effects such as hyper- and hypotension, CNS stimulation, and sedation, or hyper- o and hypoglycemia (a predominance of hyperglycemia was seen in one study). Effects that predominate may be dependent on the individual’s underlying status, which fits with eleutherococcus’ traditional use as an adaptogen – a substance that helps to” normalize” both under-active and over-active body functions. Binding to estrogen receptors occurs, and there may be binding to glucocorticoid, mineralocorticoid, and progestin receptors to a lesser extent. Immunological effects include stimulation of macrophages, T-lymphocyte proliferation, and activation of T-cells and killer cells. Other proposed actions for certain constituents include antioxidant, anticancer effects, ultraviolet light protection, inhibition of platelet aggregation, antihistamine, anti-inflammatory, and diuretic actions. Because so many studies have provided conflicting results, it cannot be said that any activities are well-characterized.
Drug Interactions:
Anticoagulants/antiplatelet agents (due to increased risk of bleeding), digoxin (due to possible increased levels), hexobarbital (inhibited metabolism, avoid concomitant use), stimulants such as caffeine, ephedra, or others (due to increased HTN and CNS stimulation), vitamins B1, B2, and C (increased excretion, avoid concomitant use), EtOH, CNS depressants, and hypoglycemic agents (due to possible increased effects). Substrates of cytochrome P4501A2, 2C9, 3A4, and 2D6 (due to possible enzyme inhibition), although at recommended doses does not appear to inhibit or induce cytochrome P4503A4 or P4502D6. May increase the actions of kanamycin.
Contraindications/Precautions:
Pregnancy/lactation/children (due to unknown effects), cardiovascular disorders and hypertension (due to cardiovascular stimulatory effects), hormone-sensitive cancers (due to estrogenic effects). May exacerbate mania and schizophrenia so generally avoided in these patients. Use for longer than three weeks is not recommended, but it has been used safely for up to two months.
Adverse Effects:
Generally well tolerated; reported effects include decreased coagulation, hypertension, tachycardia, diarrhea, euphoria, agitation, decreased concentration, dizziness, anxiety, insomnia, slight drowsiness, restlessness, rash, estrogenic effects (breast pain and vaginal bleeding). Long term use can lead to an inflamed sciatic nerve causing muscle spasms.