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POSSIBLY EFFECTIVE

• Genital herpes. Oral eleuthero root extract might help to prevent and reduce the severity of genital herpes outbreaks. Details: One clinical study in patients with recurrent genital herpes infections shows that taking a specific eleuthero root extract (Elagen) 400 mg, standardized to contain eleutheroside 0.3%, daily for at least 3 months reduces the frequency, severity, and duration of outbreaks when compared with placebo (730).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Athletic performance. Small clinical studies suggest that oral eleuthero root is not beneficial for improving athletic performance. Details: One study in trained distance runners shows that a specific eleuthero root liquid extract, standardized to eleutherosides B and E content, taken as 3.4 mL daily for 6 weeks, does not affect endurance, performance, or psychological, cardiac, or respiratory parameters when compared with placebo (7522). Small studies in trained athletes or healthy adults show that taking eleuthero 800-1200 mg daily (Endurox) for 1-6 weeks does not seem to have any effect on cycling performance time, respiration, lactate production, or heart rate recovery during cycling, stair-stepping exercise, treadmill, or cyclic ergometry when compared with placebo (2335,7600,7601,8994). However, there has been some speculation that a longer duration of supplementation is needed for benefit. One study in recreationally trained athletes shows that taking a specific powdered eleuthero root product 400 mg twice daily for 8 weeks increased cycling endurance time by 23% and maximal oxygen consumption by 12% when compared with placebo. This product was standardized to contain eleutheroside B 0.11% and eleutheroside E 0.12% (17186).
• Bipolar disorder. It is unclear if oral eleuthero root is beneficial for bipolar disorder. Details: A small clinical study in Chinese adolescents ages 12-17 years with bipolar disorder shows that taking eleuthero root 750 mg orally three times daily, in conjunction with lithium for 6 weeks, induces similar response rates and remission rates when compared with lithium plus fluoxetine 20 mg (75028). It is not clear how this response rate compares to the use of lithium alone.
• Cardiovascular disease (CVD). It is unclear if oral eleuthero fruit is beneficial for preventing the development of CVD. Details: One small clinical study in healthy adults with at least two cardiovascular risk factors shows that taking an aqueous extract of eleuthero fruit 500 mg daily for 12 weeks seems to modestly reduce systolic blood pressure and arterial stiffness, as measured by brachial-ankle pulse wave velocity, when compared with placebo. It did not affect diastolic blood pressure, flow-mediated dilation, or carotid intima-media thickness. Also, taking a higher 1000 mg dose of the same eleuthero extract daily did not have significant effects on any measured parameters (105025).
• Chronic fatigue syndrome (CFS). It is unclear if oral eleuthero root is beneficial for CFS. Details: One clinical study in adults with CFS shows that taking eleuthero root extract 2 grams daily for 2 months improves fatigue severity and duration when compared with baseline, but not when compared with placebo (11099).
• Cognitive function. It is unclear if oral eleuthero is beneficial for cognitive function. Details: A very small clinical study in middle-aged people shows that taking eleuthero 325 mg twice daily might improve selective memory when compared with placebo (2574). Another very small study in healthy adults shows that taking a combination product containing extracts of eleuthero leaf 203 mg and Drynaria fortunei 20 mg daily for 12 weeks improves figure recall, but not immediate memory or attention, when compared with placebo (102316). It is unclear if this effect is due to eleuthero, Drynaria fortunei, or the combination.
• Common cold. Oral eleuthero has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Some clinical research shows that taking capsules of a specific combination product containing eleuthero plus andrographis (Kan Jang, Swedish Herbal Institute) orally improves symptoms of the common cold when started within 72 hours of symptom onset. Some symptoms can improve after 2 days of treatment; however, it typically takes 4-5 days of treatment for maximal symptom relief (5784,10795,12380). Some research shows the combination of eleuthero and andrographis relieves cold symptoms better than echinacea or placebo in children (12381). It is unclear if this effect is due to eleuthero, andrographis, or the combination.
• Diabetes. It is unclear if oral eleuthero is beneficial for improving glycemic control in type 2 diabetes. Details: One small clinical study in adults with type 2 diabetes shows that taking a specific eleuthero extract, standardized to contain eleutherosides E and B 1.12%, as 480 mg daily for 3 months, decreases fasting glucose by a mean of 36 mg/dL, postprandial blood glucose by a mean of 35 mg/dL, glycated hemoglobin (HbA1c) by a mean of 0.8%, triglycerides by a mean of 106 mg/dL, and total cholesterol by a mean of 21 mg/dL when compared with placebo (91509).
• Diabetic neuropathy. It is unclear if oral eleuthero is beneficial for diabetic neuropathy. Details: One small clinical study in adults with type 2 diabetes shows that taking a specific eleuthero extract, standardized to contain eleutherosides E and B 1.12%, as 480 mg daily for 3 months, modestly improves subjective symptoms of diabetic neuropathy when compared with placebo (91509).
• Familial Mediterranean fever. Oral eleuthero has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: One small clinical study in children ages 3-15 years with familial Mediterranean fever shows that taking a specific combination product (ImmunoGuard, Inspired Nutritionals) containing eleuthero, andrographis, schisandra, and licorice for one month reduces the duration, frequency, and severity of disease recurrence when compared with placebo (12382). It is unclear if this effect is due to eleuthero, other ingredients, or the combination.
• Fibromyalgia. Although there is interest in using oral eleuthero for fibromyalgia, there is insufficient reliable information about the clinical effects of eleuthero for this condition.
• Hangover. It is unclear if oral eleuthero root is beneficial for hangovers. Details: One small clinical study in healthy males shows that consuming one bottle of a powdered polysaccharide-rich extract of eleuthero root before and after consuming alcohol modestly reduces the severity of hangover as measured by the Acute Hangover Scale questionnaire score when compared with placebo (91508). However, the validity of these findings is brought into question due to the incomplete study information provided.
• Influenza. Oral eleuthero has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research in adults with influenza shows that taking a specific combination product containing eleuthero 20-30 mg plus andrographis 178-266 mg (Kan Jang, Swedish Herbal Institute) three times daily for 3-5 days relieves symptoms more quickly than amantadine. This combination product also reduced the risk of post-influenza complications, such as sinusitis or bronchitis, when compared with amantadine (10441). It is unclear if these effects are due to eleuthero, andrographis, or the combination.
• Osteoarthritis. Oral eleuthero has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Clinical research shows that taking two capsules each containing 400 mg of a combination of eleuthero, Panax pseudoginseng, and rehmannia daily for 6 weeks improves physical function in individuals with knee osteoarthritis when compared with placebo. However, the combination does not seem to reduce pain or stiffness when compared with placebo (74950). It is unclear if this effect is due to eleuthero, other ingredients, or the combination.
• Osteoporosis. Oral eleuthero has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A very small clinical study in postmenopausal patients shows that taking low-dose calcium and vitamin D3 in combination with a 250 mg blend of rehmannia root and eleuthero stem bark extracts twice daily for 12 months attenuates the loss of spine and femur bone mineral density when compared with placebo or high-dose calcium and vitamin D (75036). It is unclear if this effect is due to eleuthero, rehmannia, or the combination.
• Pneumonia. Oral eleuthero has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research in adults with acute, nonspecific pneumonia shows that taking a specific combination product (ADAPT-232), containing eleuthero, rhodiola, and schisandra, as 20 mL twice daily for 10-15 days in conjunction with conventional treatment, reduces the duration of antibiotic treatment and improves quality of life when compared with conventional treatment alone (71152).
• Quality of life. It is unclear if oral eleuthero root improves quality of life in older healthy adults. Details: A small clinical study in elderly volunteers shows that taking eleuthero 300 mg daily improves social functioning and mental well-being after 4 weeks of treatment when compared with placebo. However, this improvement was not maintained after 8 weeks of treatment (15586).
• Rheumatoid arthritis (RA). Although there is interest in using oral eleuthero for RA, there is insufficient reliable information about the clinical effects of eleuthero for this condition.
• Stress. It is unclear if oral eleuthero root is beneficial for stress. Details: One clinical study in adults 30-50 years of age with symptoms of stress shows that taking a specific eleuthero root extract (WS 1070) 120 mg daily for 8 weeks does not improve fatigue, exhaustion, cognitive alertness, or measures of stress when taken alone or in conjunction with stress management training (91510). However, another small clinical study in healthy females 20-68 years of age who have experienced stress for a prolonged period of time shows that taking a single, 270 mg dose of a combination agent (ADAPT-232) containing eleuthero, rhodiola, and schisandra improves attention and cognitive speed and accuracy when compared with placebo (19289). It is unclear if these effects are due to eleuthero, other ingredients, or the combination.
• Upper respiratory tract infection (URTI). Oral eleuthero has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Clinical research in adults with an uncomplicated URTI shows that taking 30 mL of a combination product (Kan Jang, Swedish Herbal Institute) containing extracts of eleuthero root (eleutherosides B and E 0.03 mg/mL), echinacea root, and malabar nut leaf daily does not reduce the severity or frequency of cough by a clinically meaningful amount after 3-4 days of treatment when compared with bromhexine hydrochloride or placebo (95648). However, a non-blinded clinical study shows that taking 30 mL of this same product three times daily for 6 days improves the severity and frequency of coughing and the degree of nasal congestion when compared with bromohexine. Additionally, patients taking the combination product recovered two days sooner, on average, than those taking bromohexine (48569). The reason for these conflicting findings is unclear but may be due to an inadequate duration of treatment in the first study and/or lack of blinding in the second study. Also, it is unclear if any benefit is due to eleuthero, other ingredients, or the combination. Other research has evaluated a capsule formulation of Kan Jang (Swedish Herbal Institute), with each capsule containing eleuthero root 11.4 mg and andrographis 195 mg. One small clinical study in patients with an uncomplicated URTI shows that taking this product as two capsules three times daily for 5 days reduces the median number of sick leave days to 2 days, compared with 3 days in the placebo group. It also increases the total number of recovered patients on day 3 to 75%, compared with 55% of those taking placebo (107471). More evidence is needed to rate eleuthero for these uses.

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LIKELY SAFE ...when used orally and appropriately, short-term. Eleuthero root extract 300-2000 mg has been used safely in clinical trials lasting up to 3 months (730,1427,2574,7522,11099,15586,91509). There is insufficient reliable information available about the safety of eleuthero when used long-term.

CHILDREN: POSSIBLY SAFE
when used orally in adolescents aged 12-17 years, short-term. Eleuthero 750 mg three times daily was used for 6 weeks with apparent safety in one clinical trial (75028). There is insufficient reliable information available about the safety of eleuthero in children or adolescents when used long-term.

PREGNANCY AND LACTATION:
Insufficient reliable information available; avoid using.

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ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, eleuthero may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.  Details In vitro and animal research shows that a constituent of eleuthero, dihydroxybenzoic acid, appears to inhibit platelet aggregation (7592,74976). Concomitant use with anticoagulant or antiplatelet drugs might increase the risk of bleeding.

ANTIDIABETES DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, eleuthero might have additive effects when used with antidiabetes drugs.  Details Animal research suggests that certain constituents of eleuthero have hypoglycemic activity in both healthy and diabetic animals (7591,73535,74932,74956,74988,74990). A small study in adults with type 2 diabetes also shows that taking eleuthero for 3 months can lower blood glucose levels (91509). However, one very small study in healthy individuals shows that taking powdered eleuthero 3 grams, 40 minutes prior to a 75-gram oral glucose tolerance test, significantly increases postprandial blood glucose levels when compared with placebo (12536). These contradictory findings might be due to patient-specific variability and variability in active ingredient ratios.

CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, eleuthero might increase levels of drugs metabolized by CYP1A2.  Details In vitro and animal research suggest that standardized extracts of eleuthero inhibit CYP1A2 (7532). This effect has not been reported in humans.

CYTOCHROME P450 2C9 (CYP2C9) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, eleuthero might increase levels of drugs metabolized by CYP2C9.  Details In vitro and animal research suggest that standardized extracts of eleuthero might inhibit CYP2C9 (7532). This effect has not been reported in humans.

CYTOCHROME P450 2D6 (CYP2D6) SUBSTRATES Interaction Rating = Minor Be watchful with this combination. Severity = Moderate •  Occurrence = Unlikely •  Level of Evidence = B Theoretically, eleuthero might increase levels of drugs metabolized by CYP2D6.  Details In vitro and animal research suggest that standardized extracts of eleuthero might inhibit CYP2D6. However, research in healthy human volunteers has found that taking eleuthero 485 mg twice daily for 14 days does not inhibit CYP2D6 drug metabolism (7532,10400).

CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES Interaction Rating = Minor Be watchful with this combination. Severity = Moderate •  Occurrence = Unlikely •  Level of Evidence = B Theoretically, eleuthero might increase levels of drugs metabolized by CYP3A4.  Details In vitro and animal research suggest that standardized extracts of eleuthero might inhibit CYP3A4. However, research in healthy human volunteers has found that taking eleuthero 485 mg twice daily for 14 days does not inhibit CYP3A4 drug metabolism (7532,10400).

DIGOXIN (Lanoxin) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Unlikely •  Level of Evidence = D Eleuthero might increase serum digoxin levels and increase the risk of side effects.  Details In one case report, a 74-year-old male who was stabilized on digoxin presented with an elevated serum digoxin level after starting an eleuthero supplement, without symptoms of toxicity. After stopping the supplement, serum digoxin levels returned to normal (543). It is not clear whether this was due to a pharmacokinetic interaction or to interference with the digoxin assay (15585). Although the product was found to be free of digoxin and digitoxin (543), it was not tested for other contaminants (797).

IMMUNOSUPPRESSANTS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, eleuthero might interfere with immunosuppressive drugs because of its immunostimulant activity.  Details Animal and in vitro research shows that eleuthero extracts have immunomodulatory effects, including increasing cellular and humoral activity (74887,74915).

ORGANIC ANION-TRANSPORTING POLYPEPTIDE SUBSTRATES (OATP) Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = D Theoretically, eleuthero might decrease levels of drugs metabolized by OATP.  Details In vitro research suggests that eleuthero inhibits OATP2B1, which might reduce the bioavailability of oral drugs that are substrates of OATP2B1 (35450). Due to the weak inhibitory effect identified in this study, this interaction is not likely to be clinically significant.

P-GLYCOPROTEIN SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, eleuthero might increase levels of P-glycoprotein substrates.  Details In vitro research suggests that eleuthero can inhibit the multi-drug transporter protein, P-glycoprotein (22639,91509). However, it is too soon to tell if this is clinically important. This interaction has not been reported in humans.

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General ...Orally, eleuthero root is generally well tolerated when used short-term.
Most Common Adverse Effects:
Orally: Diarrhea, dyspepsia, gastrointestinal upset, headache, nausea, and urticaria.

Cardiovascular ...Orally, increased blood pressure has been reported in children with hypotension taking eleuthero in one clinical study (74980). Eleuthero has been reported to cause tachycardia, hypertension, and pericardial pain in patients with rheumatic heart disease or atherosclerosis. It is unclear if these effects were caused by eleuthero, or by the cardioglycoside-containing herb, silk vine (Periploca sepium), which is a common adulterant found in eleuthero products (12,797,6500).

Dermatologic ...Orally, eleuthero has been reported to cause rash in some clinical studies (75013,75028).

Gastrointestinal ...Orally, eleuthero has been reported to cause dyspepsia, nausea, diarrhea, and gastrointestinal upset in some patients (74938,75028,91510).

Genitourinary ...Orally, mastalgia and uterine bleeding were reported in 7. 3% of females taking eleuthero 2 grams daily in one clinical study (6500,11099). These adverse effects seem to be more likely with higher doses.

Neurologic/CNS ...Orally, headaches have been reported in 9. 8% of people taking eleuthero in one clinical study (11099).
In one case report, a 53-year-old female developed spontaneous subarachnoid hemorrhage associated with the use of an herbal supplement containing red clover, dong quai, and eleuthero (70419). It is unclear if this event was related to the use of eleuthero, the other ingredients, the combination, or another cause entirely.

Psychiatric ...Orally, nervousness has been reported in 7. 3% of people taking eleuthero in one clinical study (11099). Eleuthero has also been reported to cause slight anxiety, irritability, and melancholy in some patients (6500,11099). These adverse effects seem to be more likely to occur with higher doses.

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