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There is insufficient reliable information available about the effectiveness of bayberry.

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INSUFFICIENT RELIABLE EVIDENCE to RATE

• Coronary heart disease (CHD). It is unclear if consuming black walnut as part of the diet can reduce the risk for CHD. Details: Epidemiological research has found that people who increase dietary consumption of nuts in general might have a lower risk of CHD and death due to coronary events. However, there is no available evidence showing that eating black walnut, specifically, reduces the risk of CHD (8478,13299). Still, in 2004, the US Food and Drug Administration (FDA) determined that it would allow a qualified health claim stating that consuming 1.5 ounces of walnuts per day, as part of a diet low in saturated fat and cholesterol, may reduce the risk of CHD. The FDA has concluded that this claim is based on supporting, rather than conclusive, evidence (102335).
• Wound healing. Although there is interest in using topical black walnut hull and bark for wound healing, there is insufficient reliable information about the clinical effects of black walnut for this purpose. More evidence is needed to rate the effectiveness of black walnut for these uses.

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POSSIBLY EFFECTIVE

• Ventilator-associated pneumonia (VAP). Clove mouthwash might reduce the risk of acquiring pneumonia in patients on mechanical ventilation. Details: A large clinical trial in adults in the intensive care unit on mechanical ventilation shows that administration of a clove extract 6.66% mouthwash, 15 mL twice daily for 5 days, results in a 2-fold lower incidence of ventilator-associated pneumonia when compared with chlorhexidine mouthwash (112151).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Alveolar osteitis. Although there has been interest in using topical clove for alveolar osteitis, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Anal fissures. It is unclear if topical clove oil is beneficial in patients with anal fissures. Details: Preliminary clinical research in patients with chronic anal fissures shows that applying clove oil 1% cream for 6 weeks heals fissures in 60% of patients by the 3-month follow-up, compared with only 12% of patients who used topical lidocaine 5% cream and stool softeners (43487).
• Cough. Although there has been interest in using oral clove for cough, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Dental plaque. Topical clove has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research shows that using a specific toothpaste (Sudantha, Link Natural Products Ltd.) containing a combination of clove, Acacia chundra Willd., malabar nut, bullet wood tree, black pepper, Indian beech, gall oak, Terminalia, and ginger twice daily for 12 weeks can reduce dental plaque, bleeding, and bacteria counts in the mouth when compared with placebo (43570). Other clinical research shows that administration of a mouth rinse containing clove, tea tree oil, and basil 10 mL twice daily for 21 days is as effective as a commercially available mouth rinse containing thymol, eucalyptol, menthol, and methyl salicylate in reducing dental plaque and gum inflammation (92160). It is unclear whether clove, another ingredient, or a combination of these ingredients is responsible for these effects.
• Diarrhea. Although there has been interest in using oral clove for diarrhea, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Dyspepsia. Although there has been interest in using oral clove for dyspepsia, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Flatulence. Although there has been interest in using oral clove for flatulence, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Gingivitis. Although there has been interest in using topical clove for gingivitis, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Halitosis. Although there has been interest in using oral clove for halitosis, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Hangover. It is unclear if oral clove flower extract is beneficial for reducing hangover severity. Details: Preliminary clinical research in a very small number of healthy males with a history of hangovers shows that taking a clove flower bud polyphenol extract 250 mg prior to drinking brandy (42.8% alcohol) decreases hangover severity scores by around 55% when compared with placebo (100597).
• Hyperhidrosis. It is unclear if topical clove oil is beneficial in patients with hyperhidrosis. Details: Preliminary clinical research in patients with hyperhidrosis of the palms shows that topical application of clove oil 45% in liposome base twice daily for 2 weeks improves hyperhidrosis severity and decreases the rate of sweating by around 34% when compared with a saline control (100596). The validity of these findings is limited by a lack of subject randomization.
• Impaired glucose tolerance (prediabetes). It is unclear if oral clove flower extract is beneficial in patients with prediabetes. Details: Preliminary clinical research in a very small number of patients with prediabetes shows that taking a polyphenolic extract from clove flower buds 250 mg daily for 30 days decreases pre-prandial plasma glucose by 14 mg/dL and postprandial plasma glucose by 40 mg/dL when compared to baseline (100595). The validity of these findings is limited by the very small size of the study and the lack of a control group.
• Mosquito repellent. Small clinical studies suggest that topical clove oil may repel mosquitos for up to 4-5 hours. Details: Preliminary clinical research shows that topical application of undiluted clove oil can repel 100% of mosquitoes for up to 4 hours (43427). Other preliminary research shows that topical application of gel containing clove oil 20% can repel 86% to 97% of mosquitoes for 5 hours (43411).
• Nausea and vomiting. Although there has been interest in using oral clove for nausea and vomiting, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Oral mucositis. Although there has been interest in using topical clove for oral mucositis, there is insufficient reliable information about the clinical effects of clove for this purpose.
• Pain (acute). It is unclear if topical clove is beneficial in patients with acute pain. Details: Preliminary clinical research shows that topical application of a gel containing ground cloves, applied as 4 grams of gel for 5 minutes prior to dental anesthesia injection, can reduce needle stick pain when compared with placebo. The effect of the clove gel on pain seems to be comparable to benzocaine 20% gel (43448).
• Premature ejaculation. Topical clove has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research shows that administration of a multi-ingredient cream preparation (SS Cream) containing clove flower, Panax ginseng root, Angelica root, Cistanches deserticola, Zanthoxyl species, Torlidis seed, Asiasari root, cinnamon bark, and toad venom to the glans penis, one hour prior to intercourse and washed off immediately before intercourse, increases ejaculatory latency time by over 4-fold when compared with placebo in adults with premature ejaculation (2537). It is unclear whether clove, another ingredient, or a combination of these ingredients is responsible for these effects.
• Pruritus. There is limited evidence on the topical use of clove oil in patients with chronic pruritus. Details: Preliminary clinical research in patients with chronic pruritus shows that applying clove oil 10% in petroleum jelly to the skin twice daily for 2 weeks reduces the daily duration of itching by 48 minutes and improves symptom severity and disability scores when compared with placebo (96950). More evidence is needed to rate clove for these uses.

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INSUFFICIENT RELIABLE EVIDENCE to RATE

• Lice. Preliminary clinical research shows that a single application of quassia tincture can kill head lice. However, the single application of quassia tincture resulted in 0.6% reinfestation rate after a week (17492). Researchers suggest that two applications with a one-week interval between them might be more effective.
• Rosacea. Preliminary clinical research in patients with rosacea shows that applying quassia 4% gel twice daily for 45 days reduces flushing, redness, and telangiectasia by approximately 74%, 56%, and 50%, respectively, compared with baseline. A moderate to complete overall improvement occurred in 89% of patients (99995). The validity of these results is limited by a lack of control group.
• Seborrheic dermatitis. Preliminary clinical research shows that applying quassia 4% gel twice daily for 28 days results in complete remission in 29.4% of patients with seborrheic dermatitis. This response rate is higher than the 5.6% and 7.1% response rate for patients using 1% ciclopirox olamine or 2% ketoconazole. At one-month post-treatment, quassia was more effective than the other two treatments for avoiding relapse (99994). However, the lack of placebo group makes conclusions difficult. More evidence is needed to rate quassia for these uses.

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POSSIBLY UNSAFE ...when used orally. The root, bark, and berries contain high amounts of tannins (6). Large doses may have mineralocorticoid activity (4). The root bark can also contain a carcinogen (5). There is insufficient reliable information available about the safety of bayberry for its other uses.

PREGNANCY AND LACTATION: POSSIBLY UNSAFE
when used orally or topically because of possible carcinogenic, or mineralocorticoid activities; avoid using (4,5).

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LIKELY SAFE ...when the fruit (nut) is consumed in amounts normally found in food.

POSSIBLY UNSAFE ...when the bark is used orally or topically, due to its juglone content (2). When applied topically, juglone-containing bark can cause skin irritation. When used orally on a daily basis, the juglone-containing bark of a related species (English walnut) is associated with increased risk of tongue cancer and lip leukoplakia (2,12). There is insufficient reliable information available about the safety of the leaf or hull when used orally as a medicine or when applied topically.

PREGNANCY AND LACTATION: LIKELY SAFE
when the fruit (nut) is consumed in amounts normally found in foods.

PREGNANCY AND LACTATION: POSSIBLY UNSAFE
when the bark is used orally or topically (12); avoid using. There is insufficient reliable information available about the safety of black walnut leaf or hull when used orally in medicinal amounts during pregnancy or lactation; avoid using.

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LIKELY SAFE ...when used orally in amounts commonly found in foods. Clove, clove oil, and eugenol have Generally Recognized As Safe (GRAS) status for use in foods in the US (4912).

POSSIBLY SAFE ...when clove oil is applied topically (272). A clove oil 1% cream has been applied to the anus with apparent safety for up to 6 weeks (43487). A liposome-based product containing clove oil 45% has been applied to the palms with apparent safety for up to 2 weeks (100596).

LIKELY UNSAFE ...when clove smoke is inhaled. Smoking clove cigarettes can cause respiratory injury (17,43599). ...when clove oil is injected intravenously. This can cause pulmonary edema, hypoxemia, and acute dyspnea (16384). There is insufficient reliable information available about the safety of using clove orally in medicinal amounts.

CHILDREN: LIKELY UNSAFE
when clove oil is taken orally. Ingesting 5-10 mL of undiluted clove oil has been linked to reports of coagulopathy, liver damage, and other serious side effects in infants and children up to 3 years of age (6,17,43385,43395,43419,43457,43652).

PREGNANCY AND LACTATION: LIKELY SAFE
when used orally in amounts found in foods (4912). Clove, clove oil, and eugenol have Generally Recognized As Safe (GRAS) status for use in foods in the US (4912). There is insufficient reliable information available about the safety of using clove in medicinal amounts during pregnancy and lactation; avoid using.

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LIKELY SAFE ...when used orally in amounts commonly found in foods. Quassia has Generally Recognized as Safe (GRAS) status in the US (4912).

POSSIBLY SAFE ...when used topically and appropriately. A 4% quassia gel has been safely used twice daily for up to 45 days (99995).

POSSIBLY UNSAFE ...when used orally in medicinal amounts. Quassia wood contains cardioactive glycosides (4), but toxicity is likely limited by emetic effects of large doses (4). There is insufficient reliable information available about the safety of rectal use of quassia.

PREGNANCY AND LACTATION: LIKELY UNSAFE
when used orally; avoid using. Quassia has cytotoxic and emetic properties (4,18,19). There is insufficient reliable information available about the safety of rectal or topical use during pregnancy or lactation; avoid using.

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ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Minor Be watchful with this combination. Severity = Moderate •  Occurrence = Unlikely •  Level of Evidence = D Theoretically, clove oil may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.  Details Laboratory research suggests that eugenol, a constituent of clove, has antiplatelet activity (12889,43558,43650,43654). This interaction has not been reported in humans.

ANTIDIABETES DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use of clove extracts with antidiabetes drugs might increase the risk of hypoglycemia.  Details Clinical and laboratory research suggest that polyphenol extracts from clove flower buds might lower blood glucose levels (100595). Dosing adjustments for insulin or oral hypoglycemic agents may be necessary when taken with clove. Monitor blood glucose levels closely.

IBUPROFEN (Advil, others) Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = D Theoretically, topical application of clove oil with ibuprofen might increase the absorption and side effects of topical ibuprofen.  Details Laboratory research shows that topical application of clove oil increases the absorption of topical ibuprofen (98854). This interaction has not been reported in humans.

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ANTIDIABETES DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D In animals, quassia extract reduced levels of fasting glucose (99998). Theoretically, quassia might have additive effects when used with antidiabetes drugs. This might increase the risk of hypoglycemia in some patients. Monitor blood glucose levels closely.  Details Some antidiabetes drugs include glimepiride (Amaryl), glyburide (DiaBeta, Glynase PresTab, Micronase), insulin, metformin (Glucophage), pioglitazone (Actos), rosiglitazone (Avandia), and others.

DIURETIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Overuse of quassia might compound diuretic-induced potassium loss (13). There is some concern that people taking quassia along with potassium depleting diuretics might have an increased risk for hypokalemia. Initiation of potassium supplementation or an increase in potassium supplement dose may be necessary for some patients.  Details Some diuretics that can deplete potassium include chlorothiazide (Diuril), chlorthalidone (Thalitone), furosemide (Lasix), and hydrochlorothiazide (HCTZ, Hydrodiuril, Microzide), and others.

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General ...Orally, bayberry can cause gastrointestinal irritation, vomiting, and liver damage, possibly due to its tannin content. It can also act as an irritant and sensitizer (6).

Dermatologic ...Orally, bayberry can act as an irritant and sensitizer (6).

Gastrointestinal ...Orally, bayberry can cause gastrointestinal irritation and vomiting, possibly due to its tannin content (6).

Hepatic ...Orally, bayberry can cause liver damage, possibly due to its tannin content (6).

Immunologic ...Airborne bayberry pollen is a common cause of allergic respiratory symptoms (33888,33916).

Pulmonary/Respiratory ...Airborne bayberry pollen is a common cause of allergic respiratory symptoms (33888,33916).

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General ...Orally, black walnut fruit (nut) is well tolerated. However, the leaf, bark, and hull of black walnut contain high quantities of tannins, which may cause adverse effects when used orally or topically.
Most Common Adverse Effects:
Orally: The leaf, bark, and hull can cause gastrointestinal upset.
Topically: Hull preparations may cause a temporary yellow or brown discoloration at the site of application. The leaf, bark, and hull can cause skin irritation.
Serious Adverse Effects (Rare):
Orally: The bark may increase the risk for tongue cancer or lip leukoplakia when used long-term.
All routes of administration: Allergic reactions, including anaphylaxis.

Dermatologic ...Topically, black walnut leaf, bark, or hull may have an irritating effect on the skin due to tannin content. Black walnut hull preparations might cause a temporary yellow or brown discoloration of the skin at the site of application (12).

Gastrointestinal ...Orally, black walnut leaf, bark, or hull may cause gastrointestinal upset due to tannin content (12). Also, daily use of the juglone-containing bark of a related species (English walnut) is associated with increased risk of tongue cancer and lip leukoplakia (2,12).

Hepatic ...Orally, black walnut leaf, bark, or hull may cause liver damage if taken for extended periods of time due to tannin content (12).

Immunologic ...Tree nuts, which include black walnuts, can cause allergic reactions in sensitive individuals. Due to the prevalence of this allergy in the general population, tree nuts are classified as a major food allergen in the United States (105410).

Renal ...Orally, black walnut leaf, bark, or hull may cause kidney damage if taken for extended periods of time due to tannin content (12).

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General ...Orally, clove is well tolerated when consumed as a spice; however, clove oil in doses of only 5-10 mL can be toxic in children. Topically, clove is generally well tolerated. When inhaled or used intravenously, clove may be unsafe.
Most Common Adverse Effects:
Topically: Burning, contact dermatitis, dental decay, itching, mucous membrane irritation, tingling, ulcers.
Inhaled: Dental decay, hypertension, itching, tachycardia.
Serious Adverse Effects (Rare):
Orally: Liver failure, respiratory distress.
Inhaled: Pneumonitis, pulmonary edema, respiratory distress.

Cardiovascular ...Smoking clove cigarettes increases heart rate and systolic blood pressure (12892).

Dental ...Population research has found that the risk of dental decay is increased in clove cigarette smokers (43332). Repeated topical application of clove in the mouth can cause gingival damage and skin and mucous membrane irritation (4,272,512). Eugenol, a constituent of clove and a material commonly found in dentistry, has been associated with side effects including gum inflammation and irritation (43365,43373,43522).

Dermatologic ...The American Dental Association has accepted clove for professional use, but not nonprescription use, due to potential damage to soft tissue that may be induced by clove application. In clinical research, small aphthous-like ulcers appeared in the area of the mouth where clove gel was applied in four participants (43448). Skin irritation and stinging have been reported with clove oil application (43338,43626). In a 24-year-old, exposure to a clove oil spill resulted in permanent local anesthesia and anhidrosis, or lack of sweating, at the affected area (43626).

Endocrine ...A case of hypoglycemia and metabolic acidosis have been reported after administration of one teaspoon of clove oil to a seven-month-old infant (43457). A case of electrolyte imbalance following accidental ingestion by a seven-month-old has also been reported (6).

Hematologic ...A case of disseminated intravascular coagulation has been reported in a 2-year-old patient after consuming between 5-10 mL of clove oil. The patient was treated with heparin, fresh frozen plasma, protein C, factor VII, and antithrombin III. On the fifth day, the patient started to improve and made a full recovery (43652).

Hepatic ...There are three cases of hepatic failure occurring in children after ingestion of 5-10 mL of clove oil (43395,43419,43652). Liver injury also occurred in a 3-year-old male (96949). These patients were successfully treated with N-acetylcysteine. The course of liver injury seems to be milder and shorter with early N-acetylcysteine treatment (43395,43419,96949). Another patient, who also presented with disseminated intravascular coagulation, was successfully treated with heparin, fresh frozen plasma, protein C, factor VII, and antithrombin III (43652).

Immunologic ...Contact dermatitis and urticaria has been reported following topical exposure to clove oil or eugenol, a constituent of clove oil (12635,43339,43606,43346).

Neurologic/CNS ...CNS depression has been reported in a 7-month-old who was given one teaspoon of clove oil accidentally in place of mineral oil for diarrhea. The patient was successfully treated with supportive care and gastric lavage (43457). A case of confusion and inability to speak has been reported secondary to oral exposure to clove oil and alcohol. The patient required intubation and was successfully treated with thiamine and normal saline (43580). Seizure and coma have been reported in a two-year-old male after ingesting 5-10 mL of clove oil (43652).

Pulmonary/Respiratory ...Clove cigarettes have been associated with throat and chest tightness (43337), pulmonary edema (43618), and fatal aspiration pneumonitis (43599). The causative factor may be clove alone or clove along with other substances found in cigarettes. Clove cigarettes contain significant amounts of nicotine, tar, and carbon monoxide and increase plasma levels of nicotine and exhaled carbon monoxide, which might cause long-term health effects similar to tobacco smoking (12892). According to the American Medical Association, inhaling clove cigarette smoke has been associated with severe lung injury in a few susceptible individuals with prodromal respiratory infection. Also, some individuals with normal respiratory tracts have apparently suffered aspiration pneumonitis as the result of a diminished gag reflex induced by a local anesthetic action of eugenol, which is volatilized into the smoke (43602).
Intravenous injection of clove oil in a 32-year-old female resulted in hypoxia, acute dyspnea, interstitial and alveolar infiltrates, and non-cardiogenic pulmonary edema. The patient was managed with supplemental oxygen and recovered over the next seven days (16384).
Occupational exposure to eugenol, a constituent of clove, has also been reported to cause asthma and rhinitis (43492).

Renal ...Proteinuria and other urinary abnormalities were observed in a seven-month-old infant given one teaspoon of clove oil accidentally in place of mineral oil for diarrhea. The patient was successfully treated with supportive care and gastric lavage (43457).

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General ...Orally, quassia can cause mucous membrane irritation, nausea, and vomiting when used in medicinal amounts (4,18). Long-term use can cause vision changes and blindness (18).
Topically, quassia seems to be well tolerated (99995). No adverse effects have been reported.

Gastrointestinal ...Orally, quassia has been reported to cause mucous membrane irritation, nausea, and vomiting when used in medicinal amounts (4,18).

Ocular/Otic ...Orally, long-term use of quassia can cause vision changes and blindness (18).

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