Allium tuberosum

Allium tuberosum (Garlic Chives / Chinese Chives)

1. Identity and Botanical Description

Allium tuberosum (common names: garlic chives, Oriental garlic, Asian chives, Chinese chives, Chinese leek) is a species of plant native to the Chinese province of Shanxi, and cultivated and naturalized elsewhere in Asia and around the world. The binomial authority is Allium tuberosum Rottler ex Sprengel, placing it within the genus Allium. Taxonomically, it belongs to the family Amaryllidaceae, subfamily Allioideae.

Allium tuberosum is a rhizomatous, clump-forming perennial plant growing from a small, elongated bulb (about 10 mm across) that is tough and fibrous. Unlike either onion or garlic, it has strap-shaped leaves with triangular bases, about 1.5 to 8 mm wide. It produces many white flowers in a round cluster (umbel) on stalks 25 to 60 cm tall.

Common preparation forms include: fresh leaves, dried or powdered leaves, seed extracts (particularly butanol or methanolic fractions), essential oil distillate from leaves, and water-soluble or ethanol-soluble extracts used in experimental research. Processed products in the form of dried bulbs, leaves, buds and flowers from wild Allium species like A. tuberosum are used in food and medicinal applications. A. tuberosum is consumed as raw or cooked vegetables, spices, and seasonings.

2. Traditional and Historical Use

2.1 China

Allium tuberosum Rottl. ex Spreng is widely cultivated and used as food in China, and its seeds have been reputedly used in traditional Chinese medicine for treating both impotence and nocturnal emissions. In China, its documented use appears in texts like the Ben Cao Gang Mu (Compendium of Materia Medica), where it was noted for tonifying the kidney, improving male sexual health, and aiding digestion. Traditionally, Allium tuberosum has been used for treating nocturnal emissions, abdominal pain, diarrhea, sexual dysfunction, and asthma.

2.2 South and Southeast Asia

In the northeastern Indian state of Arunachal Pradesh, A. tuberosum was recorded among Allium species used by natives for vegetable, spices, condiment, and medicinal purposes, being consumed raw or in processed form as flavour/condiment in preparing food items and as herbal medicine. Field surveys have highlighted the edible uses of A. tuberosum in the Himalayas, particularly in the Garhwal and Kumaon regions. In Nepal, cooks fry a curried vegetable dish of potatoes and A. tuberosum known as dunduko sag.

2.3 Korea, Philippines, and Thailand

In several countries including China, the Philippines, Korea, and Thailand, garlic chives are a well-known vegetable. Asia is one of the origin centers of the Allium genus, and Chinese chive (Allium tuberosum) is among its most prominent food plants.

2.4 Purported Medicinal Uses Across Traditions

Allium tuberosum is a well-known spice as well as a herb in traditional Chinese medicine, used for increasing libido and treating erectile dysfunction. Medicinally, A. tuberosum seed extract is valued for its aphrodisiac properties. Traditional uses across documented sources include treatment of abdominal pain, diarrhea, nocturnal emissions, sexual dysfunction, and asthma, with the seeds considered particularly medicinally active.

3. Key Constituents and Active Compounds

3.1 Organosulfur Compounds

Chinese chive (Allium tuberosum) is an important source of dietary phytochemicals with proven antioxidant properties, such as organosulfur compounds, flavonoids, and saponins. The major constituents of the essential oil from A. tuberosum leaves are sulfur-containing compounds, including allyl methyl trisulfide (36.24%), diallyl disulfide (27.26%), diallyl trisulfide (18.68%), and dimethyl trisulfide (9.23%). While allicin, the characteristic pungent compound of garlic (A. sativum), was present at relatively low levels (16.60 mg kg⁻¹), the dominant organosulfur compound in A. tuberosum was allyl methyl thiosulfinate (AMThs) at a considerably higher concentration (269.00 mg kg⁻¹).

The flavor and aroma of A. tuberosum arise from the chemical transformation of S-alk(en)yl cysteine sulfoxides into volatile compounds, including S-methyl cysteine sulfoxide, S-allyl cysteine sulfoxide, and S-trans-prop-1-enyl cysteine sulfoxide, among others. Most of the functional effects and characteristic aroma in Allium are associated with the organosulfur compounds (OSCs), which are secondary phytochemical metabolites (e.g., thiosulfinates), biosynthesized for defensive purposes against abiotic stressors, formed once the plant tissue is damaged.

3.2 Flavonoids and Phenolic Compounds

Nutritional analysis of A. tuberosum revealed high concentrations of potassium (5355 mg/kg), phosphorus (691 mg/kg), and sulphur (2484 mg/kg), while biochemical profiling identified bioactive compounds such as flavonoids (3.19 mg/g) and organosulfur compounds, including allyl methyl thiosulfinate (269.00 mg/kg). The presence of a significant amount of total phenolics (1.187 mg GAE/g fresh weight basis) suggests strong antioxidant property, further supported by a high free radical scavenging activity (64.45% RSA DPPH).

From the leaves of A. tuberosum, compounds including N-p-coumaroyl tyramine and bis(p-hydroxyphenyl) ether have been isolated from the ethylacetate and butanol-soluble fractions. A new compound, kaempferol-3-O-(6″-feruloyl)-sophoroside, along with one known flavonoid glycoside and six amino acid compounds, has been isolated from the water-soluble fraction of the shoot of Chinese chive.

3.3 Steroidal Saponins (Tuberosides)

Thirteen new steroidal saponins, tuberosides A–M, from the seeds of this plant have been reported, along with additional novel saponins in subsequent research. Tuberoside M is a new cytotoxic spirostanol saponin isolated from the seeds of Allium tuberosum. A steroidal saponin named tuberoside, together with seven known compounds, was isolated from the seeds of Allium tuberosum Rottl. ex Spreng., with its structure established by spectroscopic data and hydrolysis as (2α, 3β, 5α, 25S)-2,3,27-trihydroxyspirostane 3-O-α-l-rhamnopyranoyl-(1→2)-O-[α-l-rhamnopyranoyl-(1→4)]-β-d-glucopyranoside.

A systematic phytochemical study on the components in the seeds of A. tuberosum led to the isolation of 27 steroidal glycosides (SGs 1–27), whose structures were identified mainly by nuclear magnetic resonance and mass spectrometries. Among these, 1–10 and 22–26 are new steroidal saponin analogues. An in vitro bioassay indicates that compounds 1, 2, 7, 8, 10, 13–15, 20, 23, and 26 display promotional roles in testosterone production of rat Leydig cells with EC₅₀ values of 1.0 to 4.5 μM.

3.4 Other Constituents

Alliums are rich in secondary metabolites including organosulfur compounds, flavonoids, phenols, saponins, alkaloids, and polysaccharides. Past research on A. tuberosum has revealed a rich profile of essential micronutrients and vitamins vital for various bodily functions, including immune response, bone health, and red blood cell formation. Earlier phytochemical studies also reported the isolation of adenosine and free amino acids from A. tuberosum leaves, as well as a β-carboline alkaloid.

4. Established Mechanisms of Action

4.1 Antioxidant Mechanisms

Allium phytochemicals combat oxidative stress through multiple mechanisms, including the direct neutralization of free radicals and enhancement of the body's antioxidant defenses. In preclinical research, A. tuberosum extracts have been shown to upregulate antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), and glutathione (GSH), while reducing lipid peroxidation products measured as malondialdehyde (MDA).

4.2 Anti-inflammatory Mechanisms

The mechanism of anti-inflammatory activity of some organosulfur compounds can be associated with the inhibition of TNF-α-initiated secretion of pro-inflammatory cytokines from epithelial digestive cells. Compounds such as DADS, DATS, and SAC inhibit the formation of inflammatory lipopolysaccharide by repressing NF-κB and MAPK signaling pathways. At the preclinical level, A. tuberosum extract significantly inhibited MDA, IL-1β, IL-6, and TNF-α levels and prevented the depletion of antioxidant enzymes GSH, SOD, and CAT activities in CCl₄-induced liver damage models.

4.3 Proapoptotic / Anticancer Mechanisms

Thiosulfinates from A. tuberosum significantly decrease viable cancer cell numbers in dose- and time-dependent manners by apoptotic cell death via DNA fragmentation, chromatin condensation, and an increased sub-G1 phase. Apoptosis induced by thiosulfinates is associated with the activation of initiator caspases-8 and -9, and the effector caspase-3. Thiosulfinates stimulate Bid cleavage, indicating that the apoptotic action of caspase-8-mediated Bid cleavage leads to activation of caspase-9. Thiosulfinates decrease the expression of the anti-apoptotic protein Bcl-2 and increase the expression of the pro-apoptotic protein Bax, as well as increase the expression of AIF, a caspase-independent mitochondrial apoptosis factor.

4.4 Skeletal Muscle Signaling Pathways

Among compounds isolated from A. tuberosum shoots, the newly isolated flavonoid kaempferol-3-O-(6″-feruloyl)-sophoroside and 5-aminouridine up-regulated PI3K/Akt/mTOR pathways, implying a positive effect on skeletal muscle growth and differentiation. In particular, the kaempferol glycoside down-regulated the Smad pathways, which are negative regulators of skeletal muscle growth.

4.5 Testosterone and Reproductive Signaling

An in vitro bioassay indicates that multiple steroidal glycosides from A. tuberosum seeds display promotional roles in testosterone production of rat Leydig cells with EC₅₀ values of 1.0 to 4.5 μM.

5. Scientific Evidence by Area of Use

5.1 Antidiabetic and Metabolic Activity

Evidence type: Preclinical (animal models) — no human clinical trials identified.

The antidiabetic and hepatoprotective activities of the butyl alcohol fraction from the methanolic extract of A. tuberosum have been investigated in a rat model. For the antidiabetic activity, rats were induced with diabetes by intraperitoneal injection of 150 mg/kg alloxan and treated for 30 days with AT extract at doses of 100, 200, and 400 mg/kg. Fasting blood glucose (FBG), triglyceride (TG), total cholesterol (TC), HDL, MDA, catalase, superoxide dismutase, and glutathione levels were assessed. AT significantly decreased FBG, serum TG, TC, and MDA levels, and significantly increased HDL, SOD, GSH, and CAT activities in the diabetic rats. The authors concluded that the antidiabetic and hepatoprotective effect of AT may be associated with its antioxidant activity and its ability to inhibit pro-inflammatory mediators.

A follow-up study investigated diabetic nephropathy. The objective was to evaluate the effect of the butanol fraction from Allium tuberosum (BFAT) in a high fat diet/streptozotocin (HFD/STZ) induced diabetic nephropathy model. Wistar rats were fed with HFD for 4 weeks and thereafter administered with 35 mg/kg STZ intraperitoneally. Diabetic rats were treated with BFAT (100 or 400 mg/kg) and metformin (150 mg/kg) for 40 days. BFAT markedly decreased blood glucose, serum creatinine, blood urea nitrogen, and urinary albumin levels in diabetic rats, and upregulated renal antioxidant enzyme status (glutathione, superoxide dismutase, and catalase) while decreasing lipid peroxidation products and the levels of renal pro-inflammatory cytokines.

Evidence strength: All current antidiabetic evidence is derived from animal (rodent) studies using alloxan or streptozotocin models. No human clinical trials have been identified.

5.2 Hepatoprotective Activity

Evidence type: Preclinical (animal) — no human clinical trials identified.

In the same 2017 study by Tang et al. (Food Research International), hepatoprotective effects were assessed using a CCl₄-induced acute liver injury model. After CCl₄ administration (10 ml/kg of 2% v/v CCl₄) intraperitoneally to induce acute liver injury, blood and liver samples were obtained and serum enzymes ALT, AST, ALP, SOD, GSH, CAT, MDA, and pro-inflammatory mediators were assessed. AT significantly inhibited MDA, IL-1β, IL-6, and TNF-α levels and prevented the depletion of antioxidant enzymes GSH, SOD, and CAT activities in CCl₄-induced liver damage. Furthermore, AT markedly reduced AST, ALT, and ALP levels in the CCl₄-treated groups.

Evidence strength: Preliminary; restricted to in vivo rodent chemical injury models. No human data.

5.3 Anticancer Activity

Evidence type: In vitro (cell line) and limited in vivo (mouse) studies — no human clinical trials.

The thiosulfinate isolates S-methyl 2-propen-1-thiosulfinate and S-methyl methanethiosulfinate show in vitro cytotoxicity against human tumor cells and in vivo anticancer activity in mice inoculated with Sarcoma-180 cancer cells, leading to an increase in lifespan. These isolates inhibit cancer cell lines through apoptosis and activate the colon cancer (HT-29 cells) apoptosis pathway through caspase-dependent/independent mechanisms.

Studies have evaluated the apoptotic effects of thiosulfinates purified from A. tuberosum on PC-3 human prostate cancer cells. Thiosulfinates significantly decrease viable cell numbers in dose- and time-dependent manners via DNA fragmentation, chromatin condensation, and increased sub-G1 phase. Thiosulfinates from A. tuberosum were evaluated on proliferation of metastatic (DU145) and primary malignant tumor (RC-58T/h/SA#4)-derived human prostate cancer cells, decreasing viable cell numbers in a dose- and time-dependent manner through apoptosis associated with activation of initiator caspases-8 and -9 and the effector caspase-3.

Tuberoside M from the seeds of A. tuberosum inhibited the growth of the human promyelocytic leukemia cell line (HL-60) with an IC₅₀ of 6.8 μg/mL.

Evidence strength: All evidence is in vitro (cell culture) or limited mouse in vivo. There are no human clinical trials on A. tuberosum as an anticancer agent. These findings are preliminary and cannot support therapeutic claims.

5.4 Sexual Function and Aphrodisiac Properties

Evidence type: Animal studies (rats) and in vitro cell assays — no human clinical trials.

In a rodent study, the n-BuOH extract (500 mg/kg body weight/day) and L-dopa (100 mg/kg body weight/day) were administered orally by gavage for 40 days. Mount latency, intromission latency, ejaculation latency, mounting frequency, intromission frequency, ejaculation frequency, and post-ejaculatory interval were observed before and during the study at day 0, 10, 20, 30, and 40. The n-BuOH extract significantly reduced ML, IL, EL, and PEI (p < 0.05) and significantly increased MF, IF, and EF (p < 0.05).

In a separate study published in BMC Complementary Medicine and Therapies, male Wistar rats were administered graded doses of the n-BuOH extracts of A. tuberosum (50, 100, 200, and 400 mg/kg) with Viagra as the positive control, administered by gastric probe once daily for 45 days. ATB relaxed corpus cavernosum smooth muscle (68.9%) at a concentration of 200 μg/ml. The results indicated that ATB significantly increased mount frequency (MF), intromission frequency (IF), ejaculation frequency (EF), and ejaculation latency (EL), and markedly reduced post ejaculatory interval (PEI), mount latency (ML), and intromission latency (IL). A remarkable increase in the test for potency was also observed, with marked increases in erections, quick flips, long flips, and total reflex. ATB also significantly improved sperm viability and count and increased concentrations of testosterone, follicle stimulating hormone (FSH), and phosphatases in treated animals.

Evidence strength: All sexual function evidence is from animal (rat) models. No human clinical data exist. While results are consistent across studies, translation to human efficacy cannot be assumed.

5.5 Antioxidant Activity

Evidence type: In vitro assays and preclinical animal models.

The presence of significant total phenolics (1.187 mg GAE/g fresh weight basis) in A. tuberosum suggests strong antioxidant property, further supported by high free radical scavenging activity (64.45% RSA DPPH) in vitro. A. tuberosum contains a large amount of phenol, including caffeic acid, a compound that protects against adipocytes and has anti-adipogenic properties. A. thunbergii, A. tuberosum, and A. sacculiferum exhibit the highest levels of antioxidative and antiadipogenic effects, with potential benefits against obesity.

Evidence strength: Primarily in vitro. Rodent data support antioxidant enzyme upregulation, but no human clinical trials exist specifically for A. tuberosum.

5.6 Antimicrobial Activity

Evidence type: In vitro microbiological assays.

By virtue of their secondary metabolites, Allium species including A. tuberosum offer a range of nutritional, biological, and health benefits, such as antimicrobial, antioxidant, antitumor, immunomodulatory, antidiabetic, and anti-inflammatory properties. A chitinase-like antifungal protein has been isolated from the inner shoots of A. tuberosum (reported by Lam et al., 2000), demonstrating antifungal properties. Laboratory studies illustrate zones of inhibition and antimicrobial activity of Allium tuberosum across different concentrations and microorganisms.

Evidence strength: In vitro only. No clinical trials for antimicrobial indications.

5.7 Skeletal Muscle Cell Proliferation

Evidence type: In vitro (C2C12 cell model).

Researchers isolated kaempferol-3-O-(6″-feruloyl)-sophoroside along with one known flavonoid glycoside and six amino acid compounds from the water-soluble fraction of Chinese chive shoots. The isolated compounds were evaluated for their proliferation activity on skeletal muscle cells. The newly isolated flavonoid and 5-aminouridine up-regulated PI3K/Akt/mTOR pathways, implying a positive effect on skeletal muscle growth and differentiation. In particular, the kaempferol glycoside down-regulated the Smad pathways, which are negative regulators of skeletal muscle growth. The researchers suggest that major constituents of Chinese chive, flavonoids and amino acids, might be used in dietary supplements that aid skeletal muscle growth.

Evidence strength: In vitro only (C2C12 murine myoblast cell line). No animal or human studies on this application.

6. Body Systems and Health Areas Associated with Allium tuberosum

• Endocrine / Metabolic System: Antidiabetic effects documented in rodent models (blood glucose reduction, lipid normalization); antiadipogenic properties identified in vitro.
• Hepatic System: Hepatoprotective effects demonstrated in CCl₄-induced liver injury in rodents; normalization of liver enzymes (ALT, AST, ALP).
• Reproductive / Urogenital System: Traditionally used for treating nocturnal emissions and sexual dysfunction. Steroidal saponins promote testosterone production in vitro; rodent studies support corpus cavernosum smooth muscle relaxation and improved sexual behavior parameters.
• Cardiovascular System: The Allium genus, including Chinese chive, is associated with prevention of cardiovascular and heart diseases through its organosulfur compounds, quercetin, flavonoids, and saponins.
• Oncological (preclinical): Thiosulfinates and steroidal saponins demonstrate in vitro cytotoxicity and proapoptotic activity in human cancer cell lines (PC-3, HT-29, HL-60).
• Musculoskeletal System: Kaempferol glycosides and amino acids in vitro upregulate PI3K/Akt/mTOR pathways relevant to skeletal muscle growth.
• Immune / Antimicrobial: Organosulfur compounds and a chitinase-like protein show in vitro antimicrobial and antifungal activity.
• Gastrointestinal System: Traditionally used for abdominal pain, diarrhea, and digestive complaints.
• Renal System: Butanol extract demonstrated renoprotective effects in a diabetic nephropathy rodent model.

7. Dosage Forms and Doses Reported in Studies

No standardized human dosage has been established for Allium tuberosum as a supplement. The following doses were specifically reported in preclinical studies:

• Antidiabetic model (alloxan-induced diabetic rats): AT butyl alcohol fraction from methanolic extract administered at 100, 200, and 400 mg/kg for 30 days.
• Diabetic nephropathy model (HFD/STZ rats): BFAT administered at 100 or 400 mg/kg; metformin (150 mg/kg) used as comparator, administered for 40 days.
• Aphrodisiac study (rats, 2009): n-BuOH extract at 500 mg/kg body weight per day, administered orally by gavage for 40 days.
• Aphrodisiac/corpus cavernosum study (Wistar rats): n-BuOH extracts at graded doses of 50, 100, 200, and 400 mg/kg, administered by gastric probe once daily for 45 days.
• Corpus cavernosum smooth muscle relaxation (in vitro): ATB relaxed corpus cavernosum smooth muscle (68.9%) at a concentration of 200 μg/mL.
• Testosterone production in Leydig cells (in vitro): Steroidal glycosides active at EC₅₀ values of 1.0 to 4.5 μM.
• HL-60 leukemia cell cytotoxicity (in vitro): Tuberoside M IC₅₀ = 6.8 μg/mL.

8. Safety Considerations and Interactions

8.1 General Safety Profile

To validate traditional claims and ensure safe and effective therapeutic use, more rigorous pharmacological, clinical, and toxicological investigations are needed. Formal human safety data for concentrated A. tuberosum supplements are lacking in the published literature reviewed. At culinary consumption levels, the plant is widely consumed across Asia without documented population-level adverse effects.

8.2 Allium-Class Allergic Reactions

Allium allergy is a hypersensitivity to plants within the Allium genus. These allergies are often IgE-mediated, driven by the immune system's production of immunoglobulin E antibodies in response to allergenic proteins found in these plants. Common symptoms include skin reactions (hives or allergic contact dermatitis, particularly after handling), respiratory symptoms (wheezing, coughing, and even occupational asthma, especially where dust is inhaled), gastrointestinal distress (nausea, vomiting, diarrhea, and stomach pain), and, in rare cases, anaphylaxis. Given the shared organosulfur chemistry between A. tuberosum and other Allium species, cross-reactivity is plausible in Allium-sensitive individuals.

8.3 Contact Dermatitis

Garlic (Allium sativum) is known to cause skin lesions exhibiting classic features of irritant contact dermatitis (ICD), including spongiosis, necrotic keratinocytes, and superficial dermal inflammation. These cases often yield negative patch test results for diallyl disulfide — the primary allergen in garlic — further excluding allergic contact dermatitis as a diagnosis. Because A. tuberosum shares key organosulfur constituents (including diallyl disulfide) with garlic, analogous skin irritation upon prolonged topical contact is a relevant safety consideration.

8.4 Organosulfur Compound Safety

Organosulfur compounds are secondary metabolites produced by different Allium species with important biological activities. In recent years, their use has been promoted in the agri-food industry as a substitute for synthetic preservatives, increasing potential accumulative exposure to consumers. Before their application in the food industry, it is necessary to pass a safety assessment as specified by the European Food Safety Authority (EFSA).

8.5 Evidence Gaps Relevant to Safety

No species-specific human toxicology data for A. tuberosum extracts at supplemental doses appear in the published literature. Based on its chemical similarity to garlic, considerations relevant to the broader Allium class — including potential antiplatelet/anticoagulant effects of organosulfur compounds, and interactions with anticoagulant medications — may be applicable, but have not been specifically studied in the context of A. tuberosum.

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