Job's tears

Job's Tears (Coix lacryma-jobi L.)

1. Identity, Taxonomy, and Nomenclature

Job's Tears (Coix lacryma-jobi L.) is a perennial grass from the Poaceae (grass) family, recognized as both a nutritious cereal grain and a medicinal crop with deep roots in traditional Asian medicine. The botanical name derives its common English name from the distinctive tear-drop shape of its seeds, which are technically hardened, bead-like false fruits or utricles. The species, native to Southeast Asia, was named by Carl Linnaeus in 1753, with the specific epithet serving as a Latin translation of the metaphorical "tear of Job."

It is a distant relative of maize in the Maydae tribe of the grass family and is commonly known under the names Job's tears, adlay, mayuen, Chinese pearl barley, and hatomugi. The seeds are known in Hindi as Vaijanti (वैजंती) or Baijanti (बैजंती), in Chinese as yìyǐ rén (薏苡仁, where rén means "kernel"), and are also described in Latin as Semen Coicis or Semen Coicis lachryma-jobi in pharmacopoeic literature. The seed is known as yi yi ren in Traditional Chinese Medicine (TCM) and derives specifically from the cultivated variety known as Coix lacryma-jobi var. ma-yuen.

There are four recognized botanical varieties of the species: C. lacryma-jobi var. ma-yuen (Rom. Caill.) Stapf, C. lacryma-jobi var. Puellarum (Balansa), C. lacryma-jobi var. lacryma-jobi, and C. lacryma-jobi var. Stenocarpa Oliv. Of these, var. ma-yuen is the cultivated variety with soft shells, and the majority of pharmacological and nutritional research has focused on this variety.

Morphology and Origin

Coix lacryma-jobi is an upright, robust, perennial (often cultivated as an annual) grass that typically grows to a height of 1 to 3 meters. The plant is characterized by stout, erect or ascending culms, which may exhibit branching; the leaf sheaths are smooth, while the leaf blades are long, broad, and narrowly lanceolate, measuring 20–50 cm in length and 1.5–4 cm in width, with a prominent pale midrib and a short membranous ligule at the base. The genus Coix is believed to have originated in the hilly tracts of Northeastern India and Myanmar, a region characterized by remarkable genetic diversity of wild Coix lacryma-jobi and Coix aquatica. Job's tears seeds are mainly produced in East and South-East Asia, including China, Japan, the Philippines, Burma, and Thailand.

Common Forms and Preparations

The plant has been widely consumed in forms such as porridge, beverages, and as a rice substitute, while also being used therapeutically for wounds, urinary tract infections, and inflammatory disorders. Coix seeds contain phenols, flavonoids, polysaccharides, proteins, fibers, vitamins, and oils; coix grain is generally polished as hulled grain or milled as flour and used in food components. In medicinal contexts, preparations include dried whole seeds, water decoctions, aqueous or ethanolic extracts, seed oils, and standardized pharmaceutical-grade extracts. Coix is also sold as Kanglaite in China and is used as an anticancer drug. In Japan, coix seed is approved as the ethical drug Yokuinin, and the Japanese Pharmacopeia lists Yokuinin, powdered Yokuinin, and its extract as approved ethical drugs.

2. Historical and Traditional Use

Archaeological Record

Coix lacryma-jobi has been cultivated for food and medicine for thousands of years; native to Southeast Asia, it was eventually brought to Europe, Africa, and the Americas. Archaeological finds of pottery residues from a Yangshao culture site in China show that Job's tears were used to brew beer as early as 3000 BC. Remains of Job's tears have also been found at archaeological sites in northeastern India, dating to approximately 1000 BC. In East Asia, the plant has been cultivated for more than 2,000 years as both grain and medicine, symbolizing purity and healing.

Traditional Chinese Medicine (TCM)

In traditional Chinese medicine, Coix has been used for thousands of years as a stomachic, diuretic, analgesic, antispasmodic, and anti-inflammatory agent. Traditionally, Chinese used coix cereal as medicinal food, tea, and herbal decoction to treat diabetes, inflammation, and neuralgia. In classical TCM texts, coix seed has a sweet, light taste and a cool nature; it enters the spleen, stomach, and lung meridians, and carries the actions of promoting diuresis and dampness drainage, strengthening the spleen to prevent diarrhea, removing arthralgia, expelling pus, and detoxifying and dispersing nodules. It is indicated for the treatment of edema, athlete's foot, poor urination, spleen deficiency with diarrhea, dampness obstruction, lung carbuncle, intestinal carbuncle, verruca, and cancer.

Known in Chinese medicine as Yì Yǐ Rén (薏苡仁), it belongs to the category of herbs that "drain Dampness" in the Chinese Materia Medica and is one of the important herbs in traditional Chinese medicine. China is one of the earliest countries to recognize the value of adlay, not only as a food source but also as a health-promoting ingredient and a medicinal herb.

Ayurveda and India

Coix lacryma-jobi is used in Ayurveda as well as in Traditional Chinese Medicine to treat a variety of ailments. Before maize became popular in South Asia, coix was rather widely cultivated as a cereal in India and still occurs as a minor cereal; it was used as food, particularly by peasants in the Far East, very early in agricultural history.

Southeast and East Asia

In southern China, Job's tears are often made into a sweet dessert soup, with one variety called ching bo leung (清補涼) in Cantonese, also known as sâm bổ lượng in Vietnam. In Cambodia, where it is known as skuay, it is used both in herbal medicine and to prepare an ingredient in desserts. In Thailand, it is often consumed as tea and other beverages. A Korean liquor called okroju (옥로주) is made from rice and Job's tears. In Japan, coix seeds are called juzudama, a reference to their use as Buddhist prayer beads.

Ornamental and Ritual Use

The var. lacryma-jobi was introduced into the Middle East from Asia, where its hard white ripe seeds were threaded into rosary beads for Muslim devotional prayer. The miim festival of the Zomi peoples of Myanmar is named after Coix, where it is given as a tribute to parting souls. In Christian regions, the naturally perforated seeds became sacred symbols of prayer, featured in rosaries and devotional jewelry; in folk traditions across Asia and Africa, Job's tears necklaces were worn as charms for protection and good fortune.

3. Chemical Composition and Key Bioactive Constituents

Macronutrient Profile

The seed of Coix lacryma-jobi L. contains 50–79% starch, 16–19% proteins, and 2–7% fixed oil, along with lipids including 5.67% glycolipid, 1.83% phospholipid, and sterols, as well as fatty acids including palmitic, stearic, oleic, and linoleic acids. The protein content is remarkably high, especially in the seed kernels, which contain about 20% protein, with some reports of wild-type coix seed containing up to 31.72% protein; the coix shell also contains 2.17–2.80% protein. The seed is composed of around 58% starch, which is free of gluten, and it contains 8 essential amino acids and vitamin E, making it an important food crop in mountain regions where rice does not grow and for use in a gluten-free diet.

Of the six detected fatty acids, the major fatty acids in seed oil are oleic acid (46.3%) and linoleic acid (37.4%). The average total vitamin E content across varieties is 37.38 mg/kg, with the two major components being γ-tocopherol (14.76 mg/kg) and γ-tocotrienol (14.18 mg/kg); tested varieties also exhibit squalene content ranging from 31.23 to 55.00 mg/kg, and the phytosterols campesterol, stigmasterol, and β-sitosterol are present at concentrations of 80.43, 131.1, and 313.38 mg/kg, respectively.

Signature Bioactive Compounds

A comprehensive review identifies the key bioactive constituents of coix seeds as including phenolic acids, flavonoids, phytosterols, polysaccharides, coixol, and coixenolide.

• Coixenolide: Active medicinal components of coix grain include coixol, coixin, and coixenolide, which have been the subject of considerable recent research. The content of coixenolide in coix seeds ranges from 176.77 ± 5.91 to 238.60 ± 0.21 μg/g; coixenolide, which exhibits antineoplastic activity, makes up no more than 0.25% of coix seeds.
• Coixol (6-methoxybenzoxazolone): Coixol, a pharmacologically active compound isolated from Coix lacryma-jobi L., has demonstrated central muscle relaxant properties. Coixol is repeatedly mentioned in pharmacology papers and may participate in anti-inflammatory, analgesic, and immune-related activity.
• Polysaccharides: The plant contains a range of bioactive components including polysaccharides, lipids, polyphenols, phytosterols, carotenoids, spiroenone, and lactams; these bioactive constituents contribute to health benefits including anti-oxidation, anti-cancer, anti-inflammation, anti-allergy, enhancement of immunological activity, regulation of endocrine functions, anti-obesity, anti-diabetes, gastroprotection, hypolipidemia, and modulation of gut microbiota.
• Phenolic compounds: HPLC analysis of adlay seed extract identifies phenolic compounds including chlorogenic acid, p-coumaric acid, caffeic acid, and ferulic acid. The lignan 4-ketopinoresinol from coix has been reported to be a strong DPPH radical scavenger.
• Phytosterols: Total phytosterol content in coix seed oil ranges from 1.43 to 1.69 wt%, with free phytosterols from 0.54 to 0.61 wt%, and ferulate phytosterol esters from 0.109 to 0.119 wt%.

Mechanisms of Action

These compounds exert multifaceted bioactivities, including antioxidant, anti-inflammatory, lipid-modulatory, antidiabetic, and antineoplastic effects, mediated through critical molecular targets such as Nuclear Factor kappa-light-chain-enhancer of activated B cells (NF-κB), Phosphoinositide 3-Kinase/Protein Kinase B, AMP-Activated Protein Kinase (AMPK), and Nrf2.

Coix seed constituents have been shown in laboratory studies to inhibit enzymes including cyclooxygenase (COX), fatty acid synthase, matrix metalloproteinases (MMPs), and enzymes of liver cholesterol synthesis.

In in vitro investigations of fat metabolism, coixol has been shown to increase the mRNA expression of Adrb3 and Prkaa1 (mediators of the β3-adrenergic receptor and AMPK pathways); co-treatment with relevant agonists further amplified β3-AR, AMPK, and UCP1 expression, while co-treatment with antagonists abolished these effects, confirming that β3-AR and AMPK activation are indispensable mediators of the thermogenic response induced by coixol.

In a βTC-6 cell model, coixol at 200 μM stimulated insulin secretion at high glucose concentration (20 mM) after incubation for 60 minutes at 37 °C. This mechanism is consistent with a potential role in glucose homeostasis.

4. Scientific Evidence by Health Area

4.1 Oncology: Kanglaite (Coix Seed Oil) as Adjunctive Cancer Therapy

Kanglaite (KLT), a Chinese medicine preparation, is widely used in China to treat lung and liver cancer, and complications of cancers such as malignant pleural effusion. This preparation is available as injections and capsules and is mainly composed of the oil extracted from coix seeds (Coix lacryma-jobi L. [Family: Poaceae]).

Clinical evidence summary: Clinical evidence from randomized clinical trials and systematic reviews showed that when used as adjunctive therapy for cancers, KLT plus chemotherapy can improve survival time, disease response rates, quality of life, and immune functions, and also reduce adverse reactions caused by chemotherapy drugs.

A 2022 evidence-mapping overview searched PubMed and Embase from inception to November 2021, synthesizing published meta-analyses on KLT in cancer treatment; however, it found that the clinical evidence reported in individual primary studies had not been adequately pursued and the methodological quality of existing meta-analyses remained unknown. The principal methodological flaws identified involved lack of pre-designed protocols and registration, absence of comprehensive search strategies, failure to list excluded studies with reasons, inadequate information on included studies, and failure to evaluate the potential impact of risk of bias.

The conclusion of that overview is that current evidence reveals KLT is effective and safe as adjunctive treatment for non-small cell lung cancer, malignant pleural effusion, and digestive system malignancies such as hepatocellular carcinoma; however, the results should be further verified by well-designed and clearly reported clinical trials and meta-analyses.

Gastric cancer (clinical cohort): One study observed the efficacy and side effects of Kanglaite® injection combined with chemotherapy in treating advanced gastric cancer; 60 patients were divided into an experimental group receiving Kanglaite® injection combined with chemotherapy and a control group receiving chemotherapy alone. After more than two courses of treatment, the response rate and KPS (Karnofsky Performance Status) score of the experimental group were significantly improved compared to the control group (P < 0.05), and gastrointestinal reactions and bone marrow suppression were significantly lower than in the control group (P < 0.05).

Cancer pain (meta-analysis): A meta-analysis of randomized controlled trials concluded that the combination of Kanglaite Injection with chemotherapy appears effective and safe in treating cancer pain, based on moderate-certainty evidence, pending further high-quality trials.

Anti-cancer immunomodulation: Some studies suggest that coix seed promotes the spontaneous regression of viral infections of the skin; meanwhile, Kanglaite, a purified oil agent used for cancer therapy, has been reported to increase the ratio of CD4+ T cells in the peripheral blood of cancer patients undergoing treatment.

In vitro evidence: Potent in vitro anti-proliferative, apoptotic, and anti-oxidative activities of semi-purified Job's tears extracts from different preparation methods were observed on five human cancer cell lines, compared with standards and a commercial product. This evidence is laboratory-based and does not directly demonstrate clinical efficacy.

Evidence strength: For Kanglaite as an adjunct to oncological chemotherapy, there is a body of RCTs and meta-analyses supporting efficacy in specific cancer types (non-small cell lung cancer, hepatocellular carcinoma, malignant pleural effusion, gastric cancer), but methodological quality of existing meta-analyses is rated as moderate to critically low by systematic reviewers. Anti-cancer activity of crude extracts remains predominantly in vitro and requires clinical validation.

4.2 Dermatology: Warts and Skin Viral Infections

In Japan, coix seed is approved as the ethical drug Yokuinin, and the Japanese Pharmacopeia lists Yokuinin, powdered Yokuinin, and its extract as approved ethical drugs. The typical adult dose is 3.0 to 6.0 g/day orally in three divided doses, adjusted according to the patient's age and symptoms. Coix seed and its extract are generally used in Japan to treat verrucae planae juveniles (plane warts) and verruca vulgaris (common warts), which are localized infections of the papillomavirus.

In clinical studies reviewed by Suzuki and Konaya (2021), Sugiura et al. conducted two trials confirming that coix seed improved pruritus in patients with dry skin, though changes were not observed in the moisture, sebum, or pH of the skin. Goto et al. reported that coix seed extract did not affect moisture, melanin, and elasticity of the skin, while it lowered sebum levels in healthy women.

Available data seem to indicate that coix seed may affect cellular immune function; however, there are limitations to the individual studies on which this consideration is based, and it is not conclusive which specific immune or clinical indices coix seed affects. The effects of coixol on human immune function have not been clarified. Coix seed appears promising for health promotion but presents an ongoing research challenge.

Evidence strength: Regulatory approval in Japan as an ethical drug for warts represents meaningful institutional recognition. Published controlled human studies on wart regression by coix seed alone as a single agent remain limited in number and methodological rigor.

4.3 Metabolic Health: Blood Glucose and Diabetes

Human RCT (type 2 diabetes): A study aimed to examine the influence of Job's tears in conjunction with probiotics on the lipid profile and glycated albumin (GA) concentration of patients with type 2 diabetes mellitus; this double-blind 12-week study involved 60 patients with type 2 diabetes randomly assigned into two groups, with the first group consuming yogurt alone (containing Lactobacillus acidophilus La5 and Bifidobacterium Bb12) and the second group consuming yogurt with Job's tears once daily (200 ml each). Lipids and GA concentrations were measured using an enzymatic colorimetric assay.

In vitro antidiabetic mechanisms: A systematic in vitro evaluation demonstrated that Coix lacryma-jobi fruit extract showed potent inhibition of key glucose-metabolising enzymes: α-glucosidase (IC50 = 4.31 ± 0.19 mg/ml), α-amylase (IC50 = 11.02 ± 0.11 mg/ml), and dipeptidyl peptidase-4 (DPP-4). Glucose uptake assays in L6 myoblasts showed enhanced absorption (122.89% at 62.5 μg/ml), akin to insulin's activity, likely via GLUT4 modulation.

A 2022 in vitro study evaluated the antiglycation effects of adlay on protein glycation using in vitro glycation assays; adlay seed was divided into four fractions (hull, testa, bran, and polished adlay), and solvent extraction was utilized to investigate active fractions. Chlorogenic acid and ferulic acid, identified via HPLC, were found to contribute to antiglycation actions.

Evidence strength: In vitro evidence for antidiabetic mechanisms (enzyme inhibition, GLUT4-mediated glucose uptake, antiglycation) is relatively robust. Human clinical trial data are sparse; while traditional use and preclinical research support its medicinal potential, rigorous human clinical trials are needed to confirm benefits and establish safe dosages.

4.4 Lipid Metabolism and Cardiovascular Health

Coix seed constituents inhibit enzymes involved in liver cholesterol synthesis, and the polyphenol extract of coix has been reported to exhibit notable hypocholesterolemic and antioxidant activities, potentially contributing to protective effects on cardiovascular health in vivo.

Animal studies (not human trials) have demonstrated hypolipidemic effects of crude adlay seed extract in rats fed a high-fat diet. A human study was referenced in the literature examining the impact of extruded dehulled adlay on blood lipids in subjects with mild to moderate dyslipidemia, but detailed clinical trial data from this study were not available in the sources reviewed. Studies on coix seed consumption as food and its clinical trial of health benefits in humans are still limited; further strong clinical studies are necessary to present the effects of coix seed dietary consumption in humans.

4.5 Anti-inflammatory and Rheumatoid Arthritis

Adlay seed (Job's tears, Coix lachryma-jobi L. var. ma-yuen Stapf) is a Traditional Chinese Medicine that has been investigated to treat inflammatory diseases and rheumatism. A study evaluated the ameliorative effects of adlay seed extract (ASE) in a complete Freund's adjuvant (CFA)-induced rheumatoid arthritis model in rats.

The RA Sprague–Dawley rat model was induced and randomly divided into six groups with or without ASE treatment (50, 100, or 200 mg/kg); after 28 days of administration, paw oedema values decreased from 1.46 ± 0.04 to 0.66 ± 0.07 cm³, PGE2 (prostaglandin E2) levels decreased from 126.2 ± 11.48 to 79.71 ± 6.8 pg/mL, and MMP-3 levels decreased from 142.7 ± 8.36 to 86.51 ± 5.95 ng/mL in the high-dose ASE group.

The therapeutic effect of ASE treatment on RA rats was comparable to that of celecoxib, especially in the high-dose ASE group (200 mg/kg/d).

Evidence strength: Evidence for anti-inflammatory and anti-arthritic effects is primarily from animal models. Human clinical trials in rheumatoid arthritis or general inflammatory conditions are not established in the peer-reviewed literature reviewed here.

4.6 Immune Modulation and Gut Microbiota

A comprehensive review of the existing literature has revealed that a few studies have demonstrated the promotion of spontaneous wart regression by coix seed preparations in human papillomavirus infection. Injections of purified oils from coix seed have been shown to enhance the effects of cancer therapy in China. In addition, coix-derived compounds including coixenolide and coixol have been reported to exert immunological activity.

The bioactive constituents of coix contribute to health benefits including enhancement of immunological activity and modulation of gut microbiota. A published human study examined coix seed consumption effects on gut microbiota and peripheral lymphocyte subset profiles in healthy male adults (2021), suggesting coix seed may influence cellular immune markers, though detailed outcome data from that study were not available to reproduce here.

Pruritus and skin immunity (in vitro): In vitro investigation using human-derived mast cell line HMC-1 found that coix sprouts extract inhibited histamine release when cells were treated with phorbol myristate acetate (PMA) and calcium ionophore A23187; treatment with coix sprouts extract at concentrations of 25 and 50 μg/mL showed significant inhibitory effects on histamine release. The inhibitory effect on IL-31 (a key substance in histamine-independent pruritus) was also examined; PMA and A23187 led to a significant increase in IL-31 cytokine production from 15.2 to 56.0 pg/mL compared to the untreated group, and treatment with coix sprouts extract at 25 and 50 μg/mL reduced IL-31 production.

4.7 Anti-obesity and Adipose Tissue

Coix seed constituents have been shown in research to possess anti-obesity activity. Preclinical and in vitro studies have investigated the role of coixol in fat browning and thermogenesis. Obesity, a metabolic disorder resulting from energy imbalance, often leads to excess fat and related diseases; browning of white adipose tissue, which increases energy expenditure, is a promising anti-obesity strategy, and this study examined the effects of Coix lacryma-jobi L. and its active compound coixol on this process. Coixol's ability to activate β3-AR and AMPK pathways in adipocytes suggests a plausible thermogenic mechanism, but these findings remain at the preclinical level.

5. Dosage Forms and Reported Dosages

Traditional Coicis Semen dosing in herbal medicine practice commonly falls in the 9 to 30 g daily range.

In Japan, coix seed is approved as the ethical drug Yokuinin, listed in the Japanese Pharmacopeia. The typical adult dose is 3.0 to 6.0 g/day orally in three divided doses, adjusted according to the patient's age and symptoms.

In the 2022 double-blind RCT in type 2 diabetes patients, the dosing regimen was a 12-week study involving 60 patients randomly assigned to consume yogurt alone or yogurt with Job's tears once daily (200 ml each).

In the rheumatoid arthritis animal study, ASE was administered at 50, 100, or 200 mg/kg body weight for 28 days. These dosages apply to a rat model and are not directly translatable to human doses.

For Kanglaite (coix seed oil emulsion) used as adjunctive cancer therapy, the preparation is available as injections and capsules, but specific dosages employed in clinical trials were not available in the sources reviewed. Dosing in these contexts is defined by the proprietary pharmaceutical product and supervised clinical protocols.

6. Body Systems and Health Areas Associated with Job's Tears

• Oncology / Neoplastic disease: Adjunctive use via Kanglaite for lung cancer, hepatocellular carcinoma, malignant pleural effusion, gastric cancer; in vitro antiproliferative effects on multiple cancer cell lines.
• Immune system: Immunomodulatory effects via polysaccharides and coixenolide; possible promotion of wart regression; increased CD4+ T-cell ratio in cancer patients treated with Kanglaite.
• Endocrine / Metabolic: Blood glucose modulation via α-glucosidase and DPP-4 inhibition, GLUT4 upregulation, coixol-stimulated insulin secretion in cell models; potential antiglycation activity.
• Cardiovascular / Lipid metabolism: Inhibition of hepatic cholesterol synthesis enzymes; phytosterol-mediated cholesterol reduction; hypocholesterolemic activity demonstrated in animal models.
• Musculoskeletal / Inflammatory: Anti-arthritic effects in animal models; inhibition of COX enzymes, PGE2, and MMPs; traditional use for arthralgia and neuralgia.
• Dermatology: Regulatory-approved use in Japan for plane and common warts; effects on sebum levels and pruritus investigated in human studies.
• Gastrointestinal / Renal: Traditional use as a diuretic, stomachic, and for dampness drainage; documented gut microbiota modulation in preclinical and preliminary human research.
• Adipose tissue / Body composition: Preclinical evidence for fat browning via β3-AR/AMPK pathways; anti-obesity activity in high-fat diet animal models.

7. Safety Considerations and Interactions

General Safety Profile

Job's tears is generally considered very safe as a food-herb. Coix seed has been evaluated across 109 studies and documented properties include antimicrobial, antiviral, antitoxin, wound healing, anti-aging, and diuretic activity, consistent with a long history of food use at dietary amounts. In vitro cytotoxicity studies showed minimal toxicity (IC50 > 6 mg/ml) in L6 and 3T3-L1 cells.

Pregnancy

Pregnancy may represent an unsafe context for taking Job's tears. Research in animals suggests it can poison a developing embryo. It can also cause the uterus to contract, and this might harm the pregnancy. Coix seed constituents have been shown in research to stimulate reproductive hormones and promote uterine contraction. Use with caution during pregnancy in large doses has been advised in Chinese herbal medicine practice, as it has mild uterine-stimulating effects. Ingestion of teas from the leaves or roots during pregnancy should be avoided according to herbal safety references.

Blood Sugar and Surgical Concern

Job's tears may lower blood sugar levels, raising a concern that it might interfere with blood sugar control during and after surgery.

Diuretic Interactions

Diuretic herbs, including Job's tears, have an additive effect with conventional diuretics and can deplete potassium with long-term use; this is relevant to individuals taking loop or thiazide diuretics, ACE inhibitors, angiotensin receptor blockers (ARBs), or lithium.

TCM Contraindications

In TCM practice, use is advised against in dry conditions without Dampness, and the herb is contraindicated in Yin and Blood deficiency, as its diuretic action promoting urination depletes fluids further.

Potential Allergic Reactions

People allergic to coix seed may experience allergic reactions such as itching and redness when consuming Job's Tears; individuals with a confirmed allergy to coix seed should avoid it.

Current Gaps and Limitations in Clinical Evidence

Studies on coix seed consumption as food and clinical trials of its health benefits in humans are still limited; further strong clinical studies are necessary to confirm the effects of coix seed dietary consumption in humans. Most preclinical findings come from in vitro cell studies and animal models, which do not automatically translate to human therapeutic outcomes. The evidence base for Kanglaite as an adjunct in oncology is the most developed in terms of human clinical data, but even here, the methodological quality of existing meta-analyses has been rated as imperfect by systematic reviewers.

References

• Bioactive landscape and therapeutic potential of Job's Tears (Coix lachryma-jobi L.) seeds: A comprehensive review — ScienceDirect (2025)
• Phytochemistry and health promoting effects of Job's tears (Coix lacryma-jobi) — A critical review — ScienceDirect
• Kanglaite (Coix Seed Extract) as Adjunctive Therapy in Cancer: Evidence Mapping Overview Based on Systematic Reviews With Meta-Analyses — PMC / Frontiers in Pharmacology (2022)
• Meta-analysis of the efficacy and safety of Kanglaite Injection in conjunction with chemotherapy for cancer pain — PMC / Frontiers in Oncology (2025)
• Coix Seed May Affect Human Immune Function — Suzuki & Konaya, Natural Product Communications (2021)
• Coix lachryma-jobi extract ameliorates inflammation and oxidative stress in a complete Freund's adjuvant-induced rheumatoid arthritis model — PMC
• Job's Tears: A Comprehensive Review of Its Traditional Uses, Nutritional Composition, and Pharmacological Potential — IJSRT Journal (2025)
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• Molecular Action Mechanism of Coixol from Soft-Shelled Adlay on Tyrosinase — PMC (2022)
• Coixol and Sinigrin from Coix lacryma-jobi L. and Raphanus sativus L. Promote Fat Browning in 3T3-L1 Adipocytes — PMC
• Anti-Pruritic and Immunomodulatory Effects of Coix Sprouts Extract — PMC / International Journal of Molecular Sciences (2024)
• Anti-tumor effect of coix seed based on the theory of medicinal and food homology — PMC
• Antiglycation Effects of Adlay Seed and Its Active Polyphenol Compounds: An In Vitro Study — PMC / Molecules (2022)
• The Effect of Adding Job's Tears to Yogurt on Plasma Glycated Albumin, Weight, and Lipid Profile in Patients with Type 2 Diabetes Mellitus: A Randomized Controlled Trial — Journal of Nutrition and Metabolism (2022)
• In vitro evaluation of antidiabetic potential of Coix lacryma-jobi — International Journal of Food Science and Technology (2025)
• Coix — An Overview — ScienceDirect Topics
• Assessment of the Genetic Diversity of Different Job's Tears (Coix lacryma-jobi L.) Accessions and the Active Composition and Anticancer Effect of Its Seed Oil — PubMed (2016)
• Job's tears — Wikipedia (botanical nomenclature and nomenclatural history)
• Adlay, an ancient functional plant with nutritional quality, improves human health — Frontiers in Nutrition (2022)
• Coix polysaccharides: Gut microbiota regulation and immunomodulatory — ScienceDirect
• Traditional Chinese Herb Garden: Plant Spotlight, Coix lacryma-jobi — University of Bristol Botanic Garden (2025)
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• Job's Tears: Health Benefits, Side Effects, Uses, Dose & Precautions — RxList (WebMD/Medscape reference database)