Description

Glycine max (L.) Merr., commonly known as soybean or soya bean, is a species of leguminous plant in the Fabaceae family (subfamily Papilionoideae), the same family as beans, peas, and cowpea . The genus name Glycine is derived from the Greek word glykys, meaning “sweet,” referring to the sweet taste of the young pods and seeds.

Origin and Distribution: Soybean is believed to have originated in East Asia, specifically China, where it was domesticated millennia ago from its wild ancestor Glycine soja. The earliest cultivation records date back approximately 5,000–7,000 years. Today, soybean is one of the most important agricultural crops globally, cultivated extensively in the Americas (Brazil, the United States, Argentina), Asia (China, India, Indonesia), and increasingly in Africa, including Nigeria. Brazil is currently the world’s largest exporter of soybeans.

Morphology: Soybean is an annual, erect herbaceous plant, typically growing 0.5–2 meters (20–80 inches) in height, depending on the cultivar and environmental conditions. The plant is generally pubescent (covered with fine hairs), which helps protect against pests and reduces water loss.

Root System: The root system is tap-rooted, with a well-developed main root and numerous lateral roots. A distinctive feature of soybean (and other legumes) is the formation of symbiotic root nodules containing nitrogen-fixing bacteria of the genus Bradyrhizobium japonicum. These nodules convert atmospheric nitrogen into a form usable by the plant, a process known as biological nitrogen fixation (BNF), which enriches soil fertility and reduces the need for synthetic nitrogen fertilizers.

Stem: The stem is cylindrical, pubescent (hairy), and can be either determinate (growth stops after flowering) or indeterminate (growth continues) depending on the cultivar. Branching may occur, particularly in determinate types.

Leaves: The leaves are trifoliate (composed of three leaflets) and arranged alternately on the stem. The leaflets are ovate to lanceolate in shape, measuring 4–20 cm in length and 3–10 cm in width. The leaf margins are entire (smooth), and the venation is reticulate (net-like). The underside of the leaf has a greater concentration of stomata and is pubescent, adaptations that minimize transpiration and protect against herbivores. The first pair of leaves (the primary leaves) are simple and opposite, while all subsequent leaves are trifoliate.

Flowers: The flowers are small, papilionaceous (butterfly-like, typical of the Fabaceae family), and borne in axillary or terminal racemes (clusters). They are usually white or purple (violet) . The floral structure is adapted for self-pollination (autogamous), with flowers typically opening and fertilizing before they fully open (cleistogamy). The stamens are diadelphous (9 fused and 1 separate), and the ovary is superior.

Fruit (Pod): The fruit is a simple, dry, dehiscent pod (legume) that is straight or slightly curved, measuring 3–7.5 cm in length. The pod is pubescent (hairy) and typically contains 2–4 seeds, though the number can range from 1 to 4. At maturity, the pod turns from green to yellow or brown.

Seeds: The seeds are the economically valuable part of the plant. They are typically spherical, oval, or ellipsoid in shape, with a hard, smooth seed coat. Seed color varies widely depending on the cultivar and includes yellow, green, brown, black, and bicolored patterns. Yellow-seeded varieties are the most common for commercial oil and protein production, while black-seeded varieties (black soybean) are increasingly recognized for their superior nutritional and health benefits. The hilum (the seed scar marking the point of attachment) is typically small and may be colorless, brown, black, or yellow.

Cultivation and Hardiness: Soybean is adapted to a wide range of climates and soil types, which has contributed to its global spread . It thrives in warm, temperate, and tropical regions with adequate rainfall or irrigation. The plant’s ability to fix nitrogen makes it a valuable crop for sustainable agriculture and crop rotation systems.

Taxonomic Note: The species was originally described by Carl Linnaeus as Phaseolus max L. in 1753. It was later reclassified as Glycine max (L.) Merr. by Elmer Drew Merrill in 1917 . The species epithet max means “largest,” referring to the relatively large seeds compared to other Glycine species.

 Common names (including Nigerian)

• English: Soybean, Soya bean, Soy, Edamame (young, green pods)
• Hausa: Waken suya (soya bean)
• Yoruba: Waken Soya   or by the English name)
• Igbo: Agwa Soya 
• French: Soja
• German: Sojabohne
• Spanish: Soja, Soya, Frijol de soya
• Portuguese (Brazil): Soja
• Italian: Soia

Note on Black Soybean: Black soybean (Glycine max (L.) Merr.) is a specific seed coat color variant of the same species, increasingly recognized for its higher antioxidant content and superior health benefits compared to yellow soybean .

 Health Benefits

Soybean is one of the most extensively studied food crops for its health benefits. It is often referred to as the “golden bean” or “miracle crop” because of its nutritional richness and versatility. A 2024 systematic review in Food Frontiers confirmed that black soybean (a seed coat variant) possesses “superior nutritional and health benefits, compared to yellow soybean”. However, while some benefits are well-supported, the U.S. Food and Drug Administration (FDA) has not reviewed soy supplements for safety and effectiveness, and their benefits for most uses are not well defined.

1. Nutritional Composition (“Complete Protein Source”)

Soybean is a nutrient-dense legume unique for its high protein content and complete amino acid profile, making it a valuable plant-based protein source .

• Proximate Composition (per 100g of mature, dry seeds):
• Protein: 35–45% 
• Fat (Lipids): 18–22%
• Carbohydrates: 20–30%
• Dietary Fiber: 8–15%
• Amino Acid Profile: Soy protein is a complete protein, meaning it contains all nine essential amino acids in adequate amounts. This distinguishes it from most other plant proteins and makes it comparable to animal protein sources. Soy protein is particularly rich in lysine, which is often limiting in cereal grains, making the combination of soy with grains (rice, maize, wheat) nutritionally complementary.
• Isoflavones: Soybeans are uniquely rich in isoflavones, a class of phytoestrogens (plant compounds with estrogen-like activity). The primary isoflavones in soy are genistein, daidzein, and glycitein . These compounds are responsible for many of the purported health benefits of soy, as well as some of the controversies surrounding its use.
• Other Bioactive Compounds: Black soybean, in particular, contains high levels of anthocyanins (the pigments responsible for its dark color), polyphenols, flavonoids, and saponins, which contribute to its antioxidant and health-promoting properties .
• Cardiovascular Health and Cholesterol Reduction

This is one of the most well-documented health benefits of soy consumption.

Key findings:

• The Italian Society of Diabetology (ISD) and the Italian Society for the Study of Arteriosclerosis (ISSA) state that soy supplementation for cholesterol-lowering purposes may be advised in the general population and in patients with mild hypercholesterolemia who have low to moderate cardiovascular risk .
• This recommendation is based on low-level evidence with some level of uncertainty .
• The cholesterol-lowering effect is attributed to soy protein and, to a lesser extent, soy isoflavones.
• Some studies suggest that taking soy supplements may help reduce bone loss after menopause.

Limitation: Evidence is lacking to definitively support the use of soy for treating heart disease.

• Menopausal Symptom Relief (Hot Flashes)

Soy isoflavones, as phytoestrogens, have been studied for their ability to mimic some of the effects of estrogen in the body, potentially alleviating menopausal symptoms.

Key findings:

• Some studies show that taking soy supplements may help reduce menopause-related hot flashes by a small amount.
• The benefits are only seen with soy supplements; eating soy as part of the diet is not likely to help with menopause-related health problems.
• It is not clear what dose of soy is most likely to provide benefits or which substances in soy are most important.
• Evidence is lacking to support the use of soy for treating other menopausal symptoms or osteoporosis.
• Antioxidant Properties (Black Soybean)

Black soybean, with its dark seed coat, has superior antioxidant properties compared to yellow soybean.

Key findings:

• The anthocyanins in black soybean seed coats are potent free radical scavengers.
• The review notes that the “bioactive compounds in BS associated with health benefits” and that “various processing technologies have been applied to BS” to enhance these properties.
• These antioxidant properties may contribute to the prevention of oxidative stress-related chronic diseases.
• Diabetes and Blood Sugar Regulation

Soy has been studied for its potential role in diabetes management.

Key findings:

• Evidence is lacking to support the use of soy in the treatment of diabetes .
• However, the high protein and fiber content of soy foods can contribute to glycemic control by slowing carbohydrate absorption.
• Bone Health (Osteoporosis)

Soy has been investigated for its effects on bone density, particularly in postmenopausal women.

Key findings:

• Some studies suggest that soy isoflavones may help reduce bone loss after menopause, but evidence is not definitive.
• Evidence is lacking to support the use of soy in the treatment of osteoporosis.
• Other Potential Health Benefits

Research has explored soy for several other indications, but evidence remains limited:

Condition	Level of Evidence
Irritable bowel disease	Limited benefit demonstrated
Polycystic ovary syndrome (PCOS)	Limited benefit demonstrated
Chronic kidney disease	Limited benefit demonstrated
Asthma	Lacking
Obesity	Lacking

• Traditional Medicinal Uses (Nigeria and Africa)

In Africa, soybean has been incorporated into traditional medicine practices, building on indigenous knowledge:

• Nigeria (Yoruba): A decoction (boiled extract) of fresh soybean leaves is brewed to relieve coughs and colds. The leaves are simmered for 15 minutes before straining.
• Ghana (Ewe people): A poultice (soft, moist mass) of chopped soybean leaves is applied to skin infections and minor wounds to promote healing.
• China: A decoction of soybean seeds and leaves is used to support kidney function and alleviate urinary tract discomfort. The mixture is boiled for 20 minutes and consumed as a mild tea.
• Antimicrobial Properties

Research has documented antimicrobial activities of soybean extracts, which support the traditional use of leaf poultices for skin infections. However, detailed clinical evidence is limited.

Summary of Scientific Evidence

Use	Level of Evidence
Cholesterol reduction (mild hypercholesterolemia)	Low-level evidence, may be advised
Menopausal hot flashes (supplements only)	Some benefit, small effect size
Bone loss reduction (postmenopausal)	Inconclusive
Diabetes, asthma, obesity	Lacking
PCOS, CKD, IBS	Limited benefit demonstrated

1. Supports Weight Management

Its high protein and fiber content increase satiety and may help control appetite and body weight.

1. Improves Digestive Health

The dietary fiber in soybeans:

• Promotes bowel regularity
• Supports beneficial gut bacteria
• Reduces constipation
• Supports Brain Function

Soybeans contain lecithin and essential fatty acids that contribute to healthy brain and nervous system function.

Other benefits

• Livestock Feed: Soybean meal (the residue left after oil extraction) is a high-protein animal feed used extensively for poultry, swine, and cattle. The fresh stems and leaves can also be used as forage or silage.
• Edible Oil Production: Soybean oil is one of the most widely consumed vegetable oils globally. It is used for cooking, frying, salad dressings, margarine, and shortening. Industrial uses include the production of biodiesel, soaps, glycerol, paints, printing inks, and plastics.
• Industrial and Biofuel Applications:
  • Biodiesel: Soybean oil is a major feedstock for biodiesel production.
  • Lubricants and solvents: Industrially, soybean oil is used in the manufacture of soaps, glycerol, paints, and printing inks .
  • 3D Printing: Emerging research suggests soy protein may be used as a constituent in 3D printing materials .
• Soil Improvement and Nitrogen Fixation: Soybean is a valuable green manure and cover crop. Its ability to fix atmospheric nitrogen through symbiotic relationships with Bradyrhizobium bacteria reduces the need for synthetic nitrogen fertilizers, lowers production costs, and improves soil fertility for subsequent crops in rotation .
• Food Processing and Manufacturing:
  • Soy flour and grits: Used as an ingredient in baked goods, pasta, and meat products to improve texture and increase protein content.
  • Soy protein concentrate and isolate: Used in meat analogs (plant-based meat substitutes), protein bars, beverages, and nutritional supplements.
  • Lecithin: A byproduct of soybean oil processing, used as an emulsifier in chocolate, baked goods, and cosmetics.
• Ornamental Use: Mature soybean plants are not typically grown ornamentally, but the young pods (edamame) are valued for their visual appeal in vegetable gardens.
• Economic Importance: Soybean is one of the most economically significant crops globally. Brazil is the world’s largest exporter, followed by the United States and Argentina . In Nigeria, intercropping trials with soybean and other crops have demonstrated agronomic and economic potential.
• Cosmetics and Pharmaceuticals: Soy lecithin and soy-derived compounds (including isoflavones) are used in skincare products, hair conditioners, and as emulsifiers in pharmaceutical preparations. Black soybean seed coats are being explored as “bioactive ingredients in pharmaceutical products”.

 How it is used

Culinary uses (Nigerian and global context):

Whole Soybeans (Mature Dry Beans):

• Cooked soybeans: Dry beans must be soaked overnight and thoroughly boiled (typically for 2-4 hours) to soften and deactivate antinutrients. They can then be added to soups, stews, and salads, or mashed into spreads. In Nigeria, soybeans are increasingly incorporated into traditional dishes to boost protein content.
• Roasted soybeans: Dry soybeans can be roasted and eaten as a crunchy, high-protein snack (similar to roasted groundnuts).

Edamame (Green Vegetable Soybeans):

• Preparation: Young, green pods (harvested before maturity) are boiled in salted water for 5–10 minutes. The pods are served whole, and the beans are squeezed out of the pod directly into the mouth.
• Serving: Edamame is a popular appetizer in Japanese cuisine and is increasingly available internationally as a healthy snack.

Soy-based Products (Fermented and Non-fermented):

Product	Description
Tofu (Bean Curd)	Soy milk is coagulated (using calcium sulfate, magnesium chloride, or nigari), and the resulting curds are pressed into blocks of varying firmness. Used in stir-fries, soups, stews, and as a meat substitute.
Soy Milk	Ground soybeans are boiled, filtered, and the resulting liquid is consumed as a dairy milk alternative.
Tempeh	Fermented whole soybeans formed into a firm, nutty-flavored cake. High in protein and probiotics.
Miso	A fermented soybean paste used as a soup base and seasoning.
Natto	Fermented whole soybeans with a sticky, stringy texture and strong flavor. Common in Japanese cuisine.
Soy Sauce (Shoyu)	A dark, salty liquid condiment produced by fermenting soybeans, wheat, salt, and a mold culture (Aspergillus oryzae).
Textured Vegetable Protein (TVP)	Defatted soy flour is processed into a dry, granular product that rehydrates to a meat-like texture. Used as a meat extender or substitute in chili, tacos, and burgers.

Soybean Flour:

• Used in baked goods (bread, cookies, cakes) to increase protein content and improve moisture retention.
• Can be blended with cereal flours for gluten-free baking applications.

Soybean Oil:

• The most widely used cooking oil globally. Suitable for frying, sautéing, baking, and salad dressings.

Specific Nigerian Soybean Recipes

1. Soy Milk (Popular Street and Home Drink)**
   • **Ingredients** (makes about 1.5 litres):
     1. 1 cup whole soybeans
     1. 6–8 cups water
     1. Sugar or honey to taste (optional)
     1. Vanilla flavor or date (optional)
2. **Method**:
   • Sort and soak soybeans in water overnight (8–12 hours). Peel the skin.
   • Blend peeled beans with 4 cups of fresh water until smooth.
   • Strain through a cheesecloth or fine sieve, squeezing out the milk.
   • Boil the milk for 10–15 minutes, stirring constantly to avoid burning. Add sugar and flavoring.
3. **Served**: Warm or cold, often with akara or bread. Popular for children and as a milk substitute.
4. Soy Akara (Soya Bean Cakes)**
   • **Ingredients** (serves 4–6):
     1. 2 cups soaked and peeled soybeans
     1. 1 onion
     1. 2–3 Scotch bonnet peppers
     1. Salt and seasoning to taste
     1. Vegetable oil for frying
   • **Method**:
     • Blend peeled soybeans with onion and peppers into a thick paste.
     • Whisk the paste vigorously for 10 minutes to make it light and fluffy.
     • Add salt. Fry small scoops in hot oil until golden brown.
     • **Served with**: Pap (ogi), bread, or garri.
5. Soy Moi-Moi (Steamed Soya Pudding)**
   • **Ingredients** (serves 6):
     1. 2 cups soybean flour or peeled blended beans
     1. ½ cup palm oil or vegetable oil
     1. 2 onions, 3 peppers
     1. Salt, seasoning cubes, crayfish (optional)
     1. Boiled eggs, fish, or corned beef (optional)
   • **Method**:
     • Blend soaked peeled soybeans with onions and peppers.
     • Mix in oil, seasonings, and additives.
     • Pour into leaves, foil, or plastic containers and steam for 45–60 minutes.
   • **Served with**: Rice, pap, or as a snack.
6. Soy Ogi / Pap (Nutritious Weaning Food)**
   • Mix fresh soy milk or soy flour into traditional pap (ogi) during preparation. This enriches the pap with protein for children and nursing mothers.
7. Soya Stew / Soya Granules in Soup**
   • Cook minced or whole boiled soybeans with tomatoes, peppers, onions, and spices like regular stew. Used as a meat substitute in soups or with rice and beans.

Traditional Medicinal Preparations (Africa):

Condition	Plant Part Used	Preparation Method	Region
Coughs and colds	Fresh leaves	Decoction: Simmer leaves for 15 minutes, strain	Nigeria (Yoruba)
Skin infections, minor wounds	Leaves	Poultice: Chopped leaves applied topically	Ghana (Ewe)
Kidney function, urinary discomfort	Seeds and leaves	Decoction: Boil mixture for 20 minutes, consume as mild tea	China

Preparation methods summary:

• Decoction: Plant parts (leaves, seeds) are boiled in water, and the resulting liquid is consumed orally.
• Poultice: Chopped or crushed leaves are applied directly to the skin.
• Soaking and boiling: Whole dry beans require overnight soaking followed by prolonged boiling (2–4 hours).

Side Effects / Caution

1. General Safety Profile (Favorable for Food, Uncertain for Supplements)

Soybeans and their products have “generally recognized as safe” (GRAS) status when used as food . However, the FDA has not reviewed soy supplements for safety and effectiveness, and their benefits for most uses are not well defined.

Key points:

• Dietary consumption of soy foods (tofu, tempeh, edamame, soy milk) is considered safe for the general population.
• Soy supplements (isoflavone extracts, protein concentrates) have less established safety profiles and should be used with caution.
• The amount of each chemical in a specific soy product can vary depending on the area where the plant was grown, weather conditions, harvesting time, and processing method .
• Adverse Reactions (Generally Mild)

Soybeans and their products are generally well tolerated.

Common side effects:

• Gas and upset stomach (flatulence, bloating) are the most common side effects, particularly in individuals not accustomed to a high-legume diet.

Serious side effects (rare):

• Allergic reactions: Soy is a common food allergen. Symptoms can include breathing problems, facial swelling, hives, itching, nausea, vomiting, dizziness, and anaphylaxis in severe cases.

Cross-reactivity:

• Some individuals with peanut allergy may also have an allergic reaction to soy .
• Cross-sensitivity between poly-gamma-glutamic acid of fermented soybeans and jellyfish has been documented in several case reports .
• Hormonal Concerns (Estrogen-Dependent Cancers)

This is the most significant and debated caution associated with soy consumption.

Key safety considerations from Drugs.com and WebMD:

Population	Recommendation
Women with current or history of estrogen-dependent tumors (e.g., breast cancer)	Consult physician prior to consuming soy in amounts higher than those typically found in food
Men consuming soy	An increased risk of some cancers has been documented
General population	Most research shows that eating soy-based foods does not increase the risk for breast cancer, even in people who have had or currently have breast cancer

Important distinction: The risks apply primarily to high-dose soy supplements, not to dietary consumption of whole soy foods. Women with breast cancer should speak to a healthcare provider before taking soy supplements .

• Thyroid Function (Goitrogens)

Soybeans contain natural goitrogens (substances that can interfere with thyroid function) .

• Soy can cause hypothyroidism in susceptible patients, particularly those with pre-existing thyroid conditions or iodine deficiency.
• Individuals taking thyroid medication should separate soy consumption from medication intake by several hours.
• Pregnancy and Lactation
• Food use: Soy has GRAS status when used as food .
• Supplement use: Avoid dosages above those found in food; safety and efficacy have not been established .
• Soy isoflavones (daidzein and genistein) are passed into breast milk.
• Infant formula: The European Society of Pediatric Gastroenterology, Hepatology, and Nutrition (ESPGHAN) and the American Academy of Pediatrics (AAP) recommend amino acid–based and extensively hydrolyzed infant formulas over infant soy formula in non-breastfed infants with cow’s milk protein allergy. A soy formula may be considered in infants on a vegan diet.
• Drug Interactions

Well-documented interactions are limited, but caution is advised :

• Estrogen derivatives (hormone replacement therapy, oral contraceptives): Soy isoflavones have estrogenic activity and may interact with these medications.
• Thyroid medication: Soy may interfere with absorption.
• Warfarin (blood thinner): Soy products may theoretically affect warfarin efficacy, though evidence is limited.

Recommendation: Tell your healthcare provider about any medicines you are taking before using soy supplements, especially if you are using hormone replacement therapy or any medicines containing hormones.

• Antinutrients and Proper Processing

Raw soybeans contain several antinutritional factors that must be deactivated by heat treatment:

Antinutrient	Effect	Reduction Method
Trypsin inhibitors	Inhibit protein digestion	Thorough cooking/boiling
Lectins (phytohaemagglutinin)	Can cause red blood cell agglutination and digestive distress	Thorough cooking
Phytic acid	Binds minerals (iron, zinc, calcium), reducing absorption	Soaking, fermentation, cooking

Recommendation: Never consume raw soybeans. Boiling, roasting, steaming, and fermentation effectively deactivate these compounds. Traditional fermented products (tempeh, miso, natto) have reduced antinutrient levels and enhanced bioavailability.

• Moderation and Supplement Use
• Dietary consumption of whole soy foods is safe and encouraged as part of a balanced diet.
• Soy supplements (isoflavone extracts, protein isolates) should be approached with caution, particularly at high doses and long-term use.
• The benefits of soy supplements for most indications are not well defined, and evidence is lacking.

References

• “Glycine max – Soybean.” Cultivar Magazine, 4 July 2025, revistacultivar.com/plant-health/glycinemax.
• “Glycine max (L.) Merr. (species) – Taxonomy, Distribution, Uses & Phytochemicals.” PlantaeDB, plantaedb.com/taxa/phylum/angiosperms/order/fabales/family/fabaceae/subfamily/papilionoideae/genus/glycine/species/glycine-max. Accessed 26 May 2026.
• “Soy (Glycine max): Uses, Side Effects, Interactions, Pictures, Warnings & Dosing.” WebMD, 13 Feb. 2026, www.webmd.com/vitamins-supplements/soy.
• “Soy.” Drugs.com, 12 Nov. 2025, www.drugs.com/npp/soy.html.
• “蔬菜－毛豆 [Vegetable – Edamame].” 農業知識入口網, kmweb.moa.gov.tw/techcd/%E4%BD%9C%E7%89%A9%E7%97%85%E8%9F%B2%E5%AE%B3%E8%88%87%E8%82%A5%E5%9F%B9%E7%AE%A1%E7%90%86%E6%8A%80%E8%A1%93%E8%B3%87%E6%96%99/%E8%94%AC%E8%8F%9C/%E6%9E%9C%E8%8F%9C%E9%A1%9E/%e6%af%9b%e8%b1%86/%e6%af%9b%e8%b1%86%e7%b0%a1%e4%bb%8b.htm. Accessed 26 May 2026.
• Anderson, James W., et al. “Meta-Analysis of the Effects of Soy Protein Intake on Serum Lipids.” New England Journal of Medicine, vol. 333, no. 5, 1995, pp. 276–282.
• Food and Agriculture Organization. Soybean and Soy Products in Human Nutrition. FAO Agricultural Services Bulletin, Food and Agriculture Organization of the United Nations, Rome.
• He, FJ, and J. MacGregor. “Effect of Soy Protein and Isoflavones on Blood Pressure and Serum Lipids: A Review of Randomized Controlled Trials.” Journal of Human Hypertension, vol. 19, no. 4, 2005, pp. 257-265.
• International Institute of Tropical Agriculture (IITA). Soybean Production in West Africa: Agronomy, Processing, and Utilization. IITA Research Monograph, 2021.
• International Institute of Tropical Agriculture. Soybean Production Manual for Nigeria. IITA Publications, Ibadan, Nigeria.
• Kew Science. “Glycine max (L.) Merr.” Plants of the World Online, Royal Botanic Gardens Kew, powo.science.kew.org/taxon/urn:lsid:ipni.org:names:5268649-1. Accessed 26 May 2026.
• Li, Shiyu, et al. “A Systematic Review of Black Soybean (Glycine max (L.) Merr.): Nutritional Composition, Bioactive Compounds, Health Benefits, and Processing to Application.” Food Frontiers, 2024. FAO AGRIS, agris.fao.org/search/en/records/67597814c7a957febdf7ed4b.
• Liu, KeShun. Soybeans: Chemistry, Technology, and Utilization. Chapman & Hall, 1997.
• Messina, Mark. “Insights Gained from 20 Years of Soy Research.” Journal of Nutrition, vol. 140, no. 12, 2010, pp. 2289S–2295S.
• Michelfelder, Aaron J. “Soy: A Complete Review of Health Benefits and Risks.” American Family Physician, vol. 79, no. 1, 2009, pp. 43-47.
• Olowe, V. I. O., et al. “Potential of Intercropping Soybeans (Glycine max (L.) Merrill) and Cowpea (Vigna unguiculata L. Walp) with Sunflower (Helianthus annuus L.) in the Transition Zone of South West Nigeria.” Tropical Agricultural Research and Extension, vol. 9, 2006, pp. 91-102. SLOL, doi:10.4038/tare.v9i0.5409.
• Singh, Guriqbal, editor. The Soybean: Botany, Production and Uses. CABI Publishing, 2010.
• Tukura, B. W., et al. “Nutritional and Anti-Nutritional Evaluation of Fermented Soybean (Glycine max) Condiments Used in Nigerian Food Preparations.” African Journal of Food Science, vol. 15, no. 3, 2021, pp. 88-96.
• Wilson, Richard F. “Soybean: Market Driven Research Needs.” In Genetics and Genomics of Soybean, Springer, 2008, pp. 3–15.