Description

Psidium guajava, commonly known as common guava, yellow guava, lemon guava, or apple guava, is an evergreen shrub or small tree belonging to the Myrtaceae family and genus Psidium. It is a perennial plant that thrives in sunny or warm conditions, typically growing to heights of 3-10 meters with an open crown, though it can reach up to 10 meters in ideal environments. . The bark is distinctive, being smooth, copper-colored, and peeling off in thin flakes, revealing a greenish layer beneath.

The plant features smooth, often peeling bark, and aromatic, oval-shaped, opposite leaves that are spade-shaped, olive-green, and 5-15 cm long. Flowers are small, white with showy stamens, pollinated mainly by insects like the common honey bee (Apis mellifera), and arranged in clusters. The fruit is edible, ranging in shape from round, ovoid, or pear-shaped, 2-10 cm long, with sizes from apricot-like to grapefruit-sized; skin is usually green or yellow, but some cultivars have red skin, and flesh can be white, pink, or red. Seeds are numerous and hard. The wood is dense (about 670 kg/m³ when oven-dry) and resistant to insects and fungi. From seed, plants grow slowly initially but accelerate, blooming in 2-8 years.

Native to the Caribbean, Central America, and South America, Psidium guajava has been widely distributed and cultivated in tropical and subtropical regions worldwide, including Africa, Asia, and the Pacific. It adapts to various habitats like roadsides, grasslands, and elevations from sea level to 1,600 meters, preferring humid grasslands but tolerating drought and poor soils. In some areas, such as the Galápagos Islands, it has become invasive. Cultivation is straightforward; it can be grown in containers in temperate zones, propagated via seeds, cuttings, grafting, or air layering for commercial purposes. Trees begin fruiting 3-4 years after planting, with yields of 50-80 lbs per tree annually in places like Florida. It is highly adaptable but less predictable in blooming and fruiting in non-tropical areas.

Chemically, the leaves contain flavonoids like quercetin, morin, morin-3-O-lyxoside, morin-3-O-arabinoside, and quercetin-3-O-arabinoside, along with essential oils (e.g., 1,8-cineole, β-caryophyllene, α-pinene, limonene), phenolics (e.g., gallic acid, catechin, epicatechin), polysaccharides, triterpenoids, sesquiterpenoids, glycosides, alkaloids, and saponins. The fruit is rich in vitamin C, fiber, antioxidants, potassium, and vitamin A. Nutritional composition per 100g of raw fruit includes about 68 calories, 14g carbohydrates (5g fiber), 2.6g protein, and negligible fat. Leaves have higher mineral content (e.g., calcium 1660 mg, potassium 1602 mg per 100g dry weight) and vitamins (e.g., 103 mg ascorbic acid) compared to fruit.

Other Names

  • English: Guava, Apple Guava, Common Guava, Yellow Guava, Lemon Guava
  • Spanish: Guayaba, Guayabo
  • French: Goyave, Goyavier
  • Portuguese: Goiaba, Goiabeira
  • Hindi: Amrood (अमरूद)
  • Sanskrit: Perala, Amritaphala
  • Arabic: Jawāfa (جوافة), Guava
  • Mandarin Chinese (中文): Fān shì guǒ (番石榴)
  • Swahili: Mapera, Mgwava
  • Tamil: Koyya (கொய்யா)
  • Tagalog (Philippines): Bayabas
  • German: Guavenbaum, Guayave.
  • Japanese: Banjiro.
  • Yoruba (Nigeria): Gova or Goba 
  • Hausa (Nigeria): Gwaiba 
  • Igbo (Nigeria): Gova 

Health Benefits

Psidium guajava offers numerous health benefits, primarily from its fruit and leaves, supported by traditional uses and scientific studies. The fruit and leaves are rich in vitamin C (up to 103 mg/100g dry weight in leaves), fiber, antioxidants, potassium, and vitamin A, providing about 68 calories per 100g raw fruit with 14g carbohydrates (5g fiber) and 2.6g protein. Leaves have higher minerals like calcium (1660 mg/100g DW) and potassium (1602 mg/100g DW).

  1. Immune System Boost: Guava is one of the richest natural sources of Vitamin C, containing over four times the amount found in oranges. Vitamin C is crucial for a healthy immune system, aiding in the prevention of infections and speeding up recovery.
  2. Digestive Health: The fruit is an excellent source of dietary fiber, which helps regulate bowel movements and prevent constipation. Furthermore, guava leaf extract has been shown to have antimicrobial and anti-spasmodic properties, which can help reduce the duration and severity of diarrheal illnesses. The gastric emptying in models at 50-750 mg/kg, combating pathogens like E. coli.
  3. Blood Sugar Regulation: Several studies suggest that guava leaf tea can improve insulin sensitivity and help lower blood sugar levels. The high fiber content in the fruit also helps prevent rapid spikes in blood glucose. Theantidiabetic properties involve lowering blood glucose, improving insulin resistance, lipid profiles, and α-glucosidase inhibition (up to 99.54% at 100 μg/mL), reducing glycated hemoglobin, and protecting pancreatic cells.
  4. Heart Health: The combination of potassium, soluble fiber, and antioxidants in guava contributes to cardiovascular health. Potassium helps regulate blood pressure, while fiber helps lower LDL (“bad”) cholesterol levels.
  5. Antioxidant and Anti-inflammatory Power: Guava is rich in antioxidants like Vitamin C, flavonoids (e.g., quercetin), and carotenoids (e.g., lycopene in pink guava). These compounds combat oxidative stress and chronic inflammation, which are linked to various diseases.The antioxidant activity scavenges radicals (DPPH 56-86%, ABTS 51.73%), reduces oxidative stress, lipid peroxidation, and protects against H2O2 damage.
  6. Oral Health: The anti-inflammatory and antimicrobial properties of guava leaves are beneficial for oral health. A decoction of the leaves is traditionally used as a mouthwash to relieve toothache, gum inflammation, and mouth ulcers.
  7. Anticancer Properties: The anticancer effects include inhibiting cell lines like breast (MDA-MB-231, MCF-7), cervical (HeLa), prostate (LNCaP, DU145, PC-3), colon (COLO320DM, HCT116), colorectal (Caco-2, HT-29, SW480), hepatocellular (HepG2), and glioblastoma (U-118 MG) via apoptosis, cell cycle arrest, antiangiogenesis, and targeting proteins like CDK2, EGFR.
  8. Antimicrobial Activity: Guava leaf extract exhibits antibacterial and antifungal properties, effective against Staphylococcus aureus, Escherichia coli, and Candida albicans, with MICs 0.79-15 mg/mL.
  9. Wound Healing and Skin Health: Guava leaf paste and extracts promote wound healing, prevent infections, and are used in traditional skincare to reduce acne and blemishes. 
  10. Other benefits: hepatoprotective (reduces ALT/AST), antiobesity (lowers lipids), anti-inflammatory, antimalarial, antispasmodic, antihypertension, menstrual cramp relief, flu inhibition, osteoarthritis protection, and platelet increase in dengue.

Other Benefits

  • Culinary Versatility: The fruit is consumed fresh and is also processed into a wide array of products, including jams, jellies, juices, nectar, and desserts. In many cuisines, it is used to make candies, chutneys, and sauces.
  • Timber and Ornamental Use: The wood is used for small carpentry projects and as firewood. The tree is also planted for its attractive bark, flowers, and fruit.
  • Cosmetic Industry: Guava seed oil is used in cosmetics and skincare products for its moisturizing and antioxidant properties.
  • Economic Benefits: It supports economies through fruit production (fresh sales, juices, nectars) and processing, creating jobs and boosting commerce in regions like India, Brazil, and Costa Rica.
  • Livestock: Leaves serve as fodder, improving livestock and poultry nutrition (e.g., egg quality in hens).
  • Environmental Benefit:: It has a positive impact in pastures, aiding soil stabilization and biodiversity, though invasive in some areas. The plant is hardy, tolerates drought, and can be used for reforestation or as an ornamental tree in tropical gardens.  Fibers and by-products are used in composites, biosorbents, and biofuels.
  • Industrial: Leaves act as catalysts for biodiesel, preservatives, and in packaging; wood for carpentry and toys; and overall valorization reduces waste.
  • Nutritional Value: Guava is a nutritious fruit rich in vitamins A and C, potassium, and dietary fiber. It is used as a healthy snack or ingredient in juices, jams, and desserts. 

How it is Used

  • Culinary:
    • Fruit:
      • Raw: Eaten fresh, often with the skin on. The seeds are also edible.
      • Processed: Juiced, canned, or cooked into jams, jellies, and pies, toffees, pickles, wines.
    • Leaves:
      • Leaves in teas or as preservatives in sausages, chocolates, jellies, beverages.
  • Medicinal:
    • Leaves:
      • Herbal Tea: Dried guava leaves are steeped in hot water to make a therapeutic tea, primarily for digestive issues and blood sugar management.
      • Decoction: Leaf decoctions are used treatment of for diarrhea, diabetes, cough, cramps;
      • Topical Application: A poultice or wash made from crushed leaves is applied to wounds, ulcers, and skin sores for its antimicrobial properties. It is also applied orally for dengue (platelet increase), respiratory issues; supplements for antioxidants.
      • Mouthwash: A decoction of the leaves is cooled and used as a gargle for sore throats and mouth infections.
    • Roots and Bark:
      • Used in some traditional preparations for treating dysentery and as an astringent. 
  • Industrial:
    • Leaves:
      • Used for the encapsulation in foods, coatings, packaging
      • The by-products are used for animal feed, biofuels, catalysts
    • Wood:
      • For construction of light furniture and toys.
      • Cultivation as landscape specimen or hedge.

Side Effects / Caution

Guava is generally very safe when consumed as a food. However, there are a few considerations for medicinal use.

  1. Digestive Issues: While the fiber is beneficial, consuming excessive amounts of guava, especially if you are not used to a high-fiber diet, can lead to bloating or digestive discomfort. Constipation could arise due to high tannin content in leaves. 
  2. Blood Sugar Interaction: Due to its potential blood sugar-lowering effects, individuals with diabetes who are on medication should monitor their blood glucose levels closely when consuming guava leaf extract or tea to avoid hypoglycemia.
  3. Pregnancy and Breastfeeding: There is insufficient reliable information on the safety of using medicinal amounts of guava leaves during pregnancy or breastfeeding. Consuming the fruit in normal food amounts is considered safe.
  4. Dosing and Drug Interaction: Leaves or bark in high doses may cause mild toxicity. It may lower blood sugar (interact with diabetes meds) or blood pressure.
  5. Fructose Content: The fruit contains fructose, and individuals with fructose intolerance should consume it in moderation.
  6. Allergy: Although rare, some individuals may be allergic to guava.

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