Green bell pepper

Green Bell Pepper (Capsicum annuum L.): A Comprehensive Reference

1. Identity, Taxonomy, and Nomenclature

Green bell peppers, also known as Capsicum annuum, are a popular vegetable native to Central and South America. Capsicum annuum is a flowering plant of the nightshade family (Solanaceae), widely cultivated for the hot or mild peppers of its thousands of varieties and cultivars. The full botanical classification for green bell peppers is Capsicum annuum var. annuum, specifying the variety and species.

Capsicum annuum is the most economically important of the species in the Capsicum genus. Its common forms include bell, poblano, cayenne, pimiento (including those used to make paprika), jalapeño, serrano, and various other chili peppers. The green bell pepper is the immature, unripe fruit of the plant. Green and red peppers are actually the same pepper — the red peppers have simply been allowed to mature on the plant longer, which changes their color, makes them sweeter, and lets them develop a higher vitamin C content.

The bell pepper is the only member of its genus (Capsicum) that does not produce the chemical capsaicin, which gives "hot" pepper its characteristic burning sensation; the absence of capsaicin is due to a recessive form of a gene. Bell pepper is therefore classified as a non-pungent form. A genetic recessive non-pungent form has become an important "green" vegetable crop on a global scale, especially in temperate regions.

Common names for green bell pepper include:

• Sweet pepper — used to distinguish bell peppers from hot or spicy peppers.
• Pimiento verde — the Spanish-language designation.
• Capsicum — used as a common name in New Zealand, Australia, and India.
• Green pepper, bell capsicum.

Peppers are technically fruits (berries), although they are perceived, prepared, and partaken as vegetables in the culinary world, similar to tomatoes, cucumbers, and zucchini.

2. Botanical Description and Cultivation

The plant is an herb or small shrub that grows to a height of 0.3–1.2 metres (1–4 feet) and a width of 15–30 cm (6–12 inches). Peppers grown in temperate regions are herbaceous annuals, but are herbaceous perennials where temperatures do not drop below freezing. The pepper plant's growth habit may be prostrate, compact, or erect, and it is determinate in that after producing nine to eleven leaves a single stem terminates in flowers.

Peppers are non-climacteric, meaning they do not produce ethylene; they need to stay on the vine to continue the ripening process. Total pepper production increased significantly (25%) from 2006 to 2016, and pepper is one of the most commercially cultivated vegetable crops worldwide.

3. Common Forms and Preparations

The fruits of this species are integral ingredients in the cuisines of many countries worldwide. The plant is also grown as an ornamental or as a source of medicine. Peppers can be eaten raw, cooked, pickled, roasted, or dehydrated. Also called sweet peppers or capsicums, bell peppers can be eaten raw or cooked. Bell peppers are sometimes dried and powdered.

As a dietary supplement ingredient and food-pharmaceutical material, green bell pepper is utilized in several forms:

• Fresh fruit: consumed raw in salads or crudités, or used in cooking.
• Dried and powdered: dried powder for use as paprika-type colorings or flavors.
• Extracts: recovery of bell pepper phytochemicals offers a viable strategy to obtain bioactive compounds that could be used as natural ingredients for the food and pharmaceutical industries, as an alternative to replacing synthetic compounds.
• Seed and peel by-products: after processing bell pepper products, waste remains (seeds, peel, stem, and leaves), representing desirable raw material to obtain phytochemical compounds.

4. Traditional and Historical Use

4.1 Pre-Columbian Mesoamerica

The plant was first domesticated by Indigenous peoples in present-day Mexico approximately 6,000–7,000 years ago. Macrofossil data from the Tehuacan Valley site indicates that C. annuum was domesticated in Mexico at approximately the same time as the domestication of other Capsicum species in Ecuador. The excavated cave floors at Guila Naquitz and Silvia's Cave in Oaxaca, Mexico, yielded a collection of 122 chili peppers that could be dated from CE 600–1521; these well-preserved specimens belonged to both C. annuum and C. frutescens and were found along with other domesticates including avocados, beans, maize, and squash.

Mexico is the center of origin and diversification of domesticated chile (Capsicum annuum L.); chile is conceived and employed as both food and medicine in Mexico. Traditional knowledge, uses, and management of chile as food and medicine form a continuum — they are not separated into distinct categories. The intermingled uses of Capsicum are diversified, deeply rooted, and far-reaching into the past.

Chilies were an important food to many Indigenous populations, including the Aztecs. Chilli and paprika have a long tradition of use in Meso- and South American cultures, famously as a spice, but also as a medicine, including for chronic inflammatory conditions. Multiple medical uses were recorded during the Aztec period, including uses for dental problems, infections of the ear, various types of wounds, and digestive problems.

4.2 Global Spread and European Adoption

Capsicum annuum probably became the dominant pepper globally in part because it was the first pepper discovered by Columbus and other New World explorers. This taxon was the first Capsicum species taken to Europe and quickly spread to other regions. The Iberian Peninsula was the place where pepper (Capsicum annuum) entered Europe and dispersed to other continents, but was also an important secondary center for its diversification.

Peppers are native to Mexico, Central America, and the northern part of South America, though the modern mild bell pepper cultivar was not developed until the 1920s in Hungary. The bell pepper had a recessive gene that halted the plant's capsaicin production, the chemical compound responsible for the hot spicy taste in chili peppers.

4.3 Traditional Medicinal Uses Across Cultures

In addition to the use of capsicum fruits as a food additive, in traditional medicine, it has been used for the treatment of cough, toothache, sore throat, parasitic infections, rheumatism, and wound healing, and has also been utilized as an antiseptic, counterirritant, appetite stimulator, antioxidant, and immunomodulator. Red pepper as a drug is given in atonic dyspepsia and flatulence, due to increasing the motility in the gastric antrum, duodenum, proximal jejunum, and colon.

Capsicum annuum has been widely cultivated and modified through breeding for certain traits, allowing it to be used in multiple applications including food, traditional medicine, cosmetics, and even self-defense (pepper spray).

5. Key Constituents and Active Compounds

5.1 Vitamins

Peppers are good sources of vitamins, having high levels of vitamin C, E (alpha-tocopherol), provitamin A (expressed as mcg of retinol activity equivalents, RAE), and folate. One medium-sized green bell pepper fruit (~100 g fresh weight) contains approximately 180% of the recommended daily amount of vitamin C. Red peppers have twice the vitamin C content and eight times the vitamin A content of a green pepper.

Capsicum (sweet pepper) is also good in the B-complex group of vitamins such as niacin, pyridoxine (vitamin B-6), riboflavin, and thiamin (vitamin B-1). Vitamin K1 (phylloquinone) is important for blood clotting and bone health and is present in bell peppers. Folate (vitamin B9) has a variety of functions in the body. Vitamin E is a powerful antioxidant essential for healthy nerves and muscles, also present in bell peppers.

5.2 Phenolic Compounds and Flavonoids

In general, the concentration of polyphenol compounds in bell peppers varies with variety and color, ranging from 5.59 to 52.65 mg of gallic acid equivalent per gram of edible portion. The main phenolic compounds found in green bell peppers include myricetin (658 µg/g), pyrogallol (572 µg/g), chlorogenic acid (290 µg/g), catechol (279 µg/g), protocatechuic acid (116 µg/g), caffeic acid (108 µg/g), ellagic acid (106 µg/g), and gallic acid (89 µg/g).

The green cultivar had the highest content of caffeic and chlorogenic acids, and myricetin, compared to red and orange cultivars. Quercetin 3-O-α-l-rhamnopyranoside was the main compound in the flavonoid fraction from green pepper. High quercetin 3-O-rhamnoside, luteolin, and other flavonoid glycosides were contained in greater amounts in green pepper than in other colored peppers.

Five hydroxycinnamic derivatives and 23 flavonoids were characterized and quantified from the pericarp of sweet pepper by HPLC-diode array detection-electrospray ionization-mass spectrometry. Hydroxycinnamic derivatives, O-glycosides of quercetin, luteolin, and chrysoeriol, and a large number of C-glycosyl flavones were characterized.

The bioactive compounds reported in bell pepper include phenolic compounds, flavonoids, carotenoids, tocopherols, and polysaccharides with antioxidant, antimicrobial, and immunomodulatory activities. Green, yellow, and red bell peppers have also been found to contain glycerolipids and glycerophospholipids, sphingomyelin compounds, ceramides, glycosides, saponins, and alkaloids.

5.3 Carotenoids

Fresh peppers have exceptionally high quantities of ascorbic acid and their attractive red color is due to several carotenoid pigments that include β-carotene with pro-vitamin A activity and oxygenated carotenoids such as capsantine, capsorubin, and cryptocapsin, which are exclusive to these fruits and have proven to be effective at scavenging free radicals. Red cultivar showed the highest content of total carotenoid, while the green cultivar showed the lowest. The green cultivar contained the greatest amounts of chlorophyll-a and chlorophyll-b; the latter is responsible for the color of green pepper.

Ripe peppers are sweeter and contain more carotenoids, while green peppers have a slightly bitter flavor and are rich in lutein. Green peppers are packed with the chemical compound lutein. Lutein gives certain foods their distinctive yellow and orange coloring and is an antioxidant that has been shown to improve eye health. Specifically, lutein helps strengthen the part of the eye that often becomes damaged by blue light.

Antioxidant flavonoids such as alpha and beta carotenes, lutein, zeaxanthin, and cryptoxanthin are found in sweet peppers. Bell peppers are a rich source of several phytonutrients, including carotenoids (lycopene, lutein, and zeaxanthin) and polyphenols including flavonoids (quercetin and luteolin) and hydroxycinnamic acids.

5.4 Minerals

Bell pepper has adequate levels of essential minerals. Some of the main minerals are iron, copper, zinc, potassium, manganese, magnesium, and selenium. Manganese is used by the body as a co-factor for the antioxidant enzyme superoxide dismutase. Selenium is an antioxidant trace element that also acts as a co-factor for superoxide dismutase.

5.5 Absence of Capsaicin

The bell pepper is the only member of its genus (Capsicum) that does not produce the chemical capsaicin, which gives hot pepper its characteristic burning sensation; the absence of capsaicin is due to a recessive form of a gene. This is a defining characteristic that distinguishes green bell pepper chemically from other Capsicum annuum varieties.

6. Mechanisms of Action of Key Constituents

6.1 Antioxidant Activity

Peppers contain large quantities of neutral phenolic compounds or flavonoids, including quercetin and luteolin. The consumption of these bioactive compounds provides beneficial effects in human health due to their antioxidant properties, which protect against oxidative damage to cells and thus may help prevent the development of common degenerative diseases such as cancer, cardiovascular diseases, cataracts, diabetes, Alzheimer's, and Parkinson's.

Much of the current focus on vitamin C is on its role as an antioxidant. Antioxidant nutrients are thought to provide a buffer against cell damage that occurs during routine cell functions. Together, these antioxidant substances in sweet peppers help protect the body from the injurious effects of free radicals generated during stress and disease conditions.

Pepper extracts showed radical scavenging activities and ameliorated the lipopolysaccharide (LPS)-stimulated inflammatory response by decreasing nitric oxide production and interleukin-6 and tumor necrosis factor alpha levels in RAW 264.7 cells in vitro. It is important to note that this evidence is derived from in vitro cellular studies and has not been confirmed in human clinical trials for green bell pepper specifically.

6.2 Anti-inflammatory Mechanisms

Flavonoids have been shown to have beneficial effects on the prevention of various chronic diseases, including cancers, cardiovascular diseases, and type 2 diabetes, which is attributed principally to their anti-inflammatory and antioxidant effects. The quercetin and luteolin fractions characteristic of green bell pepper are the primary flavonoid mediators of these in vitro anti-inflammatory activities.

6.3 Lutein and Zeaxanthin: Ocular Mechanisms

The role of lutein and zeaxanthin in human health, particularly the health of the eye, is well established from epidemiological, clinical, and interventional studies. They constitute the main pigments found in the yellow spot of the human retina, which protect the macula from damage by blue light, improve visual acuity, and scavenge harmful reactive oxygen species. They have also been linked with reduced risk of age-related macular degeneration (AMD) and cataracts.

It is believed that lutein, zeaxanthin, and meso-zeaxanthin in the macula filter light from reaching the underlying structures in the retina, thereby reducing the risk of light-induced oxidative damage that could lead to macular degeneration.

6.4 Vitamin C: Immune and Connective Tissue Mechanisms

Studies examining the eating habits of large groups of people show that a high intake of vitamin C–rich foods may reduce the risk of cancers of the mouth, pharynx, esophagus, stomach, lung, and pancreas. These are observational findings, and the causal contribution of vitamin C from bell pepper specifically cannot be separated from overall dietary patterns. A potential role for vitamin C in the maintenance of eye health has also been found.

7. Scientific Evidence by Health Area

7.1 Eye Health (Lutein, Zeaxanthin, Vitamin C, Vitamin E)

Lutein and zeaxanthin, carotenoids found in relatively high amounts in bell peppers, may improve eye health when consumed in adequate amounts. They may protect the retina, the light-sensitive inner wall of the eye, from oxidative damage. Regularly consuming foods rich in these carotenoids may reduce the risk of both cataracts and macular degeneration.

The most rigorous human evidence in this area comes from the Age-Related Eye Disease Studies (AREDS and AREDS2), large-scale NIH-funded clinical trials. The AREDS study showed that multi-vitamins rich in antioxidants, plus eye vitamins and minerals, can reduce the risk of progression of moderate to advanced AMD and its associated vision loss. In AREDS2, study participants with early signs of macular degeneration who took a modification of the original supplement containing 10 mg lutein and 2 mg zeaxanthin (with no beta-carotene) every day for the 5-year study period had a 10 to 25 percent reduced risk of AMD progression. These trials used isolated supplements, not green bell pepper per se.

The role of lutein and zeaxanthin in the health of the eye is well established from epidemiological, clinical, and interventional studies. A large number of epidemiological studies support the notion that high dietary intake of lutein is strongly associated with a decreased relative risk of AMD. Moreover, findings from initial observational studies have been followed by placebo-controlled intervention trials showing that dietary modification and supplementation with lutein result in increasing the macular pigment optical density, and may help to improve visual function in patients suffering from AMD.

Evidence strength: The evidence for lutein and zeaxanthin in eye health is among the strongest for any vegetable-derived carotenoid, supported by large RCTs and consistent epidemiological data. However, the AREDS2 trials used isolated supplements at doses (10 mg lutein/2 mg zeaxanthin) considerably higher than typical dietary consumption from bell peppers alone. The extrapolation from isolated supplements to food sources requires caution.

7.2 Antioxidant Activity and Oxidative Stress

The antioxidant activity of green, red, and yellow bell pepper extracts has been classified by research as FRAP > DPPH > ABTS. Bell pepper fruits, seeds, and leaves contain bioactive compounds — phenols, flavonoids, carotenoids, tocopherol, and pectic polysaccharides — that exhibit antioxidant, antibacterial, antifungal, immunosuppressive and immunostimulant properties, and antidiabetic, antitumoral, and neuroprotective activities, and have potential use as functional food additives.

Evidence strength: Most antioxidant evidence for green bell pepper is derived from in vitro laboratory assays (DPPH, ABTS, FRAP radical scavenging). Further studies are required to guarantee the safe use of these compounds and to understand their mechanisms of action in human subjects. As of available literature, human clinical trial data on green bell pepper extracts as standalone antioxidant interventions is limited.

7.3 Cardiovascular Health

Peppers are a source of carotenoids and phenolic compounds widely associated with biological activities such as antimicrobial, antiseptic, anticancer, counterirritant, cardioprotective, appetite stimulator, antioxidant, and immunomodulator. The cardioprotective associations are primarily attributed to the flavonoid, vitamin C, and carotenoid content.

Flavonoids have been shown to have beneficial effects on the prevention of cardiovascular diseases, which is attributed principally to their anti-inflammatory and antioxidant effects.

Evidence strength: Evidence for cardiovascular benefits from green bell pepper specifically is largely indirect — derived from observational studies of flavonoid-rich diets and in vitro studies. No dedicated human RCTs have examined green bell pepper as an isolated cardiovascular intervention in available peer-reviewed literature. Associations from large dietary studies of fruit and vegetable intake cannot be specifically attributed to green bell pepper alone.

7.4 Anti-inflammatory Properties

Scientific evidence shows that bioactive compounds extracted from bell peppers have anti-inflammatory, antidiabetic, antimicrobial, and immunomodulatory effects, among others. Pepper extracts showed radical scavenging activities and ameliorated the lipopolysaccharide (LPS)-stimulated inflammatory response by decreasing nitric oxide production and interleukin-6 and tumor necrosis factor alpha levels in RAW 264.7 cells, with more effective activities noted for pepper leaves than for pepper fruits.

According to the Arthritis Foundation, bell peppers may help to reduce the risk of developing some types of arthritis and other inflammatory health conditions. This is due to two factors: beta-cryptoxanthin and high vitamin C content.

Evidence strength: Anti-inflammatory evidence is primarily from in vitro cell culture studies. The reduction of inflammatory cytokines observed in RAW 264.7 macrophage cultures is a standard in vitro marker but does not constitute clinical evidence. Human trials specifically testing green bell pepper extracts for inflammatory conditions are not documented in available peer-reviewed literature.

7.5 Immune Support (Vitamin C)

Vitamin C plays a crucial role in the human immune system, and bell peppers are packed with this essential nutrient. Studies consistently show that vitamin C status is associated with beneficial outcomes. Meta-analyses of human randomized controlled trials show that higher vitamin C intake (compared to sub-optimal intake) may potentially support immune function.

Evidence strength: The link between vitamin C and immune function is well-established in clinical research, but this evidence pertains to vitamin C generally — not to green bell pepper as a standalone intervention. Green bell pepper is a meaningful dietary source of vitamin C, providing approximately 80 mg per 100 g fresh weight.

7.6 Metabolic Effects (Antidiabetic and Antiobesity)

The lipid-lowering, antihypertensive, antidiabetic, and anti-obesity effects of C. annuum have been demonstrated in several studies. Evidence summarized in available reviews indicates that red pepper, together with its active ingredients capsinoids, displays enhanced benefits in promoting energy expenditure, including limiting energy intake, which is likely to reduce fat mass in overweight and obese individuals. However, most of the metabolic research pertains to pungent capsicum varieties containing capsaicin/capsinoids, not to bell peppers, which lack capsaicin.

Evidence strength: Metabolic and antidiabetic effects described in the literature are primarily attributable to capsaicin-containing capsicum, not to the non-pungent green bell pepper. For green bell pepper specifically, metabolic evidence is limited to in vitro and animal studies. Very limited information currently affirms the beneficial effects of pepper on individuals with metabolic syndrome in clinical settings.

7.7 Antimicrobial Activity

Hydroethanolic extracts of green bell pepper demonstrated strong antioxidant activity, with green bell pepper waste showing the highest levels. The extracts also exhibited antibacterial effects against Yersinia enterocolitica and Bacillus cereus, and antifungal activity against Aspergillus brasiliensis.

Evidence strength: Antimicrobial findings are from in vitro laboratory experiments using concentrated extracts. No human clinical trials on the antimicrobial application of green bell pepper have been identified in peer-reviewed sources.

8. Body Systems Associated with Green Bell Pepper

• Visual/Ocular System: Eating bell peppers regularly may support eye health by providing lutein and zeaxanthin, carotenoids that may help protect the retina from oxidative damage and reduce the risk of cataracts and macular degeneration.
• Immune System: Green bell peppers contain vitamin A, important for maintaining healthy skin, vision, and immune function.
• Nervous System: These peppers contain vitamin B6, which is involved in various metabolic processes in the body. It helps in the formation of neurotransmitters, red blood cells, and supports immune function.
• Digestive System: Green bell peppers contain dietary fiber, which supports digestive health. Fiber can help regulate bowel movements, prevent constipation, and contribute to a feeling of fullness.
• Cardiovascular System: Quercetin, luteolin, and vitamin C contribute indirectly via antioxidant and anti-inflammatory mechanisms.
• Musculoskeletal/Connective Tissue: Bell peppers may help to reduce the risk of developing some types of arthritis and other inflammatory health conditions, attributed to their beta-cryptoxanthin and high vitamin C content.

9. Nutritional Profile and Dosage Forms

9.1 Macronutrients and General Nutrition (per 100 g fresh weight)

Green bell peppers are low in calories (approximately 20 calories per 100 grams) and enriched with dietary fiber, vitamins, and antioxidants. They are particularly rich in vitamin C, providing over 80% of the recommended daily value per serving, along with small amounts of vitamin A, potassium, and folate. Green bell peppers contain 0.9 grams of protein per 100 grams. They provide 80 mg of vitamin C (approximately 89% DRI) per 100 grams, along with small amounts of vitamin A, vitamin K, and potassium.

One medium green bell pepper contains approximately 4.6 grams of carbohydrates, of which 1.4 grams are dietary fiber, resulting in a net carb content of around 3.2 grams.

9.2 Dosages from Scientific Studies

Specific clinical studies on isolated green bell pepper as a supplement have not established standardized supplemental dosages in published human trials. The dosages referenced in research pertain to specific bioactive constituents:

• Lutein (eye health, AREDS2 trial): Participants in AREDS2 who took 10 mg lutein and 2 mg zeaxanthin daily for a 5-year study period had a 10 to 25 percent reduced risk of AMD progression.
• Lutein (AMD risk reduction): AREDS2, a massive 6-year clinical trial funded by the U.S. NIH, used 10 mg of lutein and 2 mg of zeaxanthin; participants with the lowest dietary intake of these carotenoids reduced their chance of getting AMD by 26% and cataracts by 32% when supplemented at those doses.
• Lutein (dietary recommendation): Several studies suggest that eating at least 10 mg of lutein per day has the most beneficial effect on macular pigment levels. The average western diet is thought to contain no more than 3 mg of lutein and zeaxanthin per day.

10. Safety Considerations and Interactions

10.1 Allergy and Oral Allergy Syndrome

Bell peppers are generally healthy and well-tolerated, but some people may be allergic to them. An allergy to bell peppers and other nightshades is not common. Still, some people with an allergy to pollen, particularly mugwort pollen, may also be sensitive to bell peppers due to allergic cross-reactivity, or oral allergy syndrome.

Allergies to green peppers may indicate additional allergies to other capsicum plants such as cayenne, paprika, and jalapeños. Green peppers also belong to the nightshade family, and allergies to one member of the family can mean allergies to other members; nightshades include potatoes, tomatoes, eggplants, paprika, and cayenne pepper.

Some individuals may experience oral allergy syndrome (OAS), which is an allergy to certain raw fruits and vegetables. If this is the case, cooking green peppers typically eliminates these issues. In a published survey of OAS and anaphylaxis risk, green pepper was among the foods implicated in reactions in patients who had used epinephrine auto-injectors.

10.2 Nightshade Sensitivity

A nightshade allergy occurs when the body identifies certain compounds in nightshade plants as harmful, triggering an adverse immune response. This condition is considered rare but can significantly impact those affected, particularly individuals who have Inflammatory Bowel Disease (IBD) and Irritable Bowel Syndrome (IBS).

Some people who have functional digestive disorders with no known medical cause report that their symptoms become much worse after eating nightshades. These disorders include heartburn, bloating, and irritable bowel syndrome (IBS). However, there is no clear scientific evidence to support a link between nightshade foods and the worsening of these conditions.

10.3 Vitamin C Overconsumption

Too much vitamin C in the diet can lead to kidney stones. This caution applies to extremely high intakes, and dietary consumption from whole bell peppers at normal serving sizes is unlikely to reach toxic thresholds, which for ascorbic acid are well above typical dietary intake levels.

10.4 Pesticide Residues

Pesticide residues on non-organic skins warrant washing. A 2023 FDA report noted 95% of bell peppers test positive for residues, but peeling mitigates approximately 70% of exposure.

10.5 Pharmacological Interactions

Green bell pepper, as a non-capsaicin-containing food, does not carry the established drug interactions attributed to pungent capsicum (e.g., monoamine oxidase inhibitors, anticoagulants interacting with high-dose capsaicin preparations). The high vitamin C content is relevant to individuals taking iron supplements, as vitamin C significantly enhances non-heme iron absorption. Those managing conditions requiring carefully controlled iron intake should account for dietary vitamin C from high-consumption sources like bell pepper.

10.6 Latex-Fruit Syndrome

Latex-fruit syndrome: individuals allergic to latex may react to certain nightshades due to similar protein structures.

11. Evidence Summary and Limitations

Bell pepper fruits, seeds, and leaves contain bioactive compounds — phenols, flavonoids, carotenoids, tocopherol, and pectic polysaccharides — that in laboratory and preliminary studies exhibit antioxidant, antibacterial, antifungal, immunosuppressive and immunostimulant properties, and antidiabetic, antitumoral, and neuroprotective activities. However, further studies are required to guarantee the safety use of these compounds and to understand their mechanisms of action in human populations.

The most clinically supported health associations for green bell pepper as a whole food are its contributions of lutein (for ocular protection, supported by large-scale RCTs using isolated supplements) and vitamin C (for immune function and antioxidant status, supported by extensive human research). The antimicrobial, anti-inflammatory, and metabolic effects documented in vitro require confirmation in human clinical trials specific to green bell pepper consumption before therapeutic claims can be made.

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