Culturismo

DHA is a major structural fatty acid in the retina, accounting for approximately 20% of its weight, and is essential for normal visual function across the lifespan. Algal oil DHA supplementation in infant formula has been shown to improve visual acuity in formula-fed infants. DHA plays ongoing roles in retinal membrane function and protection from oxidative stress.

Alpha-carotene, like beta-carotene, is a provitamin A carotenoid convertible to retinol in the body. Higher serum alpha-carotene was epidemiologically associated with reduced cataract risk (OR 0.37, 95% CI 0.21–0.64) in a large NHANES-based study, and a 24–26-year prospective cohort of >100,000 adults found it among the carotenoids protective for eye health.

Two double-blind, placebo-controlled RCTs of 100 mg AGIQ/day for 8 weeks in Japanese cedar pollinosis subjects demonstrated significant improvement in ocular comfort and eye-related quality of life scores versus placebo. Flavonoids including quercetin also demonstrate mast cell-stabilizing effects in conjunctival tissue relevant to allergic eye disease.

Anchovies provide DHA, which is a major structural component of the retinal photoreceptor membrane, and vitamin A. Dietary omega-3 intake from oily fish including anchovies has been inversely associated with risk of vision-impairing conditions in epidemiological studies. DHA is considered critical for maintaining retinal function and photoreceptor integrity.

Norbixin from annatto has been studied in animal models of age-related macular degeneration (AMD), showing reduced A2E accumulation in the retina and protection of retinal pigment epithelium cells. In vitro, norbixin outperformed lutein and zeaxanthin in protecting retinal cells from blue-light phototoxicity. A norbixin drug candidate (BIO201) is under development for AMD clinical trials.

Apricots are a significant dietary source of beta-carotene (provitamin A), lutein, and zeaxanthin—compounds with well-established roles in supporting retinal and macular health. Beta-carotene is converted to vitamin A, which is essential for rod photoreceptor function and prevention of night blindness. Lutein and zeaxanthin accumulate in the macula and protect against age-related macular degeneration.

Astaxanthin is a ketocarotenoid produced by the microalga Haematococcus pluvialis with antioxidant potency far exceeding that of vitamin E or beta-carotene. Multiple Japanese RCTs found that 6 mg/day of astaxanthin improved visual acuity, reduced eye fatigue, and enhanced accommodative function in VDT workers. A 2022 PMC study found it reduces dry eye inflammation by suppressing HMGB1 and inflammatory cytokines.

Benfotiamine blocks all three major hyperglycemia-driven biochemical pathways implicated in retinal vascular damage and prevented experimental diabetic retinopathy in animal models. Small human studies and pilot trials suggest it may slow early diabetic retinopathy progression. No large-scale human RCT has confirmed these benefits for vision endpoints specifically.

Beta-carotene is a provitamin A carotenoid converted to vitamin A in the body, supporting retinal rhodopsin synthesis and helping prevent night blindness and dry eyes. The original AREDS trial included beta-carotene in its antioxidant formula, which reduced AMD progression by 25%. It has since been replaced in the updated AREDS2 formulation by lutein and zeaxanthin for most individuals.

Bilberry (Vaccinium myrtillus) is rich in anthocyanosides that enhance rhodopsin regeneration in retinal rod cells and support retinal microcirculation and antioxidant defense. A 2015 Japanese RCT (n=88) found 480 mg/day bilberry extract significantly reduced eye fatigue and improved visual accommodation in VDT workers. A 2017 RCT found standardized bilberry extract (Mirtoselect®) improved dry eye symptoms.

Black currant (Ribes nigrum) is rich in anthocyanins (delphinidin-3-rutinoside, cyanidin-3-glucoside) that relax ciliary smooth muscle, stimulate rhodopsin regeneration, and improve retinal blood circulation. A 2-year RCT found 50 mg/day black currant anthocyanins significantly reduced intraocular pressure in open-angle glaucoma patients. Studies also demonstrate improvements in dark adaptation and VDT-induced refractive shifts.

A large prospective cohort study (36,000+ women) investigated blueberry and anthocyanin intake in relation to cataract and age-related macular degeneration (AMD) risk. Preclinical and mechanistic evidence supports anthocyanins' role in retinal protection via antioxidant pathways.

Bovine liver is the richest food source of preformed vitamin A (retinol), which is required for rhodopsin synthesis in retinal rod cells, maintenance of the corneal epithelium, and overall photoreceptor function. Vitamin A deficiency causes night blindness, corneal damage, and xerophthalmia. Liver has been used to treat night blindness since antiquity, and the mechanism is now clinically validated.

Boxthorn is one of the most historically documented herbs for eye health in traditional Chinese medicine and is now supported by multiple clinical trials. LBPs protect retinal ganglion cells and pigment epithelium; zeaxanthin from boxthorn raises macular pigment optical density. Clinical trials in retinitis pigmentosa show preserved visual acuity and macular thickness with supplementation.

Brussels sprouts contain lutein, zeaxanthin, beta-carotene (provitamin A), and vitamin C — nutrients with established roles in retinal protection and age-related eye disease prevention. Lutein and zeaxanthin accumulate in the macula and protect against age-related macular degeneration (AMD) and cataract. Brussels sprouts are listed among foods high in lutein and zeaxanthin.

A small clinical study in patients with nonproliferative diabetic retinopathy (N=60) reported positive findings for R. aculeatus extract on microvascular retinopathy (Archimowicz-Cyrylowska 1996). A separate product study found no vision improvement in diabetic retinopathy patients. Evidence is preliminary, with only one supportive small trial.

DHA is a major structural component of the retina, and adequate DHA/EPA intake is linked to maintaining visual function and reducing risk of inflammatory eye conditions. Calamari oil is notably rich in DHA, the predominant omega-3 in retinal photoreceptors. Clinical and epidemiological evidence support a protective role of marine omega-3s for overall eye health.

Capsanthin, as a lipophilic xanthophyll carotenoid, has demonstrated antioxidant protection of ocular tissues, intraocular pressure reduction, and anti-inflammatory effects in preclinical models. Its light-absorbing and singlet oxygen quenching properties are relevant to retinal and corneal protection.

Beta-carotene serves as the principal dietary precursor of vitamin A (retinol), which is essential for maintaining the corneal epithelium, tear film integrity, and photoreceptor function. Deficiency leads to xerophthalmia, dry eye, and eventually blindness. Clinical guidelines have included beta-carotene in supplement formulas for populations at risk. Dietary beta-carotene intake is linked to slower AMD progression in peer-reviewed trials.

Carrots are rich in beta-carotene, which the body converts to vitamin A—essential for maintaining corneal integrity and overall eye function. Deficiency in vitamin A is a leading cause of preventable blindness worldwide. Clinical and epidemiological evidence supports dietary carotenoids from carrots in supporting broad eye health, though effects in well-nourished populations are modest.

Multiple clinical trials and a systematic review (2023) document citicoline's neuroprotective effects on retinal ganglion cells, visual evoked potentials, and visual field preservation in glaucoma patients. Both oral and topical (eyedrop) formulations have been studied in randomized controlled trials. A placebo-controlled crossover trial also found improved vision-related quality of life in glaucoma patients receiving oral citicoline.

Vitamin A in cod liver oil is essential for rhodopsin synthesis in photoreceptors, maintaining visual function. DHA is a major structural component of the retina. Both nutrients support overall eye health, with clinical evidence linking adequate intake to preservation of visual acuity and reduced risk of inflammatory eye conditions.

Forskolin from Coleus forskohlii has been studied in clinical trials as eye drops for open-angle glaucoma, demonstrating significant intraocular pressure (IOP) reduction. Topical 1% forskolin solution has shown efficacy greater than timolol in at least one comparative RCT. Oral and supplement formulations are also under investigation.

Collard greens are a leading dietary source of lutein and zeaxanthin (~14.6mg per cooked cup), carotenoids that concentrate in the macula and retina where they filter harmful blue light and act as antioxidants. Population studies link higher dietary lutein/zeaxanthin to reduced risk of cataracts and age-related retinal degeneration. The American Optometric Association recognizes these carotenoids for eye health benefits.

β-Cryptoxanthin is a provitamin A carotenoid with antioxidant and anti-inflammatory activity in retinal tissue. Animal studies demonstrate it protects against light-induced photoreceptor damage by reducing oxidative stress and mitochondrial DNA damage. As a provitamin A source, it contributes to retinol supply for visual cycle function.

Multiple human clinical studies support blackcurrant anthocyanins improving eye blood flow, reducing digital eye fatigue, improving dark adaptation, and supporting contrast sensitivity. A 2021 US double-blind RCT (n=61) found a 29.9% reduction in blurry vision symptoms with 445 mg blackcurrant extract daily for 10 weeks.

The eye is particularly susceptible to oxidative stress, and alpha-tocopherol has been included in major clinical trials for eye protection. The AREDS trial demonstrated that a combination including vitamin E significantly slowed progression of intermediate AMD, though vitamin E alone has not shown consistent benefit for preventing AMD or cataracts.

DHA is the predominant omega-3 fatty acid in photoreceptor outer segment membranes, comprising approximately 50–60% of total fatty acids in rod outer segments. It is essential for photoreceptor membrane fluidity, rhodopsin function, retinal development, and neuroprotection. Clinical evidence supports its role in dry eye disease management and retinal integrity.

DHA is the dominant structural fatty acid in the retina, essential for the function of photoreceptor rod cells. DHA deficiency impairs visual acuity and retinal function. DHA is rapidly accumulated in retinal tissue prenatally and in early postnatal life. Clinical evidence supports DHA supplementation for maintaining visual function in infants and potentially in age-related conditions.

EGCG protects retinal pigment epithelial cells from oxidative stress-induced death, slows photoreceptor degeneration in animal models of retinitis pigmentosa, and has demonstrated beneficial effects across multiple ocular pathologies including glaucoma, diabetic retinopathy, dry eye, and cataracts in preclinical studies. Human clinical evidence remains limited but mechanistic and animal data are substantial.

Egg yolks are a bioavailable dietary source of the carotenoids lutein and zeaxanthin, which accumulate exclusively in the retinal macula and protect photoreceptors from blue light and oxidative damage. Clinical trials show egg consumption raises serum lutein and zeaxanthin to levels comparable with supplement use.

EPA is an omega-3 fatty acid with potent anti-inflammatory properties via synthesis of pro-resolving mediators (resolvins, protectins). It supports retinal vascular health and is a component of the AREDS2 omega-3 arm studied for AMD and dry eye. Meta-analyses of RCTs show EPA-containing omega-3 supplementation significantly reduces dry eye disease symptoms.

DHA is a major structural component of the retinal photoreceptor cell membrane, and adequate omega-3 status is essential for optimal visual development and retinal function. Fish oil supplementation supports eye health through anti-inflammatory EPA/DHA pathways and retinal DHA incorporation. Observational and mechanistic evidence supports fish oil's role in general retinal and ocular surface health.

Forskolin eye drops lower intraocular pressure by reducing aqueous humor production, providing neuroprotection to retinal ganglion cells. Multiple clinical trials, including a double-blind RCT in open-angle glaucoma patients, confirm IOP-reducing efficacy.

Ginkgo biloba extract (GBE) contains flavonoids and terpenoids with antioxidant and vasoactive properties that improve retinal and optic nerve blood flow. A Korean RCT (n=30, normal tension glaucoma) found 80 mg GBE twice daily significantly improved retinal blood flow vs. placebo. Small clinical trials also showed modest improvements in AMD-related vision and glaucoma-associated visual field damage.

Goji berry (Lycium barbarum) contains zeaxanthin dipalmitate as the predominant macular carotenoid, along with polysaccharides with neuroprotective effects on retinal ganglion cells. It has been used in Traditional Chinese Medicine for millennia to 'brighten the eyes.' A 2011 RCT found Lycium barbarum polysaccharides protected against AMD-related hypopigmentation and drusen accumulation in elderly subjects.

Human and preclinical evidence supports a protective role for grape seed proanthocyanidins in the retinal vasculature. One clinical trial in diabetic retinopathy found 150 mg/day GSE reduced ocular fluid leakage versus placebo and standard drug, though it did not significantly affect disease progression. Preclinical studies show grape-derived polyphenols protect retinal pigment epithelium (RPE) cells from oxidative senescence.

GSE has been used for diabetic retinopathy, macular degeneration, and general eye health. A clinical study showed grape seed proanthocyanidins improved hard exudates in non-proliferative diabetic retinopathy. OPCs strengthen retinal capillaries, reduce oxidative stress in the retina, and modulate retinal pigment epithelium (RPE) cellular senescence.

Huckleberry shares its core anthocyanoside phytochemistry with bilberry (Vaccinium myrtillus), for which clinical and preclinical evidence supports protection of retinal tissue, reduced oxidative damage to the eye, and reduced retinal vascular permeability. Huckleberry's anthocyanins support collagen synthesis in capillaries supplying the eye and scavenge free radicals in retinal cells. The genus-level clinical evidence for eye health is among the strongest for any Vaccinium application.

Kale provides lutein, zeaxanthin, beta-carotene (provitamin A), vitamin C, and vitamin E—all nutrients with established roles in ocular health. Lutein and zeaxanthin protect retinal photoreceptors from oxidative and phototoxic damage. Vitamin A deficiency is a leading cause of preventable blindness, and kale's beta-carotene supports vitamin A status.

Lutein is a xanthophyll carotenoid that selectively accumulates in the human macula and retina, where it protects against blue-light damage and oxidative stress. The landmark AREDS2 trial (NIH; n=4,203) showed 10 mg/day lutein with 2 mg zeaxanthin reduced risk of advanced AMD progression. A 2021 systematic review and meta-analysis found daily doses of 5–20 mg raised macular pigment optical density by 0.04 units in healthy adults.

Lycopene is a carotenoid with potent antioxidant properties whose higher serum levels have been epidemiologically associated with reduced AMD risk. A 2025 population-based cross-sectional study (NHANES; n=>1000) found the highest serum lycopene quartile was inversely associated with AMD risk (OR 0.37, 95% CI 0.18–0.78).

Mango provides beta-carotene (converted to vitamin A), lutein, and zeaxanthin — nutrients with well-documented roles in retinal health. Beta-carotene supports visual pigment synthesis and corneal integrity, while lutein and zeaxanthin concentrate in the macula, filtering blue light and protecting against age-related macular degeneration (AMD).

Beyond dry eyes, maqui delphinidins protect retinal photoreceptor cells from light-induced oxidative damage in cell and animal models. A 2024 BMC study demonstrated that maqui delphinidins protect photoreceptor mitochondria from blue light-induced damage. Anthocyanins in maqui also support rhodopsin resynthesis and exert neuroprotective effects on retinal ganglion cells.

MeCbl deficiency, particularly in the context of inborn errors of cobalamin metabolism, is associated with significant retinal degeneration, macular atrophy, and visual loss. Cobalamin therapy (including MeCbl-related pathways) is used to manage ocular features of cblC disease. Optic neuropathy is also a recognized manifestation of B12 deficiency.

Mulberry leaf is used in TCM specifically to treat red, dry, and irritated eyes. Modern research shows mulberry anthocyanins protect retinal cells from glucose-induced oxidative injury via Nrf2 activation—relevant to diabetic retinopathy. Cell culture evidence is available; human clinical eye-outcome trials are lacking.

Omega-3 fatty acids (primarily DHA and EPA) are well-established as essential for retinal structure and function, with DHA comprising ~50–60% of rod outer segment phospholipids. Systematic reviews and meta-analyses of multiple RCTs confirm significant benefits for dry eye disease, and epidemiological evidence supports a protective role in AMD prevention.

Vitamin A palmitate supports multiple facets of ocular health, including retinal photoreceptor maintenance, corneal integrity, and prevention of xerophthalmia. Clinical trials have documented benefits in retinitis pigmentosa and macular degeneration-related dark adaptation deficits.

Beyond dry eyes, panthenol has been studied for corneal epithelial healing after ocular surgery. A published study (Hamdi, J. Ophthalmol., 2018) examined D-panthenol's effect on corneal epithelial healing after surface laser ablation, supporting a role in post-procedural ocular tissue repair. Dexpanthenol's regenerative and anti-inflammatory properties extend to ocular surface health.

Parsley is a notable dietary source of lutein, zeaxanthin, and beta-carotene—carotenoids with established roles in protecting retinal tissue from oxidative damage and reducing the risk of age-related macular degeneration (AMD) and cataracts. Vitamin A from parsley's beta-carotene further supports visual function.

Clinical trials show Pycnogenol (pine bark extract) improves retinal microcirculation and reduces vascular leakage in early diabetic retinopathy. It also strengthens retinal capillaries and is used in eye health studies. Documented in a systematic review of 39 RDP trials as a positive clinical indication.

Pine bark extract (Pycnogenol®, from Pinus pinaster) contains oligomeric proanthocyanidins with potent antioxidant and vascular-protective effects in the retina. Small clinical studies have shown it reduces retinal leakage and improves visual acuity in early diabetic retinopathy and reduces intraocular pressure when combined with bilberry. It protects retinal cells from oxidative damage.

P. marsupium demonstrates anti-cataract activity in preclinical models. A PubMed-indexed study showed its aqueous bark extract delayed diabetic cataract formation in alloxan-diabetic rats, alongside blood glucose reduction.

Pumpkin is among the richest food sources of beta-carotene, the provitamin A carotenoid essential for retinal function and prevention of night blindness. It also provides lutein and zeaxanthin, carotenoids specifically concentrated in the macula that protect against age-related macular degeneration and cataract. Epidemiological cohort data support these associations.

Saffron (Crocus sativus L.) contains the carotenoids crocin and crocetin, which have demonstrated cytoprotective, antioxidant, and anti-inflammatory effects on retinal cells. Multiple clinical trials found daily supplementation with 20–50 mg saffron for 3–12 months significantly improved best-corrected visual acuity, contrast sensitivity, and retinal function in AMD patients, as measured by ERG and microperimetry.

Spinach is one of the richest dietary sources of lutein and zeaxanthin, which accumulate in the retina as macular pigment. Higher dietary intake of these carotenoids is associated in cohort studies with lower AMD risk, and supplementation improves macular pigment optical density in clinical trials.

Taurine is one of the most abundant amino acids in the retina, particularly in rod and cone photoreceptors, where it is essential for photoreceptor survival and antioxidant defense. Animal studies show taurine deficiency causes photoreceptor degeneration; clinical evidence links low taurine levels to macular degeneration, and a clinical study reported improved retinitis pigmentosa vision with taurine supplementation.

Triphala has a documented role in ocular health through both traditional use and clinical research. A clinical study using Triphala eye drops in 141 patients with computer vision syndrome showed marked improvement in eye symptoms. Its antioxidant properties show anti-cataract effects in animal models.

Vitamin A (retinol) is essential for the synthesis of rhodopsin in retinal rod cells, enabling vision in low-light conditions. Deficiency causes night blindness, xerophthalmia, and ultimately blindness; supplementation reverses these effects. It is classified by WHO as the leading preventable cause of childhood blindness when deficient.

Riboflavin deficiency is associated with corneal vascularization and elevated cataract risk. AREDS data showed an inverse association between dietary B2 intake and cataract risk. One observational study found a 31–51% lower risk of cataracts with higher riboflavin intake. The FDA has approved an ophthalmic riboflavin formulation for corneal cross-linking in keratoconus.

Vitamin C (ascorbic acid) is a water-soluble antioxidant present in high concentrations in the aqueous humor and lens of the eye, where it protects against UV-induced oxidative damage. It was a core component of the AREDS antioxidant formula (500 mg/day) that reduced AMD progression risk by 25%. Epidemiological data link higher vitamin C intake to reduced cataract risk.

Vitamin E (primarily alpha-tocopherol) is a fat-soluble antioxidant that protects retinal cell membranes from lipid peroxidation and oxidative damage by free radicals. At 400 IU/day, it was included in the AREDS antioxidant formula associated with a 25% reduction in AMD progression. Epidemiological evidence also links higher vitamin E intake to reduced cataract risk.

Watercress is a recognized dietary source of lutein and zeaxanthin, two carotenoids that accumulate in the macula and retina. The Gill et al. (2007) RCT demonstrated a 100% increase in plasma lutein after 8 weeks of watercress consumption. Lutein and zeaxanthin are strongly supported by clinical trial evidence, including AREDS2, for protecting eye health.

Watermelon's lycopene and vitamins A and C are associated with reduced risk of age-related macular degeneration (AMD) and cataracts. Lycopene deficiency correlates with AMD risk in population studies, and in vitro evidence shows lycopene reduces inflammatory damage to retinal cells.

Zeaxanthin is a xanthophyll carotenoid that, along with lutein, constitutes the macular pigment of the human eye and is selectively concentrated in the foveal region. Multiple RCTs and the AREDS2 trial support its role in reducing AMD progression and protecting against blue-light phototoxicity. Epidemiological and clinical evidence links higher serum zeaxanthin to reduced cataract and AMD risk.

Zinc is a trace mineral essential for retinal function, serving as a cofactor for antioxidant enzymes (superoxide dismutase) and retinol-binding protein, facilitating vitamin A transport to the retina. In the original AREDS trial (n=3,640), high-dose zinc (80 mg/day) combined with antioxidants reduced AMD progression risk by 25%. Zinc is a core component of the recommended AREDS and AREDS2 supplementation formulas.

Belleric myrobalan has deep traditional roots as an ocular remedy in Ayurveda. Classical Ayurvedic formulations including Triphala Ghrita (containing T. bellirica) have been used for myopia, hypermetropia, and other eye disorders. Topical application of fruit paste or lotion to the eye region is recorded in classical texts, and seed oil is described as beneficial for eye disorders. RxList and Ayurvedic pharmacopeia sources document its use as a lotion for sore eyes.

Chrysanthemum (Chrysanthemum morifolium) has been used in Traditional Chinese Medicine for thousands of years to 'clear liver fire' and 'brighten the eyes,' treating eye fatigue, redness, and blurred vision. A 2020 RCT (AJCN) found a botanical formula incorporating chrysanthemum, goji, and black currant with lutein/zeaxanthin reduced eye fatigue and dry eye in a double-blind, placebo-controlled study.

Improving vision is one of the classic traditional indications of dodder seed in TCM, mentioned in the Shennong Bencao Jing and subsequent pharmacopeias. TCM theory holds that the liver 'opens to the eyes' and kidney-liver tonification supports vision. Dodder is used for eye dryness, fatigue, and decreased vision. No human clinical trials specifically for vision outcomes have been published.

Dulse contains vitamin A (as beta-carotene), lutein, zeaxanthin, and vitamin C—micronutrients nutritionally associated with maintenance of retinal and ocular health. Its vitamin A content is notable: approximately 40% of the daily recommended intake in just 7 g of dulse. Traditional and nutritional use links dulse to eye health via these nutrient contributions.

Eyebright (Euphrasia officinalis) has a centuries-long tradition of use in European herbal medicine for eye irritation, conjunctivitis, and eye fatigue. It contains flavonoids (aucubin, quercetin derivatives) and vitamin A precursors with anti-inflammatory and antioxidant properties. A 2014 in vitro study found eyebright extract supported corneal cell health and reduced inflammation.

Improving vision and treating eye disorders is the primary traditional use of Shi Jue Ming documented since the third and fourth centuries CE. TCM records consistently cite it for blurred vision, red eyes, and general visual deterioration attributed to Liver Heat or Yang rising.

In TCM, Morus alba leaves (Sang Ye) are a classical remedy for red, irritated, or dry eyes, and are used for conditions associated with Liver heat. Traditional texts describe mulberry leaf as entering the Liver channel to clear heat and improve vision. Modern research has not yet produced clinical RCTs specifically on eye endpoints.

Ligustrum lucidum has a documented TCM tradition of over 1,000 years for improving vision, treating blurred vision, dry eyes, and diminished eyesight. Some preclinical evidence suggests the compound specnuezhenide inhibits retinal angiogenesis via HIF-1alpha/VEGF signaling. No human trials exist.