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VisionEssence

Pure Essence
4.5
★ ★ ★ ★ ★
(88 ratings)
Taurine 400 mg
Carnosine 50 mg
Astaxanthin 4 mg
Product Image
Score66
Well-dosed lutein and zeaxanthin anchor a broad eye-antioxidant formula. Most secondary ingredients are modest, and absorption detail is incomplete.
How scoring works
Quantity:60 Vegi-Cap(s) • (30 servings)
Goals:
Vision Support

Score 66

Well-dosed lutein and zeaxanthin anchor a broad eye-antioxidant formula. Most secondary ingredients are modest, and absorption detail is incomplete.
How scoring works
$32.79($1.09 per serving)
iHerb
$ 32.79
Vitacost
$ 43.48
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Analysis

Lutein at 20 mg and zeaxanthin at 4 mg provide the clearest eye-focused core, with 4 mg astaxanthin adding antioxidant support. Taurine at 400 mg and vitamin C broaden retinal and oxidative pathways.

Black currant, goji, schizandra, quercetin, red sage, carnosine, and alpha-lipoic acid create broad coverage. Many appear at modest amounts, making the formula stronger for vision than for cognitive, cardiovascular, or anti-aging use.

The two-capsule serving itemizes all active amounts and uses branded XanMax carotenoids. A dry capsule, generic astaxanthin, and absent inactive-ingredient and purity details limit absorption and quality assessment.

Who is it for
  • Adults seeking broad vision support
  • People wanting lutein with zeaxanthin and astaxanthin
  • Users comfortable with a multi-antioxidant blend
Best for
  • Macular carotenoid support
  • Vision-focused antioxidant routines
  • General retinal nutrition

Pros

  • Provides 20 mg lutein
  • Includes 4 mg zeaxanthin
  • Adds 4 mg astaxanthin
  • Fully discloses active amounts

Cons

  • Carnosine and alpha-lipoic acid are lightly dosed
  • Taurine is below a focused amount
  • Astaxanthin source is not identified
  • Dry capsule lacks clear lipid absorption support

Warnings

  • Red sage and quercetin may add to bleeding risk with anticoagulant medicines
  • Schizandra can alter medication metabolism
  • Carotenoids can cause harmless skin color changes at high cumulative intake

Nutrient quality

82 Highest impact

Named marigold carotenoids and sourced quercetin support quality, while several botanicals and astaxanthin lack source detail. Lutein, zeaxanthin, and taurine are useful, while carnosine and several secondary antioxidants are modest.

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Ingredient transparency

68 High impact

Active amounts are stated and no proprietary blend hides a core dose. Missing excipient details and complete use directions leave the supplied label information incomplete.

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Customer satisfaction

58 Moderate impact

The supplied aggregate satisfaction average provides a broad signal, while the response volume determines how stable it appears. No comment-level evidence is available to assess repeated complaints or confirm intended-use experiences.

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Value for money

53 Moderate impact

Quality, safety trade-offs, or serving economics materially weaken value. Numerous small antioxidants broaden coverage but may dilute practical depth.

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Report analysis

Goals

Vision Support
Impact
High effect
A- Goal FitC Strength of SupportB CoverageB Formula Quality
Vitamin C · 100 mgAstaxanthin · 4 mg

Taurine and Astaxanthin provide a clear foundation for vision support. The supplied amounts do not establish strong targeted support.

Coverage spans macular filtering, retinal structure, and oxidative defense. Some pathways remain less complete than the formula’s strongest area.

Study evidence
Astaxanthin Mixed 7 studies
Taurine Supportive 1 study
Skin Health
Impact
Moderate effect
C+ Goal FitB- Strength of SupportD+ CoverageD+ Formula Quality
Vitamin C · 100 mgAstaxanthin · 4 mg

Astaxanthin at 4 mg offers a credible oral photoprotection and antioxidant pathway for skin. Lutein, zeaxanthin, vitamin C, and plant antioxidants broaden defense, although the formula is designed for vision.

No collagen, ceramide, or hydration active is present. Clearly disclosed carotenoid amounts support assessment, while many eye-focused ingredients reduce skin specificity.

Study evidence
Astaxanthin Supportive 12 studies
Vitamin C Supportive 53 studies
Anti-Inflammatory Support
Impact
Moderate effect
C+ Goal FitD+ Strength of SupportC CoverageC Formula Quality
Taurine · 400 mgAstaxanthin · 4 mgVitamin C · 100 mg

Astaxanthin, quercetin, black currant, goji, and alpha-lipoic acid create broad antioxidant coverage with some inflammatory relevance. Most supporting actives are modestly dosed and the product is designed for eye health.

The astaxanthin amount is credible, while the remaining pathways offer limited depth. A large but thematically consistent antioxidant blend is coherent, though it includes some duplication.

Study evidence
Astaxanthin Supportive 18 studies
Taurine Supportive 12 studies
Anti-Aging
Impact
Moderate effect
C+ Goal FitD Strength of SupportC CoverageC- Formula Quality
Astaxanthin · 4 mgTaurine · 400 mgCarnosine · 50 mg

Astaxanthin supports antioxidant protection, while carnosine and taurine add anti-glycation and cellular-support concepts. The eye-focused blend has relevant breadth, but two of those longevity actives are substantially underdosed.

Astaxanthin reaches a practical amount, while the dry capsule lacks clear sourcing and absorption support. The small carnosine and taurine amounts limit systemic healthy-aging value.

Study evidence
Astaxanthin Supportive 4 studies
Carnosine Supportive 6 studies
Taurine Supportive 3 studies
Cardiovascular Support
Impact
Moderate effect
C- Goal FitD+ Strength of SupportC CoverageC Formula Quality
Astaxanthin · 4 mgTaurine · 400 mgVitamin C · 100 mg

Taurine, astaxanthin, grape-derived antioxidants, and red sage offer plausible vascular and oxidative support. The formula is designed mainly for eye health, so cardiovascular relevance is secondary.

Several antioxidant pathways are represented, but most actives are modest for systemic heart support and source details are uneven. Taurine remains below a strong targeted amount, while the many eye-focused carotenoids add little cardiovascular depth.

Study evidence
Astaxanthin Supportive 12 studies
Taurine Supportive 24 studies

Ingredients

IngredientAmount per serving
Vitamin C (Ascorbic Acid)
100 mg
L-Taurine
400 mg
Black Currant fruit extract
100 mg
organic Goji
100 mg
Schizandra extract
100 mg
L-Carnosine
50 mg
Quercetin (Japanese Sophora bud extract)
50 mg
Red Sage extract
50 mg
Alpha Lipoic Acid
25 mg
Lutein (Marigold extract, XanMax)
20 mg
Astaxanthin
4 mg
Zeaxanthin (Marigold extract, XanMax)
4 mg
Gluten Free Adults 18–50 Vegan Dairy Free Vegetarian
Report overview
Taurine · 400 mg OverallScore50
B- Active Ingredient Quality & BioavailabilityD- Dose, Safety & Label TransparencyF Value

The L-Taurine name improves form clarity, but the amount remains below the general-maintenance tier. Source details and independent verification are absent, and the amount is stated only for a two-capsule serving. A broad eye-support blend drives the formula and results in weak taurine-specific value.

Carnosine · 50 mg OverallScore49
A Active Ingredient Quality & BioavailabilityF Dose, Safety & Label TransparencyF Value

Explicit L-carnosine labeling confirms the preferred isomer, but the 50 mg amount is far too small for systemic anti-glycation use. The two-capsule formula focuses mainly on eye-support antioxidants rather than carnosine. High normalized cost and incomplete excipient disclosure make it a weak carnosine choice.

Astaxanthin · 4 mg OverallScore45
F Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyF Value

A clinically aligned astaxanthin amount adds antioxidant breadth to a large eye-support blend. Generic sourcing and a dry capsule leave the ingredient origin, isomer profile, and absorption support uncertain. The high active cost and absent packaging details make it a weak choice for targeted astaxanthin value.

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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Astaxanthin (AstaReal®) Improved Acute and Chronic Digital Eye Strain in Children: A Randomized Double-Blind Placebo-Controlled Trial.
    Hecht KA; Marwah M; Wood V; Nishida Y; Bach AE; Gerson J; Hom MM; Schnackenberg J; Raote S; Srivastava S; Negi P; Caston E · Advances in therapy · 2025
    Randomized trial64 participantsVision Support forAstaxanthin
  2. Multinuclear MRS at 7T Uncovers Exercise Driven Differences in Skeletal Muscle Energy Metabolism Between Young and Seniors.
    Krumpolec P; Klepochová R; Just I; Tušek Jelenc M; Frollo I; Ukropec J; Ukropcová B; Trattnig S; Krššák M; Valkovič L · Frontiers in physiology · 2021
    Cross-sectional studyAnti-Aging forCarnosine
  3. Nutritional Strategies Targeting Glucose Metabolism to Slow Cognitive Aging: A Scoping Review of Human Trials.
    Fernando MG; Sullivan K; Simons M; Squillace A; Kiat H; Martins RN · The American journal of clinical nutrition · 2026
    Scoping review32 studies pooledAnti-Aging forCarnosine
  4. Sports and Kinetic Visual Acuity.
    Sawaki K; Kohmura Y; Aoki K; Nakamura M; Murakami S; Suzuki Y · Juntendo Iji zasshi = Juntendo medical journal · 2024
    Narrative reviewVision Support forAstaxanthin
  5. Effects of diet containing astaxanthin on visual function in healthy individuals: a randomized, double-blind, placebo-controlled, parallel study.
    Sekikawa T; Kizawa Y; Li Y; Miura N · Journal of clinical biochemistry and nutrition · 2023
    Randomized trial60 participantsVision Support forAstaxanthin
  6. Anserine/Carnosine Supplementation Preserves Blood Flow in the Prefrontal Brain of Elderly People Carrying APOE e4.
    Ding Q; Tanigawa K; Kaneko J; Totsuka M; Katakura Y; Imabayashi E; Matsuda H; Hisatsune T · Aging and disease · 2020
    Randomized trial68 participantsAnti-Aging forCarnosine
  7. Skin beautification with oral non-hydrolized versions of carnosine and carcinine: Effective therapeutic management and cosmetic skincare solutions against oxidative glycation and free-radical production as a causal mechanism of diabetic complications and skin aging.
    Babizhayev MA; Deyev AI; Savel'yeva EL; Lankin VZ; Yegorov YE · The Journal of dermatological treatment · 2013
    Randomized trial42 participantsAnti-Aging forCarnosine
  8. Benefits and Safety of Astaxanthin in the Treatment of Mild-To-Moderate Dry Eye Disease.
    Tian L; Wen Y; Li S; Zhang P; Wang Y; Wang J; Cao K; Du L; Wang N; Jie Y · Frontiers in nutrition · 2022
    Single-arm trial60 participantsVision Support forAstaxanthin
  9. Nutritional Supplementation for Myopia Prevention and Control: A Systematic Review of Randomized Controlled Trials.
    Martinez-Perez C; Oliveira AP · Nutrients · 2026
    Systematic review9 studies pooledVision Support forAstaxanthin
  10. Telomere Attrition in Human Lens Epithelial Cells Associated with Oxidative Stress Provide a New Therapeutic Target for the Treatment, Dissolving and Prevention of Cataract with N-Acetylcarnosine Lubricant Eye Drops. Kinetic, Pharmacological and Activity-Dependent Separation of Therapeutic Targeting: Transcorneal Penetration and Delivery of L-Carnosine in the Aqueous Humor and Hormone-Like Hypothalamic Antiaging Effects of the Instilled Ophthalmic Drug Through a Safe Eye Medication Technique.
    Babizhayev MA; Yegorov YE · Recent patents on drug delivery & formulation · 2017
    Narrative reviewAnti-Aging forCarnosine
  11. Astaxanthin, cell membrane nutrient with diverse clinical benefits and anti-aging potential.
    Kidd P · Alternative medicine review : a journal of clinical therapeutic · 2012
    Narrative reviewVision Support Anti-Aging forAstaxanthin
  12. Markers of Hypoxia and Oxidative Stress in Aging Volunteers Ingesting Lycosomal Formulation of Dark Chocolate Containing Astaxanthin.
    Petyaev IM; Klochkov VA; Chalyk NE; Pristensky DV; Chernyshova MP; Kyle NH; Bashmakov YK · The journal of nutrition, health & aging · 2019
    Randomized trial32 participantsAnti-Aging forAstaxanthin
  13. The effectiveness of a standardized rose hip powder, containing seeds and shells of Rosa canina, on cell longevity, skin wrinkles, moisture, and elasticity.
    Phetcharat L; Wongsuphasawat K; Winther K · Clinical interventions in aging · 2016
    Randomized trial34 participantsAnti-Aging Skin Health forAstaxanthin
  14. Systematic Review and Meta-Analysis on the Effects of Astaxanthin on Human Skin Ageing.
    Zhou X; Cao Q; Orfila C; Zhao J; Zhang L · Nutrients · 2021
    Meta-analysis11 studies pooledAnti-Aging forAstaxanthin
  15. Taurine supplementation reduces myeloperoxidase and matrix-metalloproteinase-9 levels and improves the effects of exercise in cognition and physical fitness in older women.
    Chupel MU; Minuzzi LG; Furtado GE; Santos ML; Ferreira JP; Filaire E; Teixeira AM · Amino acids · 2021
    Randomized trial48 participantsAnti-Aging forTaurine
  16. Taurine as a possible antiaging therapy: A controlled clinical trial on taurine antioxidant activity in women ages 55 to 70.
    Abud GF; De Carvalho FG; Batitucci G; Travieso SG; Bueno Junior CR; Barbosa Junior F; Marchini JS; de Freitas EC · Nutrition (Burbank, Los Angeles County, Calif.) · 2022
    Randomized trial24 participantsAnti-Aging forTaurine
  17. Association of taurine intake with changes in physical fitness among community-dwelling middle-aged and older Japanese adults: an 8-year longitudinal study.
    Domoto T; Kise K; Oyama Y; Furuya K; Kato Y; Nishita Y; Kozakai R; Otsuka R · Frontiers in nutrition · 2024
    Cohort studyAnti-Aging forTaurine
  18. The anti-inflammatory and antioxidant effects of astaxanthin as an adjunctive therapy in community-acquired pneumonia: a randomized controlled trial.
    Youssef FM; Ateyya H; Hanna Samy AE; Elmokadem EM · Frontiers in pharmacology · 2025
    Randomized trial80 participantsAnti-Inflammatory Support forAstaxanthin
  19. The Role of Astaxanthin as an Antioxidant and Anti-Inflammatory Agent in Human Health: A Systematic Review.
    Malcangi G; Inchingolo AM; Casamassima L; Trilli I; Ferrante L; Longo M; Inchingolo F; Marinelli G; Palermo A; Dipalma G; Inchingolo AD · International journal of molecular sciences · 2026
    Systematic review15 studies pooledAnti-Inflammatory Support forAstaxanthin
  20. Astaxanthin ameliorates inflammation, oxidative stress, and reproductive outcomes in endometriosis patients undergoing assisted reproduction: A randomized, triple-blind placebo-controlled clinical trial.
    Rostami S; Alyasin A; Saedi M; Nekoonam S; Khodarahmian M; Moeini A; Amidi F · Frontiers in endocrinology · 2023
    Randomized trial50 participantsAnti-Inflammatory Support forAstaxanthin
  21. Astaxanthin Modulates Inflammation in Type 2 Diabetes via Regulation of microRNAs, Lysophosphatidylcholine, and α-Hydroxybutyrate.
    Sharifi-Rigi A; Zal F; Aarabi MH; Dehghani M; Roustaei Rad N; Taghiyar S · International journal of endocrinology · 2025
    Randomized trial50 participantsAnti-Inflammatory Support forAstaxanthin
  22. Redox-sensitive miRNAs and Humanin could mediate effects of exercise and astaxanthin on oxidative stress and inflammation in type 2 diabetes.
    Basereh A; Khoramipour K; Hosseini N; HajHosseini M; Khodabakhshi A; Amirkhosravi L; Khoramipour K · Scientific reports · 2025
    Randomized trial90 participantsAnti-Inflammatory Support forAstaxanthin
  23. Oxidative stress and inflammation in obesity after taurine supplementation: a double-blind, placebo-controlled study.
    Rosa FT; Freitas EC; Deminice R; Jordão AA; Marchini JS · European journal of nutrition · 2015
    Randomized trial24 participantsAnti-Inflammatory Support forTaurine
  24. Effect of taurine supplementation on preventing ventilator-associated pneumonia in pediatrics under mechanical ventilation, a randomized controlled double-blind clinical trial.
    Shirzad-Yazdi N; Shorafa E; Abootalebi SN; Heidari R; Hojabri K; Doostfatemeh M; Masjedi F; Vazin A; Shafiekhani M · Frontiers in pediatrics · 2025
    Randomized trial77 participantsAnti-Inflammatory Support forTaurine
  25. Effect of taurine in muscle damage markers and inflammatory cytokines in running exercise.
    Wang Y; Xu T; Zhao H; Gu C; Li Z · Frontiers in physiology · 2022
    Non-randomized trial10 participantsAnti-Inflammatory Support forTaurine
  26. Exercise and taurine in inflammation, cognition, and peripheral markers of blood-brain barrier integrity in older women.
    Chupel MU; Minuzzi LG; Furtado G; Santos ML; Hogervorst E; Filaire E; Teixeira AM · Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2018
    Randomized trial48 participantsAnti-Inflammatory Support forTaurine
  27. Taurine supplementation has anti-atherogenic and anti-inflammatory effects before and after incremental exercise in heart failure.
    Ahmadian M; Roshan VD; Aslani E; Stannard SR · Therapeutic advances in cardiovascular disease · 2017
    Randomized trialAnti-Inflammatory Support forTaurine
  28. Astaxanthin, a natural antioxidant, lowers cholesterol and markers of cardiovascular risk in individuals with prediabetes and dyslipidaemia.
    Ciaraldi TP; Boeder SC; Mudaliar SR; Giovannetti ER; Henry RR; Pettus JH · Diabetes, obesity & metabolism · 2023
    Randomized trial34 participantsCardiovascular Support forAstaxanthin
  29. Antioxidant Lipid Supplement on Cardiovascular Risk Factors: A Systematic Review and Meta-Analysis.
    Wan S; Wu W; Zhang Y; He J; Wang X; An P; Luo J; Zhu Y; Luo Y · Nutrients · 2024
    Meta-analysisCardiovascular Support forAstaxanthin
  30. Administration of natural astaxanthin increases serum HDL-cholesterol and adiponectin in subjects with mild hyperlipidemia.
    Yoshida H; Yanai H; Ito K; Tomono Y; Koikeda T; Tsukahara H; Tada N · Atherosclerosis · 2010
    Randomized trial61 participantsCardiovascular Support forAstaxanthin
  31. Effects of Astaxanthin Supplementation on Glycemic Control and Lipid Profile in Patients With Prediabetes and Type 2 Diabetes: A Meta-Analysis of Randomized Controlled Trials.
    Molani-Gol R; Bohlouli Sardroudi S; Rafraf M · Nutrition and metabolic insights · 2026
    Meta-analysis403 participants9 studies pooledCardiovascular Support forAstaxanthin
  32. Astaxanthin Supplemented with High-Intensity Functional Training Decreases Adipokines Levels and Cardiovascular Risk Factors in Men with Obesity.
    Saeidi A; Nouri-Habashi A; Razi O; Ataeinosrat A; Rahmani H; Mollabashi SS; Bagherzadeh-Rahmani B; Aghdam SM; Khalajzadeh L; Al Kiyumi MH; Hackney AC; Laher I; Heinrich KM; Zouhal H · Nutrients · 2023
    Randomized trial68 participantsCardiovascular Support forAstaxanthin
  33. Taurine Supplementation Lowers Blood Pressure and Improves Vascular Function in Prehypertension: Randomized, Double-Blind, Placebo-Controlled Study.
    Sun Q; Wang B; Li Y; Sun F; Li P; Xia W; Zhou X; Li Q; Wang X; Chen J; Zeng X; Zhao Z; He H; Liu D; Zhu Z · Hypertension (Dallas, Tex. : 1979) · 2016
    Randomized trial120 participantsCardiovascular Support forTaurine
  34. Taurine ameliorates blood pressure and vascular function in patients with type 2 diabetes: Randomized, double-blind, placebo-controlled trial.
    Li Y; Wang Q; Liu Y; Li Q; Xia W; Lin S; Yang Q; Scholze A; Zhao Z; He H; Zhang H; Yan Z; Tepel M; Mu H; Zhu Z; Liu D · iScience · 2025
    Randomized trial165 participantsCardiovascular Support forTaurine
  35. Taurine reduces the risk for metabolic syndrome: a systematic review and meta-analysis of randomized controlled trials.
    Tzang CC; Chi LY; Lin LH; Lin TY; Chang KV; Wu WT; Özçakar L · Nutrition & diabetes · 2024
    Meta-analysis1,024 participants25 studies pooledCardiovascular Support forTaurine
  36. Effects of Oral Taurine Supplementation on Cardiometabolic Risk Factors: A Meta-analysis and Systematic Review of Randomized Clinical Trials.
    Nie Z; Liu Y; Zhang M; Wu C; Cao Q; Xu J; Zheng Y; Min Z; Zhang W; Han S · Nutrition reviews · 2025
    Meta-analysis34 studies pooledCardiovascular Support forTaurine
  37. The effects of taurine supplementation on glycemic control and serum lipid profile in patients with type 2 diabetes: a randomized, double-blind, placebo-controlled trial.
    Maleki V; Alizadeh M; Esmaeili F; Mahdavi R · Amino acids · 2021
    Randomized trial45 participantsCardiovascular Support forTaurine
  38. The Protective Role of Astaxanthin for UV-Induced Skin Deterioration in Healthy People-A Randomized, Double-Blind, Placebo-Controlled Trial.
    Ito N; Seki S; Ueda F · Nutrients · 2018
    Randomized trial23 participantsSkin Health forAstaxanthin
  39. Supplementating with dietary astaxanthin combined with collagen hydrolysate improves facial elasticity and decreases matrix metalloproteinase-1 and -12 expression: a comparative study with placebo.
    Yoon HS; Cho HH; Cho S; Lee SR; Shin MH; Chung JH · Journal of medicinal food · 2015
    Randomized trial44 participantsSkin Health forAstaxanthin
  40. Continuous astaxanthin intake reduces oxidative stress and reverses age-related morphological changes of residual skin surface components in middle-aged volunteers.
    Chalyk NE; Klochkov VA; Bandaletova TY; Kyle NH; Petyaev IM · Nutrition research (New York, N.Y.) · 2018
    Single-arm trial31 participantsSkin Health forAstaxanthin
  41. Cosmetic benefits of astaxanthin on humans subjects.
    Tominaga K; Hongo N; Karato M; Yamashita E · Acta biochimica Polonica · 2012
    Other66 participantsSkin Health forAstaxanthin
  42. Evaluation of the anti-wrinkle effect of an ascorbic acid-loaded dissolving microneedle patch via a double-blind, placebo-controlled clinical study.
    Lee C; Yang H; Kim S; Kim M; Kang H; Kim N; An S; Koh J; Jung H · International journal of cosmetic science · 2017
    Randomized trial23 participantsSkin Health forVitamin C
  43. Comparative Study on the Outcome of Periorbital Wrinkles Treated with Laser-Assisted Delivery of Vitamin C or Vitamin C Plus Growth Factors: A Randomized, Double-blind, Clinical Trial.
    Machado BHB; Frame J; Zhang J; Najlah M · Aesthetic plastic surgery · 2021
    Randomized trial149 participantsSkin Health forVitamin C
  44. Randomized trial of topical ascorbic acid in DMSO versus imiquimod for the treatment of basal cell carcinoma.
    Burke B; Bailie JE · Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie · 2022
    Randomized trial25 participantsSkin Health forVitamin C
  45. Vitamin C improves healing of foot ulcers: a randomised, double-blind, placebo-controlled trial.
    Gunton JE; Girgis CM; Lau T; Vicaretti M; Begg L; Flood V · The British journal of nutrition · 2022
    Randomized trial16 participantsSkin Health forVitamin C
  46. Dietary nutrient intakes and skin-aging appearance among middle-aged American women.
    Cosgrove MC; Franco OH; Granger SP; Murray PG; Mayes AE · The American journal of clinical nutrition · 2007
    Cross-sectional study4,025 participantsSkin Health forVitamin C
  47. Effects of taurine supplementation on VDT work induced visual stress.
    Zhang M; Bi LF; Ai YD; Yang LP; Wang HB; Liu ZY; Sekine M; Kagamimori S · Amino acids · 2005
    Randomized trial25 participantsVision Support forTaurine