Open research questions in Vitamin C and Antioxidants Research
25 unresolved questions extracted from the limitations and future-work sections of 257 Vitamin C and Antioxidants Research papers in our library. Each links back to the study that raised it.
What the literature leaves open
This scoping review comes with several limitations related to the design and quality of the included studies, as well as the availability of guideline-based data. First, the number of studies investigating the efficacy of oral vitamin B12 1 3P.
Despite robust empirical evidence substantiating the synergistic interactions between collagen, vitamin C, and vitamin E supplementa- tion in conjunction with physical exercise among geriatric populations, considerable limitations persist that necessitate meticulous scrutiny. Numerous extant investigations are hampered by restricted sample sizes, short-term intervention durations, and limited follow-up, which complicates the extrapolation of short-term biomarker changes to long- term functional outcomes. Additionally, there is a lack of uniformity in participant characteristics, encompassing variations in age, baseline nutritional status, comorbid conditions, sex, and habitual physical activ- ity levels, which further challenges the generalizability of findings. The inconsistency in supplementation protocols, which includes variations in dosage, formulation, timing relative to exercise, and bioavailability, further complicates the comparative analysis of results across different studies. Likewise, the heterogeneity of exercise interventions, which spans modalities such as RT, BFR, endurance training, and eccentric exercise protocols, contributes additional variability in outcomes, thereby complicating the development of generalizable recommenda- tions for preventive healthy aging rather than treatment of established sarcopenia. The mechanistic comprehension of the subject matter remains incomplete; the influence of antioxidant supplementation on exercise-induced signaling cascades, encompassing MPS, mitochon- drial adaptation, redox-sensitive pathways, inflammatory modulation, and immune responses, continues to be insufficiently investigated. Moreover, most studies examine single nutrients in isolation rather than the integrated collagen–vitamin C–vitamin E triad, which limits mech- anistic clarity across musculoskeletal, metabolic, vascular, hepatic, immune, and cognitive systems. Some empirical evidence suggests that high-dose antioxidants may diminish specific adaptive responses to exercise; however, these interactions are not thoroughly elucidated within geriatric populations. Future research should prioritize well- powered, longitudinal, randomized controlled trials with multi-omic approaches (metabolomics, proteomics, genomics) and sophisticated biomarkers of oxidative stress, inflammation, immune functionality, and muscle-tendon adaptation. Studies should also stratify participants by age, baseline nutrition, training status, sex, and comorbidity profile to understand differential responses and optimize preventive outcomes. Furthermore, nascent research should examine the synergistic effects of combined nutraceutical interventions, optimal dosing regimens, timing relative to exercise, and precision-targeted exercise prescriptions to enhance musculoskeletal, metabolic, vascular, hepatic, immune, and cognitive outcomes in aging populations, with a clear focus on prophy- lactic, preventive strategies rather than therapeutic interventions for established sarcopenia or age-related disease.
The triad of collagen, vitamin C, and vitamin E in aging: emerging roles in mood and psychological health, neurotrophic support, cognitive function, endurance, and sarcopenia · 2026 · DOIIn fact, the following issues still remain unknown: types of cancer that could be sensitive to high-dose vitamin C therapy, groups of patients that could benefit from such management, doses, routes of administration and pharmaceutical forms that could provide an optimal anticancer effect, the molecular mechanism of vitamin C anticancer action, the impact of vitamin C on the concurrently used therapies, including chemotherapy, impact of vitamin C on the quality of life of oncological patients.
The use of nutritional supplements (NS) with the intention of improving health and delaying age-related chronic disease is a common practice among older adults; however, randomized controlled trials have yielded mixed results regarding the likelihood that these NS provide true health benefits.
The paper discusses exfoliation procedures and barrier repair preparations (ceramide, cholesterol, free fatty acids) but does not provide evidence regarding optimal timing, frequency, or combination protocols for these interventions in clinical practice.
The proposed treatment strategies for physicians include focusing on reversing and/or preventing inflammation and dietary adjustment, but the paper lacks guidance on standardized treatment protocols or dosing recommendations for oral supplements and dietary interventions.
The paper recommends optimization of the permeability barrier function of the cuticle to prevent activation of destructive chronic inflammation, but does not provide detailed methodology or standards for measuring and implementing this optimization.
The paper proposes that prevention and reversal of chronic inflammation should be the treatment strategy for skin and mucous membrane diseases, aging, and cancer, but lacks specific clinical trial data validating the efficacy of these proposed interventions.
In this paper, we review vitamin C physiology; the many phenomena involving vitamin C where new knowledge has accrued or where understanding remains limited; raise questions about the vitamin that remain to be answered; and explore lines of investigations that are likely to be fruitful.
Finally, there is mixed evidence regarding the cognitive enhancing properties of Ginkgo biloba, and the B vitamins folate and cobalamin, with all of these requiring further investigation.
Supplementing Cognitive Aging: A Selective Review of the Effects of Ginkgo Biloba and a Number of Everyday Nutritional Substances · 2009 · DOIAlthough dietary antioxidants, such as vitamin C, carotene, and vitamin E, have been hypothesized to prevent coronary heart disease, prospective epidemiologic data are sparse.
However, the nerve fibers distributed to the taste buds were scarce in the hypervitaminosis A group as compared with that in control group and its distribution decreased with the increase of administration.
A Neurohistological Study on the Effect of Hypervitaminosis A in Pregnant Rats on the Development of Circumvallate Papillae and Taste Buds of Their Fetuses · 1986 · DOI
Most-cited papers in Vitamin C and Antioxidants Research
- Vitamin E Consumption and the Risk of Coronary Heart Disease in Men · New England Journal of Medicine · 1993 · 1,760 citations
- Vitamin C: the known and the unknown and Goldilocks · Oral Diseases · 2016 · 650 citations
- A Randomized Factorial Trial of Vitamins C and E and Beta Carotene in the Secondary Prevention of Cardiovascular Events in Women · Archives of Internal Medicine · 2007 · 386 citations
- Plasma Vitamin C Level, Fruit and Vegetable Consumption, and the Risk of New-Onset Type 2 Diabetes Mellitus<subtitle>The European Prospective Investigation of Cancer–Norfolk Prospective Study</subtitle> · Archives of Internal Medicine · 2008 · 246 citations
- Effect of Vitamin E and Beta Carotene on the Incidence of Primary Nonfatal Myocardial Infarction and Fatal Coronary Heart Disease · Archives of Internal Medicine · 1998 · 206 citations
- Micronutritional approaches to periodontal therapy · Journal Of Clinical Periodontology · 2011 · 147 citations
- The Possible Role of Antioxidant Vitamin C in Alzheimer’s Disease Treatment and Prevention · American Journal of Alzheimer s Disease & Other Dementias® · 2013 · 66 citations
- The association between dietary vitamin C intake and periodontitis: result from the NHANES (2009–2014) · BMC Oral Health · 2022 · 35 citations
- Ferric reducing ability of plasma: a potential oxidative stress marker in stored plasma · Acta Haematologica Polonica · 2021 · 31 citations
- Common foods for boosting human immunity: A review · Food Science & Nutrition · 2023 · 31 citations
Most recent work
- Vitamin C for the management of COVID-19: a systematic review and meta-analysis of randomized controlled trials · Annals of Medicine & Surgery · 2026
- Comparing the impact of chronic energy restriction and vitamin E supplementation on the behavior of adult rats · Archivos Latinoamericanos de Nutrición · 2026
- A COMPREHENSIVE REVIEW ON ANTICANCER EFFECT OF VITAMIN C ON SPECIFIC CANCER · Zenodo (CERN European Organization for Nuclear Research) · 2026
- Systematic review and meta-analysis on vitamin C in musculoskeletal disorders · World Journal of Orthopedics · 2026
- The triad of collagen, vitamin C, and vitamin E in aging: emerging roles in mood and psychological health, neurotrophic support, cognitive function, endurance, and sarcopenia · Frontiers in Nutrition · 2026
- Effects of vitamin C supplementation on individualized oxidative stress and inflammation responses: A set of n-of-1 trials · Free Radical Biology and Medicine · 2026
- Formulation and Evaluation of Medicated Chocolate of Vitamin C · International Journal of Science Architecture Technology and Environment · 2026
- Plasma vitamin C levels are associated with brain structural networks on MRI: A large cohort study · PLOS One · 2026
- Oral vitamin B₁₂ after total gastrectomy for gastric cancer: mapping the evidence · Gastric Cancer · 2026
- Vitamins - physiological functions and signs of deficiency on the skin · Dermatologie pro praxi · 2026
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