Vitamin C 1000 mg — 1,000 mg per Serving — Supports Immune Health & Antioxidant Protection*
LifeSource Vitamins Vitamin C 1000 mg delivers clinically studied ascorbic acid to support immune function, help reduce common-cold duration (with regular use), provide antioxidant protection, aid collagen/wound repair, enhance non-heme iron absorption, and support cardiometabolic markers. Produced in FDA-registered, GMP-certified facilities and 3rd-party tested for identity, potency & purity.*
Research-Driven & Verified Product.
Explore the clinical research, ingredient science, and global evidence supporting this product below.
Research Promise: At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is supported by human clinical studies indexed in the National Institutes of Health (NIH) via PubMed, with full texts available in the National Library of Medicine (NLM) PubMed Central (PMC) when available. In addition, we reference reviews from leading health organizations and insights from top global universities to ensure our guidance aligns with credible science.*
Clinically Studied Benefits
✓ Supports immune support — Vitamin C supports epithelial barrier integrity and leukocyte functions; regular use is associated with shorter common-cold duration.
NIH/PubMed — Carr, 2017
✓ Common-cold duration (adjunct) — Meta-analyses of human RCTs show reduced duration/severity with regular vitamin C supplementation.
NIH/PubMed — Hemilä, 2013
✓ Incidence reduction in high-physical-stress groups — Fewer colds in athletes/heavy-exertion settings with prophylactic vitamin C (human RCT syntheses).
NIH/PubMed — Hemilä, 2013
✓ Antioxidant protection — Ascorbate scavenges reactive oxygen species and helps regenerate other antioxidants; human data show lower oxidative stress markers.
NIH/PubMed — Carr, 2017
✓ Collagen formation & wound repair — Essential cofactor for collagen hydroxylation; human literature links adequate C to improved dermal matrix and wound outcomes.
NIH/PubMed — Carr, 2017
✓ Iron absorption — Enhances non-heme iron uptake by reducing Fe³⁺→Fe²⁺ and forming absorbable complexes (human evidence/mechanisms).
NIH/PubMed — Lane, 2014
✓ Supports healthy endothelial function and overall vascular wellness as part of general health — Evidence for improved endothelial-dependent vasodilation and select risk markers with vitamin C.
NIH/PubMed — Carr, 2017
✓ Provides antioxidant support for healthy vascular function (adjunct) — Meta-analysis of RCTs reports modest reductions, especially in hypertensive adults.
NIH/PubMed — Juraschek, 2012
Additional / Promising Evidence
✓ Skin/photodamage (adjunct) — Oral vitamin C–containing regimens show signals for UV/dermal endpoints; heterogeneity/combination formulas temper certainty.
NIH/PubMed — Pullar, 2013
✓ Respiratory/oxidative-stress contexts — Review-level human evidence suggests supportive roles under oxidative burden (setting/dose dependent).
NIH/PubMed — Carr, 2017
University-Led & Academic Studies
✓ Immune support — Vitamin C supports epithelial barrier integrity and leukocyte functions; regular use helps shorten common-cold duration.
NIH/PubMed — Carr, 2017
✓ Collagen formation & wound repair — Essential cofactor for collagen hydroxylation; human data link adequate vitamin C to improved dermal matrix and wound outcomes.
NIH/PubMed — Carr, 2017
Global Evidence & Reviews
✓ NIH ODS Fact Sheet — Comprehensive overview of vitamin C functions, intake & safety.
NIH/ODS — Vitamin C
✓ Harvard T.H. Chan — Nutrition Source review on vitamin C & health.
Harvard — Vitamin C
✓ Johns Hopkins Medicine — Vitamin C & antioxidant education.
Johns Hopkins — Vitamin C
We monitor research from leading institutions —
Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge, Oxford, Stanford, Yale, Tufts, University of Florida, Oregon State University – Linus Pauling Institute, Columbia, Cornell, Ohio State — to align with credible science.*
Key Ingredients
Brief Benefit Bullets
- Daily immune support; helps shorten common-cold duration with regular use*
- Potent antioxidant protection*
- Collagen cofactor for skin, vessels, bones & joints*
- Enhances non-heme iron absorption*
- Adjunct support for healthy endothelial function & blood pressure*
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3rd-party lab tested for purity & potency
Suggested Use
Take 1 capsule daily with a meal, or as directed by your healthcare professional. Do not exceed recommended dose. If pregnant, nursing, taking medications, or have a medical condition, consult your physician.*
Product Specifications
• Serving Size — 1 vegetarian capsule (1,000 mg vitamin C) or 1 Tablet
• Active — Ascorbic Acid — 1,000 mg per serving
• Form — Veggie capsules & Tablets
• Free From — Non-GMO, gluten-free, vegan*
• Quality — Third-party tested for identity, potency & purity
LifeSource Vitamins — Proudly American — Since 1992
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Vitamin C 1000 mg — immune & antioxidant support; collagen & iron absorption cofactor. Clinically Studied Ingredients — NIH/PubMed!*
