Vitamin C — Superior C — 500 mg — Vegetarian Capsules — Supports Immune Health & Antioxidant Protection*
LifeSource Vitamins Vitamin C — Superior C (500 mg) combines premium ascorbic acid with threonic acid, alpha lipoic acid, and citrus bioflavonoids in an easy vegetarian capsule to support immune function, antioxidant protection, collagen synthesis, iron absorption, and overall cardiovascular wellness. Produced in FDA-registered, GMP-certified facilities and
3rd-party tested for identity, potency & purity.*
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 39 leading health organizations and insights from 20 top global universities to ensure our guidance aligns with credible science.*
Clinically Studied Benefits (with research)
• Immune support — Vitamin C supports multiple immune mechanisms (barrier integrity, leukocyte function) and helps shorten common-cold duration in regular users. (NIH/PMC — Carr & Maggini, Nutrients 2017)
• Common-cold duration (adjunct) — Human RCT syntheses show regular vitamin C supplementation reduces cold duration and severity in various populations. (NIH/PMC — Hemilä, Nutrients 2017)
• Antioxidant protection — Vitamin C scavenges reactive oxygen species and regenerates other antioxidants in humans, lowering oxidative stress markers. (NIH/PMC — Carr & Maggini, 2017)
• Collagen formation & skin — Vitamin C is essential for collagen hydroxylation; human data link adequate intake with improved dermal matrix and wound outcomes. (NIH/PMC — Carr & Maggini, 2017)
• Iron absorption — Vitamin C enhances non-heme iron uptake in humans by reducing ferric to ferrous iron and forming absorbable complexes. (NIH/PMC — Lane & Richardson, 2014)
• Endothelial & cardiometabolic markers — Clinical evidence shows vitamin C can improve endothelial-dependent vasodilation and select cardiometabolic risk markers. (NIH/PMC — Carr & Maggini, 2017)
• Blood pressure (adjunct) — Meta-analytic clinical data indicate vitamin C supplementation can modestly reduce blood pressure, particularly in hypertensive adults. (NIH/PMC — Juraschek et al., 2012)
• Wound healing support — Human clinical literature associates adequate vitamin C status with improved tissue repair dynamics and ulcer outcomes. (NIH/PMC — Carr & Maggini, 2017)
Additional Studies Showing Promising Benefits*
• Vitamin C + citrus bioflavonoids — Human and mechanistic data suggest bioflavonoids may complement antioxidant networks and microvascular skin support; direct absorption synergy remains mixed. (NIH/PMC — Kaulmann & Bohn, 2016)
• Threonic acid (vitamin C metabolite) — mechanistic and preliminary evidence suggests it may influence vitamin C handling; robust human RCTs confirming superior uptake are limited. (NIH/PMC — Hemilä, 2017)
• Alpha lipoic acid — Functions in the human antioxidant network and may help recycle vitamin C; high-quality human co-supplementation trials remain limited for firm synergy claims. (NIH/PMC — Shay et al., 2009)
• Skin/photodamage (adjunct) — Oral vitamin C–containing regimens have shown signals for dermal/UV endpoints; heterogeneity and combination formulas temper certainty. (NIH/PMC — Cosmeceuticals Review, 2013)
Global Evidence & Authoritative Reviews*
• NIH ODS Fact Sheet — Clinical overview of vitamin C intake, safety, deficiency, and research. (NIH ODS)
• Harvard T.H. Chan School — Evidence summary on vitamin C and health outcomes. (Harvard Nutrition Source)
We monitor research from the world’s leading institutions — including Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge University, Oxford, Stanford, Yale, MIT, the University of Florida, Oregon State University – Linus Pauling Institute, Tufts, Boston University, Cornell, Columbia, and Ohio State — to ensure our guidance remains aligned with the highest standards of credible science.*
Brief Benefit Bullets
• Daily immune support & shorter common-cold duration (regular users)*
• Potent antioxidant protection; supports healthy oxidative balance*
• Essential for collagen — skin, blood vessels & connective tissues*
• Aids non-heme iron absorption for energy support*
• Supports endothelial function & healthy blood-pressure markers*
• Vegetarian capsules; enhanced formula with bioflavonoids*
• 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
• Servings Per Container — 90
• Actives — Vitamin C (Ascorbic Acid) 500 mg; Threonic Acid; Alpha Lipoic Acid; Citrus Bioflavonoids
• Form — Vegetarian capsules
• Free From — Non-GMO, gluten-free, vegan; not from China*
• Quality — Third-party tested for identity, potency & purity
Perfect For
• Adults seeking enhanced immune & antioxidant support*
• Individuals with low dietary vitamin C intake*
• Those aiming for skin, heart, and iron-absorption support*
Key Ingredients
Vitamin C (Ascorbic Acid) — immune support, antioxidant protection, collagen formation, and iron absorption.* (NIH/PMC — Nutrients 2017)
Threonic Acid — vitamin C metabolite included for potential handling/uptake support (emerging human evidence).* (NIH/PMC — Hemilä, 2017 (context))
Alpha Lipoic Acid — part of the antioxidant network; may help recycle vitamin C (human evidence mixed).* (NIH/PMC — Shay et al., 2009)
Citrus Bioflavonoids — plant polyphenols that complement antioxidant defenses and microvascular support.* (NIH/PMC — Kaulmann & Bohn, 2016)
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 — Superior C 500 mg vegetarian capsules with bioflavonoids, ALA & threonic acid for immune, antioxidant, collagen & iron-absorption support. Clinically Studied Ingredients — NIH/PubMed!*
