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27 October 2008

Vitamin C-lipid metabolites: uptake and retention and effect on plasma C-reactive protein and oxidized LDL levels in healthy volunteers

Dario PancorboABCDEFG, Carlos VazquezABDEF, Mary Ann FletcherBDEF

Med Sci Monit 2008; 14(11): CR547-551 :: ID: 869441

Abstract

Background
Previously, a novel formulation of vitamin C-lipid metabolites (PureWay-C) was shown to be more rapidly taken-up by human T-lymphocytes and more rapidly stimulate neurite outgrowth, fibroblast adhesion and inhibition of xenobiotic-induced T-cell hyperactivation. Here, PureWay-C serum levels were measured in healthy volunteers after oral supplementation. Plasma C-reactive protein and oxidized low density lipoprotein levels (LDL) were also measured.
Material and Method
Healthy volunteers maintained a low vitamin C diet for 14 days and, following an overnight fast, received a single oral dose of (vitamin C) 1000 mg of either ascorbic acid (AA), calcium ascorbate (CaA), vitamin C-lipid metabolites (PureWay-C), or calcium ascorbate-calcium threonate-dehydroascorbate (Ester-C). Blood samples were collected immediately prior to the oral dose administration and at various times post ingestion. Twenty-four-hour urine collections were saved for oxalate and uric acid assays.
Results
PureWay-C supplementation leads to the highest absolute serum vitamin C levels when compared to AA, CaA and Ester-C. PureWay-C provides a statistically significant greater serum level than calcium ascorbate at 1, 2, 4, and 6 hours post oral supplementation whereas Ester-C shows a less but slightly statistically significant increase at only 1 and 4 hours. Oral supplementation with PureWay-C also led to a greater reduction in plasma C-reactive protein and oxidized LDL levels compared to the other vitamin C formulations.
Conclusions
PureWay-C is more rapidly absorbed and leads to higher serum vitamin C levels and greater reduction of plasma levels of inflammatory and oxidative stress markers than other forms of vitamin C, including Ester-C.

Keywords: Uric Acid - urine, Oxalic Acid - urine, Lipid Metabolism - drug effects, Lipoproteins, LDL - blood, Health, young adult, C-Reactive Protein - metabolism, Ascorbic Acid - pharmacology, Adult

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750