Vitamin C IV

What is Vitamin C IV?

L-Ascorbic acid (vitamin C) serves multiple critical biochemical roles beyond its well-known antioxidant function. As a cofactor for prolyl and lysyl hydroxylases, ascorbate is absolutely required for collagen triple helix stability—without adequate vitamin C, collagen synthesis fails, manifesting as scurvy. The vitamin also serves as cofactor for dopamine β-hydroxylase (converting dopamine to norepinephrine) and other copper-containing monooxygenases essential for neurotransmitter synthesis.

As an antioxidant, ascorbate directly reduces reactive oxygen species and serves as the first line of defense in aqueous environments. It functions synergistically with vitamin E by reducing tocopheroxyl radicals back to active tocopherol, linking water-soluble and lipid-soluble antioxidant systems. This pharmaceutical-grade Liquid Reagent preparation enables precise dosing in controlled research applications.

Mechanism of Action

At physiological concentrations achieved through oral application, ascorbic acid functions as an essential cofactor for enzymatic reactions including collagen synthesis (prolyl and lysyl hydroxylases), carnitine biosynthesis, and catecholamine metabolism. However, intravenous application achieves plasma concentrations 30-70-fold higher than oral dosing, fundamentally changing the molecule's biological activity. At these pharmacological concentrations, ascorbate acts as a pro-oxidant in the presence of transition metals, generating hydrogen peroxide through Fenton chemistry—a mechanism distinct from its antioxidant role at physiological levels.

This concentration-dependent shift from antioxidant to pro-oxidant creates selective cytotoxicity toward cancer cells while sparing normal cells. Cancer cells accumulate more ascorbate through upregulated GLUT1 transporters, have higher levels of redox-active iron, and possess lower catalase activity to decompose the resulting hydrogen peroxide. The generated H₂O₂ damages cancer cell membranes, proteins, and DNA. This pharmacokinetic distinction—where route of application determines mechanism of action—makes high-dose intravenous ascorbate a unique research tool for studying redox biology, differential cellular responses to oxidative stress, and metabolic vulnerabilities in cancer cells.

Key Research Findings

• Achieves pharmacological plasma concentrations (millimolar range) through intravenous application that produce pro-oxidant effects distinct from oral dosing's antioxidant mechanisms (Padayatty et al. Ann Intern Med 2004;140(7):533-7. PMID: 15068981)
• Generates hydrogen peroxide through Fenton chemistry at high concentrations, creating selective cytotoxicity toward cells with impaired antioxidant defenses
• Demonstrates differential uptake and toxicity profiles between normal and cancer cells based on GLUT transporter expression, redox-active iron levels, and catalase activity

Research Applications

• Collagen hydroxylation research
• Ascorbate-dependent enzyme studies
• Antioxidant mechanism research
• Iron metabolism
• Neurotransmitter synthesis pathways
• Immune cell function studies
• Vitamin C-dependent biochemistry

Reconstitution & Use

Reconstitute with bacteriostatic water for laboratory use. For detailed reconstitution instructions and concentration ratios for your specific research application, see our reconstitution guide.

Storage & Handling

Store refrigerated at 2-8°C protected from light (photosensitive). Use within 14 days after opening. Ascorbic acid oxidizes in solution over time; fresh preparations provide optimal activity. Do not freeze.