Vitamin C: The Cornerstone Antioxidant and Collagen Catalyst
What Is Vitamin C?
Vitamin C, ascorbic acid, is a water-soluble vitamin that humans cannot synthesise. Unlike most mammals, humans lack the enzyme L-gulonolactone oxidase, meaning we must obtain all of our vitamin C from food or supplements. This evolutionary dependency reflects how critical vitamin C is to human physiology: it is required for dozens of enzymes and acts as a frontline antioxidant in virtually every tissue.
Vitamin C is perhaps the most widely studied nutrient in human history, with thousands of peer-reviewed publications documenting its roles in immunity, collagen synthesis, antioxidant defence, iron absorption, and energy metabolism.
Vitamin C and Collagen: A Molecular Partnership
Vitamin C's most fundamental biochemical role is as an enzyme cofactor for prolyl hydroxylases and lysyl hydroxylase, the enzymes that hydroxylate proline and lysine residues in procollagen. These hydroxylation reactions are mandatory steps in collagen maturation. Without vitamin C, these enzymes cannot function and collagen synthesis stalls.
This is the molecular basis of scurvy, the historical disease of severe vitamin C deficiency, characterised by the breakdown of all collagen-dependent tissues. At optimised levels, vitamin C actively accelerates collagen turnover and quality, contributing to firmer skin, stronger tendons, and better joint integrity.
In Formulae, vitamin C works in direct molecular partnership with L-Lysine, which provides the lysine residues that vitamin C hydroxylates, making this combination biochemically synergistic for collagen formation.
Vitamin C as an Antioxidant
Vitamin C is one of the most important water-soluble antioxidants in human physiology. It scavenges superoxide, hydroxyl radicals, and singlet oxygen in the aqueous compartments of cells and plasma. It also regenerates vitamin E from its oxidised form, extending the antioxidant capacity of lipid membranes. This role is directly complementary to glutathione in Formulae.
Vitamin C and Immune Function
Vitamin C supports multiple components of innate and adaptive immunity: neutrophil chemotaxis and phagocytosis, natural killer cell activity, lymphocyte proliferation, and the skin's epithelial barrier. Plasma vitamin C levels drop rapidly during infection as immune cells consume it at accelerated rates.
Vitamin C and Iron Absorption
Vitamin C significantly enhances absorption of non-haeme iron (from plant sources) by reducing ferric iron (Fe³⁺) to ferrous iron (Fe²⁺). For individuals following plant-rich diets, common across Southeast Asia, vitamin C is one of the most practical tools for improving iron bioavailability from food.
Why Vitamin C Is in Formulae
Vitamin C earns its place in Formulae as a critical molecular partner for multiple other ingredients: essential for activating the collagen-building effects of L-Lysine, for regenerating glutathione and vitamin E, and for improving iron absorption. It is the connective tissue of the Formulae formula, both literally and functionally.
The Research
A 2019 review by Macan et al. covering the full scope of ascorbic acid's biological roles, with 120 citations, confirms vitamin C's essential function as both a potent antioxidant and cofactor in collagen biosynthesis, with particular emphasis on its role protecting cellular components against oxidative damage linked to chronic disease development.[1]
A computational study by Chugaeva et al. provided molecular-level confirmation of vitamin C's mechanism in collagen formation: vitamin C acts as a cofactor for prolyl 5-hydroxylase, converting proline to hydroxyproline, a reaction that cannot proceed without ascorbic acid. Without this step, the collagen triple helix cannot properly form or stabilise.[2]
A 2025 comprehensive review by Yameny establishes that vitamin C functions as a cofactor for both prolyl and lysyl hydroxylases in the endoplasmic reticulum, enabling the hydroxylation of proline and lysine residues essential for collagen structural integrity, folding, and extracellular secretion. The review also confirms vitamin C's roles in immune function, wound healing, skin health, and antioxidant synergy, positioning it as one of the most broadly essential micronutrients in human physiology.[3]
References
- Macan AM et al. (2019). Therapeutic Perspective of Vitamin C and Its Derivatives. Antioxidants. 120 citations.
- Chugaeva UY et al. (2023). Effects of l-ascorbic acid (Vit-C) on collagen amino acids: DFT study. Amino Acids. 6 citations.
- Yameny K (2025). Vitamin C in Human Health: Biochemistry, Physiology, and Pathophysiology. Pharaonic Journal of Science.