Vitamin C is perhaps the world's most familiar dietary supplement — yet its full range of roles in the body is often underappreciated. Beyond the winter cold prevention associations that most people know, vitamin C is involved in collagen synthesis, iron absorption, antioxidant defence, energy metabolism, and neurological function. This guide explores what vitamin C really does and helps you choose between the many supplement forms available in Ireland.
Vitamin C (ascorbic acid) is a water-soluble vitamin and potent antioxidant. Humans are among the few mammals that cannot synthesise vitamin C in the body — we must obtain it entirely from food or supplements. The body's vitamin C stores are limited, and regular dietary intake is essential.
The classical deficiency disease scurvy — caused by months of no vitamin C — is now rare, but sub-optimal vitamin C status is common in people with poor diets, heavy smokers (who deplete vitamin C much faster), older adults, and those under significant physical or psychological stress.
Vitamin C is concentrated in immune cells, particularly phagocytes and T-lymphocytes, and is rapidly used up during infections. Research suggests vitamin C may support immune function in several ways:
The EU has approved the health claim that vitamin C "contributes to the normal function of the immune system."
Vitamin C is essential for the synthesis of collagen — the most abundant protein in the body, making up the structure of skin, tendons, ligaments, bones and blood vessels. Without adequate vitamin C, collagen production is impaired, leading to poor wound healing, fragile skin and capillaries.
Topical and supplemental vitamin C are both used for skin health. Research suggests vitamin C may:
Vitamin C significantly enhances the absorption of non-haem iron (iron from plant foods). Taking vitamin C alongside iron-rich plant foods or iron supplements can increase iron absorption by up to 3–6 times. This is particularly important for vegetarians, vegans and people with iron deficiency.
Vitamin C is one of the body's most important antioxidants. It neutralises free radicals in aqueous (water-based) environments both inside and outside cells, and it helps regenerate vitamin E (the fat-soluble antioxidant), creating a synergistic antioxidant effect.
Vitamin C is involved in the synthesis of carnitine (needed for fat metabolism and energy production) and supports the conversion of dopamine to noradrenaline. Adrenal glands have the highest vitamin C concentration of any body tissue, and vitamin C is rapidly depleted during periods of stress. Some practitioners recommend higher vitamin C intake during periods of illness, surgery, or intense psychological or physical stress.
Some research suggests associations between vitamin C status and cardiovascular health markers, including blood pressure and arterial function. Vitamin C's role in collagen synthesis also contributes to vascular integrity.
Good Irish dietary sources of vitamin C include:
Vitamin C is heat-sensitive and water-soluble — prolonged cooking reduces vitamin C content significantly. Raw or lightly cooked vegetables retain more vitamin C than heavily boiled ones.
Standard vitamin C in its pure form. Highly effective and well-researched. The most affordable option. Can cause stomach upset in sensitive individuals at high doses — take with food. Slightly acidic, which some people notice as a fizzy sensation.
Vitamin C bound to a mineral to make it less acidic. Gentler on the stomach, making it a good choice for those who experience digestive upset with regular ascorbic acid. Slightly lower dose of vitamin C per gram due to the mineral component.
Many quality vitamin C products include bioflavonoids (such as rutin, hesperidin, quercetin) from citrus peel or rose hip. Bioflavonoids are plant compounds that may work synergistically with vitamin C and enhance absorption.
A buffered, patented form of calcium ascorbate with metabolites that some research suggests may be better retained in tissues and white blood cells than regular ascorbic acid. Generally well-tolerated.
The newest and most innovative form. Liposomal vitamin C encapsulates ascorbic acid inside phospholipid liposomes — tiny spheres similar to cell membranes. This protects the vitamin C from degradation in the digestive tract and is thought to deliver it directly into cells more efficiently.
Proponents argue that liposomal vitamin C achieves higher plasma concentrations than regular oral vitamin C at equivalent doses, effectively "bypassing" the intestinal absorption bottleneck. Some research supports higher bioavailability, though the size of this advantage is debated.
Liposomal vitamin C is significantly more expensive than regular forms but may be worthwhile for therapeutic purposes, high-dose protocols, or those who struggle with digestive upset from regular vitamin C.
Very high doses (above 2000mg daily) can cause diarrhoea and digestive upset in some people, and should be approached carefully. Vitamin C does not accumulate in the body as it is water-soluble.
Find standard, buffered and liposomal vitamin C at The Honey Pot Health Store
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