Vitamin C Deficiency: Signs, Risks & How to Support

Vitamin C (ascorbic acid) is a water-soluble nutrient the human body cannot produce on its own, due to mutations in the L-gulonolactone oxidase (GLO) gene responsible for synthesizing it from L-gulono-1,4-lactones. That means every milligram must come from food or supplementation — and when intake falls short, the consequences can be serious.

Clinically, hypovitaminosis C — or Vitamin C deficiency — is defined by a plasma ascorbic acid level below 23 µmol/L (approximately 0.4 mg/dL). Overt deficiency symptoms occur only if Vitamin C intake falls below approximately 10 mg/day for many weeks, but even sub-optimal levels may compromise the body's ability to maintain connective tissue, fight oxidative stress, and support immune function.

The most severe form of Vitamin C deficiency is scurvy, which causes fatigue, inflammation of the gums, small red or purple spots on the skin, joint pain, poor wound healing, and corkscrew hairs. Additional signs include depression, swollen and bleeding gums, loosening or loss of teeth, and anemia. Scurvy is fatal if it is not treated.

Today, scurvy is extremely rare because of improved food supplies, vitamin-fortified foods, and vitamin supplements, but it can occur in populations with poor diets. A plasma level of 50 µmol/L (~0.9 mg/dL) is now widely considered the threshold for adequacy — a level sufficient to meet metabolic demands and support overall well-being.

Vitamin C is far more than an immune nutrient. It is a potent antioxidant and a cofactor for many enzymes, involved in biological functions that span nearly every body system.

Collagen and Connective Tissue

The body needs Vitamin C to make collagen — the most abundant protein in the human body. Without adequate Vitamin C, prolyl and lysyl hydroxylase enzymes cannot properly hydroxylate collagen precursors, leading to structurally defective collagen. This failure is the biochemical basis of scurvy's hallmark connective tissue breakdown.

Antioxidant Defense

Vitamin C functions as a water-soluble antioxidant, quenching reactive oxygen species (ROS) and reactive nitrogen species in aqueous cellular environments. It also regenerates other antioxidants such as vitamin E, potentially helping to limit oxidative stress-related damage.

Iron Absorption

Vitamin C improves the absorption of iron from plant-based foods by reducing ferric iron (Fe³⁺) to ferrous iron (Fe²⁺) in the gastrointestinal lumen — a form more readily absorbed by intestinal mucosal cells. This is clinically relevant in the management of non-heme iron deficiency.

Immune Cell Support

Vitamin C contributes to immune defense by supporting various cellular functions of both the innate and adaptive immune system. Research suggests it helps maintain epithelial barrier function, enhances the differentiation and proliferation of B cells and T cells, enhances phagocytosis, normalizes cytokine production, and decreases histamine levels.

Nervous System and Adrenal Function

Ascorbate is present in high concentrations in the adrenal glands and brain, where it participates in the production of adrenal steroids, catecholamines, and neurotransmitter synthesis including norepinephrine.

Nature's Sunshine Vitamin C Time Release is designed to deliver Vitamin C's benefits steadily throughout the day. Each tablet includes a special coating that slows the absorption of the nutrients until they reach the intestines — an important design consideration, since intestinal absorption of ascorbic acid is dose-dependent and absorption falls to about 50 percent or less with increasing doses above 1 g/day.

The formula goes beyond isolated ascorbic acid. The Vitamin C in this product is blended with a base of Rose hips extract, acerola extract, Rutin, Lemon bioflavonoids, and Hesperidin complex — a combination of naturally sourced compounds that complement the primary Vitamin C.

This is a completely natural product with no sugar, starch, artificial colorings or flavorings, and it carries both vegan and non-GMO attributes. If you have questions about whether this formula is right for your individual needs, our naturopath is available for a free consultation — just reach out.

While severe Vitamin C deficiency is uncommon in developed countries, sub-optimal levels are more prevalent than many people realize. The Recommended Dietary Allowance (RDA) is 90 mg/day for adult men and 75 mg/day for adult women, with smokers recommended to increase their consumption by an additional 35 mg/day. Pregnant and lactating women have higher needs of 85 mg and 120 mg per day, respectively.

People at greater risk for insufficient Vitamin C intake include:

• Smokers and those exposed to secondhand smoke, because oxidative stress increases Vitamin C turnover
• People whose diets are limited in fruits and vegetables — the best food sources of Vitamin C include citrus fruits, red and green peppers, kiwifruit, broccoli, and strawberries
• Individuals with certain conditions that may impair absorption or increase nutrient demands

Because Vitamin C is water-soluble and susceptible to heat — up to 50 percent can be lost during cooking — even people who eat produce may not be getting as much as they think. Supplementation may help bridge the gap, especially in a time-release format that supports sustained absorption throughout the day.

If you're unsure whether you might benefit from supplemental Vitamin C, our naturopath offers free consultations to help you evaluate your individual needs.

Take one tablet daily with a meal. The time-release coating is specifically designed to slow nutrient absorption until the tablet reaches the intestines, helping to deliver Vitamin C steadily rather than in a single burst — an important consideration given that absorption efficiency decreases at higher single doses.

Each bottle contains 120 tablets, providing a four-month supply at the recommended serving size of one tablet per day.