Vitamin C Benefits: Immune, Antioxidant & Collagen

Name: Vitamin C (1000 mg, Time Release)
Brand: Nature's Sunshine
SKU: 3240
Price: 35.70 USD
Availability: InStock
Rating: 4.8 (5 reviews)

Explore Vitamin C benefits for immune health, antioxidant defense, and collagen production. Learn how time-release Vitamin C with bioflavonoids supports your body.

Essential Nutrient

Understanding Vitamin C Benefits

Vitamin C — also known as ascorbic acid — is a water-soluble nutrient the human body cannot produce on its own. Because of mutations in the L-gulonolactone oxidase (GLO) gene, we rely entirely on diet and supplementation to meet our needs. That single fact makes Vitamin C one of the most important nutrients to get right every day.

The Vitamin C benefits that matter most center on three areas: immune system support, antioxidant defense, and collagen production. As a potent reducing agent, Vitamin C directly scavenges reactive oxygen species in aqueous cellular compartments and plasma, and it regenerates the antioxidant form of vitamin E at membrane interfaces. It also serves as an essential cofactor for collagen prolyl hydroxylases — without adequate Vitamin C, the body cannot properly hydroxylate collagen precursors, leading to structurally defective collagen.

Beyond those headline roles, Vitamin C supports carnitine synthesis, production of adrenal steroids and catecholamines, amino acid metabolism, and the absorption of non-heme iron from plant-based foods. It is present in high concentrations in the adrenal glands and brain, where it participates in neurotransmitter synthesis.

How It Works

Why Time-Release Delivery and Bioflavonoids Matter

Nature's Sunshine Vitamin C Time Release is designed to deliver Vitamin C benefits throughout the day rather than in a single burst. Each tablet includes a special coating that slows the absorption of nutrients until they reach the intestines. This matters because intestinal absorption of ascorbic acid is saturable and dose-dependent — at usual dietary intakes of 30 to 180 mg/day, roughly 70 to 90 percent is absorbed, but absorption falls to about 50 percent or less with doses above 1 g/day. A time-release approach helps the body make the most of each tablet.

This formula goes further by blending ascorbic acid with a base of Rose hips extract, acerola extract, Rutin, Lemon bioflavonoids, and Hesperidin complex. These companion compounds are not filler — they are biologically active in their own right, offering antioxidant, anti-inflammatory, and immune-supportive properties that complement Vitamin C. The result 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 a time-release formula is the right fit for your routine, our naturopath is available for a free consultation — no appointment pressure, just helpful guidance.

What's inside

Key ingredients

Vitamin C (ascorbic acid) — 10000 mg

Vitamin C is a water-soluble antioxidant and essential cofactor for numerous enzymes. Research demonstrates that it directly scavenges reactive oxygen species in plasma and aqueous cellular compartments and regenerates the antioxidant form of vitamin E. It is required for collagen biosynthesis — acting as a cofactor for prolyl and lysyl hydroxylases — and supports iron absorption by reducing ferric iron to its more absorbable ferrous form. Vitamin C contributes to immune defense by supporting epithelial barrier function, enhancing phagocytosis, promoting the differentiation and proliferation of B cells and T cells, normalizing cytokine production, and decreasing histamine levels. A Cochrane review of 29 trials involving over 11,000 participants found that regular supplementation modestly reduces common cold duration (8% in adults, 14% in children) and severity, with more pronounced benefits in people under severe physical stress such as marathon runners. Studies also suggest Vitamin C supports bronchial health, with supplementation at ≥400 mg/day improving FEV1% in patients with chronic obstructive pulmonary disease. In the context of healthy aging, epidemiological data link higher Vitamin C intake to longer telomere length and reduced age-related disease risk. The AREDS trial demonstrated that a combination formula including 500 mg Vitamin C may reduce progression to advanced age-related macular degeneration by 25% over five years, though this benefit cannot be attributed to Vitamin C alone.

Rose hips — 25 mg

Rose hips are the pseudo fruits of Rosa canina, one of the richest natural plant sources of Vitamin C, with reported content ranging from 40 to 1,300 mg per 100 g depending on variety and processing. Beyond ascorbic acid, Rose hips contain polyphenols, carotenoids (lycopene, beta-carotene), tocopherols, flavonoids, and the galactolipid GOPO. Rose hip extract ranks among the highest measured antioxidant activities of tested fruits by ORAC, TRAP, and HORAC assays, and clinical studies confirm increased antioxidant status in healthy adults following supplementation. Research suggests the Vitamin C content in Rose hips supports immune defense, and meta-analyses of Vitamin C supplementation show an 8–14% reduction in cold duration in adults — directly applicable to Rose hips' principal bioactive. A double-blind RCT showed rose hip powder reduced skin aging markers including wrinkle depth and moisture loss while extending red blood cell longevity by reducing membrane oxidative disintegration. Anti-inflammatory flavonoids, including quercetin, may soothe airway mucous membranes and exhibit antihistamine-like properties relevant to upper respiratory comfort. Historically, Rose hips have been used across European, Scandinavian, and Native American traditions as an immune staple and recovery tonic during cold-season illness.

acerola fruit extract — 25 mg

Acerola (listed in this formula as acerola fruit extract) is a concentrated source of anthocyanins and polyphenolic compounds with documented antioxidant properties. Research shows that tart Cherry anthocyanins upregulate endogenous antioxidant pathways, including the Nrf2/ARE pathway, and human RCTs demonstrate increased DNA repair enzyme (OGG1) activity and reduced oxidative stress markers such as MDA and oxidized LDL following supplementation. The anthocyanins modulate immune-inflammatory signaling by inhibiting COX-1/2 and NF-κB, reducing TNF-α, IL-1β, and IL-6 in human studies, reflecting immune system modulation rather than simple immunostimulation. RCTs in older adults show these compounds reduce CRP at rest, supporting a role in healthy aging by addressing systemic inflammation, oxidative stress, and LDL cholesterol simultaneously.

Rutin — 25 mg

Rutin (quercetin-3-O-rutinoside) is a flavonoid glycoside found in buckwheat, citrus fruits, and many other plants. It is a well-documented antioxidant that works through direct free-radical scavenging, upregulation of endogenous antioxidant enzymes (SOD, catalase, glutathione peroxidase), and activation of the Nrf2/ARE pathway. Preclinical evidence consistently shows reductions in oxidative stress biomarkers such as MDA and ROS. Rutin modulates multiple arms of immunity: it suppresses pro-inflammatory cytokine production from human macrophages, inhibits mast cell activation relevant to allergic immunity, modulates Th1/Th2 balance, and exerts NF-κB-dependent immunomodulatory effects. Research also shows Rutin inhibited IgE-mediated histamine release and intracellular Calcium elevation in mast cells, suppressing TNF-α, IL-1β, IL-6, and IL-8 production — properties relevant to seasonal respiratory comfort. Additionally, Rutin has been investigated for aging-related metabolic dysfunction, cellular senescence, and neuroprotective effects in preclinical Alzheimer's and vascular dementia models.

Hesperidin bioflavonoid extract — 25 mg

Hesperidin is a flavanone glycoside characteristic of citrus fruits, particularly orange peel. Its aglycone form, hesperetin, is the primary bioactive metabolite. Hesperidin is recognized as a potent natural antioxidant that scavenges reactive oxygen species, enhances endogenous antioxidant enzyme activity (SOD, catalase, glutathione), and activates the ERK/Nrf2 signaling pathway — effects demonstrated in vitro, in animal studies, and in human RCTs measuring oxidative stress biomarkers. A human RCT showed a Hesperidin-containing supplement improved immune function in adults and enhanced the oxidative-inflammatory state by downregulating pro-inflammatory cytokines (TNF-α, IL-1β, IL-6) and upregulating anti-inflammatory IL-10. Research suggests Hesperidin exhibits anti-allergic properties by inhibiting mast cell degranulation, reducing histamine release, and suppressing IgE-mediated responses. A limited number of clinical trials have also shown Hesperidin-enriched supplements may improve cerebral blood flow and cognition in older adults, though most human evidence derives from flavanone-enriched supplementation trials rather than pure Hesperidin studies.

Lemon bioflavonoid extract — 25 mg

Lemon bioflavonoids are a complex of phenolic compounds from Citrus × limon, including Hesperidin, eriocitrin, diosmin, and naringenin. Lemon is a well-characterized source of flavonoids with documented antioxidant capacity — a double-blind RCT found that citrus extract combined with Vitamin C significantly increased lipoprotein oxidation lag time, outperforming vitamin E as an antioxidant. Lemon's Vitamin C content supports immune defense against respiratory infections; a clinical review found that Vitamin C intake improved symptoms and shortened duration of respiratory tract infections, though preventive effects in non-deficient individuals are modest. The Hesperidin in Lemon supports antiviral immune defenses, with computational and in vitro evidence of binding viral proteins. Vitamin C from Lemon also supports natural killer cell activity, lymphocyte function, and interferon production relevant to viral clearance. Traditionally, Lemon has been used across multiple cultures for sore throat relief and fever management, attributed to its antimicrobial and Vitamin C properties.

dicalcium phosphate

Dicalcium phosphate is a Calcium salt used as a tablet base and a source of Calcium and phosphorus. Calcium is the most abundant mineral in the human body, with more than 99% stored in bone as hydroxyapatite. It plays essential roles in muscle contraction, neurotransmission, hormone secretion, and cell signaling. Calcium absorption from dietary sources and supplements averages about 30%, and vitamin D helps the body absorb Calcium more effectively.

Vitamin C (1000 mg, Time Release)

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Vitamin C (1000 mg, Time Release)

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Who Benefits

Who Should Consider a Vitamin C Supplement

The Vitamin C benefits in this formula are broad enough for most adults, but certain groups may find time-release Vitamin C especially relevant:

Anyone focused on immune resilience. Vitamin C accumulates in leukocytes, supports phagocytosis and chemotaxis, and is rapidly consumed during infection. Research shows plasma concentrations decline quickly during viral infections, increasing demand.
People under physical stress. Evidence is stronger for populations under heavy physical or cold stress — such as athletes and those with physically demanding work — who may see a greater reduction in common cold incidence and duration with regular supplementation.
Adults concerned with healthy aging. Vitamin C is essential for collagen synthesis, connective tissue integrity, and antioxidant defense — all processes that decline with age. Epidemiological data link higher intake to longer telomere length and reduced age-related disease risk.
Those seeking antioxidant support. As a water-soluble antioxidant, Vitamin C quenches reactive oxygen species in plasma and regenerates vitamin E, supporting the body's broader antioxidant network.
Individuals with higher nutrient demands. Smokers are recommended to increase their Vitamin C consumption by 35 mg per day, and pregnant or lactating women have increased recommended intakes (85 mg and 120 mg per day, respectively).

This formula is vegan and non-GMO, making it accessible to a wide range of dietary preferences. If you're unsure whether Vitamin C supplementation fits your individual needs, our naturopath offers free consultations to help you sort through the options.

Usage

How to Take This Vitamin C Formula

Take one tablet daily with a meal. Taking Vitamin C with food supports absorption and reduces the likelihood of gastrointestinal discomfort. The time-release coating is designed to slow nutrient release until the tablet reaches the intestines, helping maintain Vitamin C levels throughout the day rather than delivering a single spike.

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

About the author

Written by Greg Howlett

Greg Howlett

Founder

Greg has spent over a decade helping customers choose the right natural-health products. He personally vets every formula we carry and writes these guides to cut through the marketing noise with practical, experience-based advice.

FAQ

Frequently asked questions

Does Vitamin C prevent the common cold?

A Cochrane review of 29 trials involving over 11,000 participants found that regular Vitamin C supplementation does not reduce the incidence of colds in the general population. However, it modestly reduces cold duration — by about 8% in adults and 14% in children — and may reduce severity. People under severe physical stress, such as marathon runners or military personnel, appear to see greater preventive benefit. Taking Vitamin C after cold symptoms have already started does not appear to be helpful.

What is the recommended daily intake of Vitamin C?

The U.S. federal government's Recommended Dietary Allowance (RDA) for Vitamin C is 90 mg/day for adult males and 75 mg/day for adult females. Pregnant women are recommended 85 mg/day, and lactating women 120 mg/day. Smokers are advised to add 35 mg/day to these amounts. The Tolerable Upper Intake Level set by the Institute of Medicine is 2,000 mg/day for adults, above which gastrointestinal discomfort and other side effects become more likely.

Why are bioflavonoids included with Vitamin C?

This formula blends ascorbic acid with Rose hips extract, acerola extract, Rutin, Lemon bioflavonoids, and Hesperidin complex. These naturally occurring plant compounds offer their own antioxidant, anti-inflammatory, and immune-supportive properties. Rose hips are one of the richest natural sources of Vitamin C and contain polyphenols and carotenoids; Rutin and Hesperidin are flavonoids that research suggests may support mast cell stability, cytokine modulation, and vascular health.

What makes time-release Vitamin C different?

Intestinal absorption of ascorbic acid is dose-dependent — about 70 to 90 percent of moderate intakes is absorbed, but absorption falls to roughly 50 percent or less with single doses above 1 g. The time-release coating in this formula slows nutrient release until it reaches the intestines, which helps maintain steadier Vitamin C levels throughout the day rather than overwhelming absorption capacity at once.

Are there any safety concerns with Vitamin C supplements?

At suggested doses, Vitamin C supplements are generally considered safe. Because the body cannot store Vitamin C, serious side effects are rare. However, amounts above 2,000 mg/day may cause stomach upset, diarrhea, or cramping. At high doses, a minor metabolite called oxalate can contribute to kidney stone risk, especially in people with existing risk factors. People with G6PD deficiency, hemochromatosis, or those on certain medications (including chemotherapy agents, statins with niacin, estrogen-containing medications, and protease inhibitors) should consult a healthcare provider before supplementing.

Can I get enough Vitamin C from food alone?

Many people do. According to the National Health and Nutrition Examination Survey (NHANES), mean intakes from food are 105.2 mg/day for adult males and 83.6 mg/day for adult females, which meets the RDA for most nonsmoking adults. The best food sources include citrus fruits, red and green peppers, kiwifruit, broccoli, and strawberries. However, Vitamin C is water-soluble and sensitive to heat — up to 50 percent can be lost through cooking. Supplementation may be helpful for those whose diets are limited or who have increased demands.

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