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Vitamin C Tablets | Time Release Immune Support

Explore our in-depth guide on Vitamin C tablets with time release technology, Rose hips, and bioflavonoids for immune support, antioxidant defense, and collagen production.

Overview

Vitamin C Tablets: Sustained Support Throughout Your Day

Vitamin C is one of the most essential and extensively studied nutrients in human health. Because the body cannot produce it on its own — due to a mutation in the L-gulonolactone oxidase gene — we depend entirely on diet and supplementation to meet our needs. These Vitamin C tablets from Nature's Sunshine deliver 1,000 mg of Vitamin C (ascorbic acid) in a time release format designed to provide benefits throughout the day rather than in a single burst.

Each tablet features a special coating that slows nutrient absorption until the ingredients reach the intestines. This is especially meaningful because at higher single doses (above 1 g), absorption can fall to about 50% or less. By releasing Vitamin C gradually, these tablets help your body make the most of each serving.

The formula goes beyond ascorbic acid alone. It's blended with a base of Rose hips extract, acerola fruit extract, Rutin, Lemon bioflavonoids, and Hesperidin complex — all naturally occurring compounds that complement and support Vitamin C's activity. The result is a completely natural product with no sugar, starch, artificial colorings, or flavorings, and it's both vegan and non-GMO.

If you have questions about whether Vitamin C tablets are right for your wellness goals, our naturopath is available for a free consultation — no appointment pressure, no strings attached.

Why It Matters

How Vitamin C Supports Your Body

Vitamin C is far more than an immune nutrient — it's a foundational player across multiple body systems. As a potent water-soluble antioxidant, it fights free radicals by scavenging reactive oxygen species in aqueous cellular compartments and plasma. Research suggests it can also regenerate the antioxidant form of vitamin E, extending antioxidant protection to cell membranes.

One of Vitamin C's best-known roles is in collagen biosynthesis. It serves as an essential cofactor for prolyl and lysyl hydroxylase enzymes, which are required for the proper folding and deposition of collagen — the most abundant protein in the human body. Without adequate Vitamin C, these enzymes cannot function, which is the biochemical basis behind the connective tissue breakdown seen in scurvy.

Vitamin C also supports the immune system in both its innate and adaptive branches. Studies show it helps maintain epithelial barrier function against pathogens, enhances the differentiation and proliferation of B cells and T cells, supports phagocytosis, normalizes cytokine production, and decreases histamine levels. A large Cochrane review of over 11,000 participants found that while regular Vitamin C supplementation does not prevent colds in the general population, it modestly reduces cold duration by about 8% in adults and 14% in children.

Beyond immunity and antioxidant defense, Vitamin C enhances iron absorption from plant-based foods by reducing ferric iron to its more absorbable ferrous form — a meaningful benefit for those relying on non-heme iron sources. It's also involved in the production of adrenal steroids, catecholamines, carnitine synthesis, and amino acid metabolism.

What's inside

Key Ingredients

Vitamin C (ascorbic acid) — 1,000 mg
Vitamin C is a water-soluble essential nutrient that the body cannot synthesize on its own. It functions as a potent antioxidant, directly scavenging reactive oxygen species in plasma and aqueous cellular compartments while also regenerating the antioxidant form of vitamin E. As an enzymatic cofactor, it is essential for collagen biosynthesis — without adequate Vitamin C, prolyl and lysyl hydroxylase enzymes cannot properly hydroxylate collagen precursors, leading to structurally defective collagen. Research supports its role across numerous body systems: a Cochrane review of 29 trials (over 11,000 participants) found regular supplementation modestly reduces common cold duration by 8% in adults and 14% in children, with stronger benefits in populations under severe physical stress. Studies suggest it supports bronchial health, with supplementation at 400 mg/day or more showing improved lung function in COPD patients. It contributes to immune defense by supporting epithelial barrier function, enhancing phagocytosis, normalizing cytokine production, and decreasing histamine levels. Research also suggests it plays roles in post-illness recovery, seasonal respiratory health, and post-viral fatigue — a 2021 systematic review found high-dose IV Vitamin C significantly reduced fatigue scores in controlled trials. Its ability to enhance non-heme iron absorption by reducing ferric iron to ferrous iron in the gut makes it clinically relevant for supporting iron status.
Rose hips — 25 mg
Rose hips are the pseudo fruits of Rosa canina L. and have been used in herbal medicine for more than 2,000 years. They are one of the richest natural sources of Vitamin C, with concentrations documented up to 1,300 mg per 100 g depending on the source. Beyond Vitamin C, Rose hips contain polyphenols, carotenoids (lycopene, beta-carotene), tocopherols, flavonoids, and a unique galactolipid called GOPO that has demonstrated anti-inflammatory properties. Rose hip extract ranks among the highest measured antioxidant activities in tested fruits by multiple assay methods, and clinical studies confirm increased antioxidant status in healthy adults following supplementation. Research suggests that the Vitamin C in Rose hips supports cold and flu recovery — meta-analyses show an 8–14% reduction in cold duration in adults. A double-blind RCT found rose hip powder reduced skin aging markers including wrinkle depth and improved moisture and elasticity in healthy middle-aged adults. Historically, Rose hips were used as a febrifuge in European folk medicine and as a recovery tonic after illness in traditional German herbal practice. They were also traditionally prepared as teas and syrups to soothe sore throats and upper respiratory irritation.
acerola fruit extract — 25 mg
Acerola (related to the Cherry family) is included for its rich content of anthocyanins and other polyphenolic compounds that contribute potent antioxidant activity. Research suggests these compounds upregulate endogenous antioxidant pathways, including Nrf2/ARE, and human RCTs show increased DNA repair enzyme activity and reduced oxidative stress markers following supplementation with Cherry-family extracts. Studies also indicate that the anthocyanins modulate immune-inflammatory signaling by inhibiting COX-1/2 and NF-κB pathways, reducing pro-inflammatory cytokines such as TNF-α, IL-1β, and IL-6 in human studies. RCTs demonstrate reduced C-reactive protein levels, reflecting immune system modulation that complements the Vitamin C in this formula.
Rutin — 25 mg
Rutin (quercetin-3-O-rutinoside) is a flavonoid glycoside found naturally in buckwheat, citrus fruits, and many plants. Its biological activities are attributed to four hydroxyl groups and a rutinose molecule in its structure. Rutin is well-documented as an antioxidant through multiple mechanisms: 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. Research suggests Rutin modulates multiple arms of immunity — it suppresses pro-inflammatory cytokine production from human macrophages, inhibits mast cell activation relevant to allergic immunity, and exerts NF-κB-dependent immunomodulatory effects. It has also been studied for its role in supporting vascular health, strengthening capillary walls and reducing their permeability and fragility. Rutin has garnered attention in neuroprotection research for its antioxidant, anti-inflammatory, and anti-amyloid mechanisms in preclinical Alzheimer's models.
Hesperidin bioflavonoid extract — 25 mg
Hesperidin is a flavanone glycoside predominantly found in citrus fruits, especially sweet oranges and lemons. After ingestion, it is hydrolyzed by gut microflora into its active aglycone form, hesperetin. Research recognizes Hesperidin 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. Studies suggest Hesperidin modulates the immune system by downregulating pro-inflammatory cytokines (TNF-α, IL-1β, IL-6) and upregulating anti-inflammatory IL-10, while inhibiting NF-κB. A human RCT showed a Hesperidin-containing supplement improved immune function and enhanced the oxidative-inflammatory state in adults. Preclinical research indicates Hesperidin suppresses allergic airway inflammation through mast cell stabilization and eosinophil suppression. It has also been associated with cardiovascular support through its role in endothelial protection and anti-inflammatory effects on adhesion molecules.
Lemon bioflavonoid extract — 25 mg
Lemon bioflavonoids are a complex of flavonoids naturally present in Lemon peel and juice, including eriocitrin, Hesperidin, and naringenin. Lemon is a well-characterized source of both Vitamin C and these flavonoids, with documented antioxidant capacity in human studies — a double-blind RCT found citrus extract combined with Vitamin C significantly increased lipoprotein oxidation lag time, outperforming vitamin E as an antioxidant. The Vitamin C content in Lemon supports immune defense against respiratory infections; a Swiss clinical review found Vitamin C intake improved symptoms and shortened the duration of respiratory tract infections. Hesperidin from Lemon has computational and in vitro evidence of antiviral activity relevant to immune defense. Traditionally, Lemon has been used across cultures for immune support and as a remedy for sore throats and cold-season complaints.
dicalcium phosphate
Dicalcium phosphate serves as a tableting agent and contributes a small amount of Calcium — the most abundant mineral in the human body. More than 99% of the body's Calcium is stored in bones and teeth as hydroxyapatite. Calcium participates in muscle contraction, neuronal transmission, cell signaling, and hormone secretion. In this formula, dicalcium phosphate provides structural integrity to the tablet while contributing to the mineral profile.
Vitamin C (1000 mg, Time Release)
Vitamin C (1000 mg, Time Release)
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Vitamin C (1000 mg, Time Release)
Vitamin C (1000 mg, Time Release)
$47.65
Who Benefits

Who Should Consider Vitamin C Tablets

These Vitamin C tablets are formulated for adults looking for everyday immune support — particularly during cold and flu season or periods of increased physical or environmental stress. Research shows that populations under heavy physical stress, such as marathon runners and military personnel, may see the greatest benefit from regular Vitamin C supplementation.

They're also a thoughtful choice for anyone seeking antioxidant defense against oxidative stress, or those wanting to support healthy collagen production for skin, connective tissue, and wound healing. Because Vitamin C enhances non-heme iron absorption, these tablets may be especially beneficial for individuals who follow plant-based diets.

The time release format makes this formula well-suited for people who prefer steady nutrient delivery rather than a single large dose. Since absorption of Vitamin C falls to about 50% or less at doses above 1 g taken all at once, the gradual release may help optimize how much your body actually uses.

This product is vegan and non-GMO, making it accessible for a wide range of dietary preferences. If you're unsure whether these Vitamin C tablets fit your specific needs, our naturopath offers free consultations to help you make an informed choice.

Usage

How to Take These Vitamin C Tablets

Take one tablet daily with a meal. That's it — simple and straightforward.

Taking your tablet with food supports absorption and is gentle on the stomach. The time release coating is designed to slow the release of nutrients until they reach the intestines, allowing for sustained delivery throughout the day.

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

About the author

Written by Greg Howlett

GH

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

What makes time release Vitamin C tablets different from regular Vitamin C?

These tablets feature a special coating that slows the absorption of nutrients until they reach the intestines, allowing Vitamin C to be released gradually throughout the day rather than all at once. This is significant because research shows that absorption of Vitamin C can fall to about 50% or less at single doses above 1 g. The time release format is designed to help your body make the most of each serving.

Can Vitamin C tablets help prevent the common cold?

A large Cochrane review of 29 trials involving over 11,000 participants found that regular Vitamin C supplementation does not prevent colds in the general population. However, the same body of evidence shows it modestly reduces cold duration — by about 8% in adults and 14% in children — and may reduce symptom severity. People exposed to severe physical stress, such as marathon runners, may see greater preventive benefits.

Why are Rose hips and bioflavonoids included alongside Vitamin C?

The Vitamin C in this formula is blended with a base of Rose hips extract, acerola extract, Rutin, Lemon bioflavonoids, and Hesperidin complex. Rose hips are one of the richest natural sources of Vitamin C and contain additional antioxidant compounds including polyphenols and carotenoids. The bioflavonoids — Rutin, Hesperidin, and Lemon bioflavonoid extract — are naturally occurring plant compounds with documented antioxidant and anti-inflammatory properties that complement Vitamin C's activity.

Are these Vitamin C tablets suitable for vegans?

Yes. This product is both vegan and non-GMO. It is a completely natural product with no sugar, starch, artificial colorings, or flavorings.

How much Vitamin C is too much?

The Institute of Medicine has set the Tolerable Upper Intake Level (UL) for adults at 2,000 mg per day. Amounts above this level may lead to gastrointestinal upset and diarrhea, and rarely, may increase the risk of kidney stones — particularly in individuals who already have risk factors. This product provides 1,000 mg per tablet at the recommended one-tablet-per-day serving, well within the established upper limit.

Does Vitamin C help with iron absorption?

Yes. Vitamin C improves the absorption of non-heme iron (the form found in plant-based foods) by reducing ferric iron to its more absorbable ferrous form in the gastrointestinal tract. This makes Vitamin C tablets a helpful complement for individuals who rely primarily on plant sources of iron.

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