Why Two-Stage Release Matters: The "Transporter Overflow" Problem Explained

If you take a conventional 1,000 mg vitamin C tablet all at once, your body cannot absorb most of it. Human intestines rely on specialized protein gateways called Sodium-Dependent Vitamin C Transporters (SVCT1). Groundbreaking pharmacokinetic research published by the National Institutes of Health (Levine et al., PNAS) proved that these cellular gateways become saturated at single doses over 200 mg to 400 mg. Any excess ascorbic acid is quickly excreted through your kidneys into your urine.

Solaray's custom two-stage timed-release formulation works in harmony with your digestive biology:

Instant 500 mg Infusion

Half of the capsule breaks down immediately in the upper stomach, flooding tissues and white blood cells with fresh vitamin C right when you need an energy and immune lift.

Sustained 500 mg Drip-Feed

The remaining 500 mg is micro-encapsulated to release slowly as it travels down the intestinal tract. This prevents receptor saturation, maximizes cellular uptake, and sustains continuous antioxidant defense all day long.

Enhanced with Nature's Co-Factors: Rose Hips and Acerola Cherry

In nature, vitamin C never appears as an isolated molecule. In citrus fruits and berries, ascorbic acid is surrounded by a complex web of bioflavonoids, polyphenols, and plant nutrients that protect the molecule from oxidation and help human tissues recognize and absorb it.

Rose Hips (Rosa canina)

The nutrient-dense fruit left behind after wild roses lose their petals. Rich in naturally occurring bioflavonoids, carotenoids, and proanthocyanidins, rose hips strengthen capillary walls, promote healthy circulation, and protect ascorbic acid from pre-mature breakdown.

Acerola Cherry (Malpighia glabra)

One of the planet's most potent botanical sources of native vitamin C, containing up to 30 times more concentrated ascorbate than an orange. Acerola provides rutin, quercetin, and anthocyanins that provide broad-spectrum free-radical defense for your cells.

Evidence-Based Benefits: What Vitamin C Does in Your Body

Unlike animals that synthesize vitamin C directly in their livers, humans lack the L-gulonolactone oxidase enzyme needed to produce it. You must obtain it daily through diet or high-quality supplementation. Clinical trials confirm that maintaining optimal ascorbate levels powers four vital bodily systems:

Immune Cell Fuel & White Blood Cell Defense

Your white blood cells (phagocytes and T-lymphocytes) actively accumulate up to 80 times more vitamin C than the surrounding bloodstream. They burn this vitamin as fuel to hunt foreign invaders and neutralize reactive oxidants generated during immune responses (Carr & Maggini, Nutrients, 2017).

Collagen Production for Skin, Joints & Arteries

Vitamin C is the indispensable biochemical cofactor for prolyl and lysyl hydroxylase—the enzymes responsible for stabilizing the triple-helix structure of human collagen. Regular intake keeps skin smooth and resilient while maintaining sturdy cartilage and arterial walls (Pullar et al., Nutrients, 2017).

Cellular Protection & Vitamin E Recycling

Environmental pollutants, UV light, everyday stress, and metabolic energy production generate damaging free radicals. Vitamin C donates electrons to neutralize these reactive molecules. It even re-charges oxidized vitamin E back into its active form to protect your cell membranes.

Significantly Enhances Non-Heme Iron Uptake

Plant-based non-heme iron is notoriously difficult for the gut to absorb. Vitamin C reduces ferric iron (Fe3+) into soluble ferrous iron (Fe2+) in the stomach, dramatically boosting iron uptake and supporting healthy hemoglobin and energy levels (Lynch & Cook, Annals of NY Acad Sci).

Complete Supplement Facts & Verified Ingredient Profile

Formula transparency you can trust. No hidden proprietary fillers, no synthetic dyes, and 100% plant-based components.

Supplement Facts

Detailed Ingredients & Excipient Breakdown:

• Active Nutrients: Vitamin C (USP-grade Ascorbic Acid enriched with pure natural Rose Hips and Acerola Cherry powder).
• Vegetable Cellulose Capsule: 100% plant-derived capsule shell made from natural plant wood fiber (hypromellose). Completely free of animal gelatin.
• Cellulose: Natural plant-derived bulk fiber that ensures uniform dispersal of timed-release micro-beads.
• Magnesium Stearate & Stearic Acid: Plant-based flow agents that ensure clean, uniform tablet compression without sticking to machinery.
• Silica: Natural mineral compound that preserves capsule freshness by protecting against airborne moisture.

Recommended Directions, Safety Guidelines & Health Precautions

Because this formula releases 50% immediately and 50% over 12 hours, taking it consistently at the optimal time helps you maintain stable immune and collagen support around the clock.

Directions for Daily Use:

Take 1 VegCap daily with a meal and a full 8 oz glass of water. Taking vitamin C alongside food buffers natural stomach acidity and enhances the absorption of dietary iron. If you have higher immune demands or intense physical stress, consult your healthcare practitioner regarding taking one capsule in the morning and one in the evening.

Important Health & Medication Considerations:

Tolerable Upper Limit (UL): The National Institutes of Health (NIH) Office of Dietary Supplements sets the adult upper intake level at 2,000 mg per day. Excessive mega-dosing over 2,000 mg can lead to loose stools, osmotic cramps, or gas.

Kidney Stones & Oxalate Sensitivity: The body metabolizes a portion of unused vitamin C into oxalate. Individuals with a history of recurrent calcium oxalate kidney stones or severe chronic renal impairment should consult their nephrologist before taking supplemental doses of 1,000 mg or higher.

Iron Storage Conditions (Hemochromatosis): Because vitamin C significantly boosts iron absorption, individuals diagnosed with hemochromatosis, thalassemia, or related iron overload disorders should monitor their supplemental intake closely.

Medication Interactions: High-dose ascorbic acid may interact with blood-thinning agents (warfarin), statins, niacin, and certain chemotherapy regimens. Always keep your prescribing physician informed of any dietary supplements you take.

Authoritative Scientific References & Clinical Studies

1. Levine M, Conry-Cantilena C, Wang Y, et al. (1996). "Vitamin C pharmacokinetics in healthy volunteers: Evidence for a recommended dietary allowance." Proceedings of the National Academy of Sciences (PNAS), 93(8): 3704–3709. [Demonstrates saturable SVCT1 kinetics and the therapeutic rationale for timed-release delivery].
2. Carr AC, Maggini S. (2017). "Vitamin C and Immune Function." Nutrients, 9(11): 1211. [Documents the high concentration of ascorbate in circulating neutrophils, cellular motility, and infection defense].
3. Pullar JM, Carr AC, Vissers MCM. (2017). "The Roles of Vitamin C in Skin Health." Nutrients, 9(8): 866. [Analyzes ascorbic acid's required role in proline and lysine hydroxylation during collagen cross-linking].
4. Hemilä H, Chalker E. (2013). "Vitamin C for preventing and treating the common cold." Cochrane Database of Systematic Reviews, 2013(1): CD000980. [Systematic review showing consistent reductions in respiratory episode duration and physical stress recovery].
5. National Institutes of Health (NIH) Office of Dietary Supplements. (Updated 2021). "Vitamin C: Fact Sheet for Health Professionals." National Institutes of Health, Bethesda, MD. [Establishes RDA, clinical bioavailability ranges, and 2,000 mg/day adult Tolerable Upper Intake Levels].

Frequently Asked Questions About Solaray C-1000 Two-Stage Timed Release

1. How does Solaray's Two-Stage Timed Release differ from standard Vitamin C?

Conventional vitamin C tablets dump their entire payload of ascorbic acid into your stomach all at once. Because your gut can only absorb a small amount before its transporter proteins become saturated, the rest is quickly excreted in urine. Solaray's Two-Stage technology releases 50% immediately to give you rapid protection, and releases the other 50% slowly over up to 12 hours. This provides sustained plasma levels without receptor overload or waste.

2. Why are Rose Hips and Acerola Cherry included in this formula?

Rose Hips and Acerola Cherry are two of the richest whole-food botanical sources of vitamin C. They provide natural bioflavonoids, rutin, and hesperidin. These plant compounds mirror how vitamin C occurs in fresh citrus, working synergistically with ascorbic acid to enhance cellular absorption and deliver superior antioxidant protection.

3. Is this supplement gentle on a sensitive stomach?

Yes. Large, unbuffered, single-dose ascorbic acid tablets can cause gastric irritation, acid reflux, or mild digestive cramping in sensitive individuals. Because Solaray micro-encapsulates half of the dose to disperse gradually down the intestinal tract over hours, it avoids sudden acid concentrations in your stomach.

4. When is the best time of day to take Solaray C-1000 Timed Release?

The best time is in the morning with breakfast and an 8 oz glass of water. Taking it with a meal buffers stomach acids and improves your absorption of non-heme iron from breakfast foods. The 12-hour sustained-release matrix ensures your tissues remain nourished through your workday and into the evening.

5. Can I take more than one VegCap per day?

One VegCap provides 1,000 mg (1,111% DV), which is more than sufficient for everyday immune and collagen support. While the adult Tolerable Upper Intake Level established by medical authorities is 2,000 mg per day, you should consult your healthcare practitioner before taking multiple capsules daily.

6. Are these capsules 100% vegan and gluten-free?

Yes. Solaray uses 100% plant-cellulose VegCaps without animal gelatin, wheat, gluten, soy, dairy, eggs, artificial sweeteners, or preservatives. Every batch is rigorously tested in Solaray's ISO-certified quality lab to ensure purity and identity.