NOW Foods
Vitamin C-1000 Sustained Release Tablets


90/100
SUPPIE SCORE
84/100
EFFICACY
High
SAFETY
94/100
CLEANLINESS
What Does Vitamin C-1000 Sustained Release Tablets Do?
This supplement delivers a high daily dose of ascorbic acid with rose hips formulated for gradual release to support immune function and collagen synthesis.
Why choose sustained-release vitamin C instead of regular ascorbic acid?
Can taking 1,000 mg of vitamin C cause stomach discomfort or kidney stones?
Is it better to take this sustained-release tablet with a meal?
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What Are the Benefits of Vitamin C-1000 Sustained Release Tablets?
Based on proven scientific research
Antioxidant ProtectionVery strong
Immune SupportStrong
Collagen SynthesisStrong
Iron AbsorptionStrong
Good For:
What Are the Side Effects of NOW Foods Vitamin C-1000 Sustained Release Tablets?
Always consult your health practitioner if in doubt.
RiskLow Risk
Overview
•At 1,000 mg per serving, this formula provides half of the adult tolerable upper intake level (2,000 mg/day), remaining within established intake bounds.
•Mild gastrointestinal symptoms such as loose stools, abdominal cramping, or heartburn can occur, though sustained release may moderate stomach upset.
•Excess ascorbic acid is metabolized to oxalate; individuals with a history of calcium oxalate kidney stones or renal impairment face stone formation risks.
•High-dose vitamin C can interfere with blood glucose monitors, urine glucose test strips, and stool occult blood tests, potentially producing inaccurate readings.
•High oral intakes enhance non-heme iron absorption, which warrants caution in individuals with hemochromatosis or other iron overload disorders.
Potential Side Effects
Negative Interactions
Inactive Ingredients
Cellulose
Low RiskMagnesium stearate (vegetable source)
Low RiskVegetable coating
Low RiskWhat Are the Ingredients in NOW Foods Vitamin C-1000 Sustained Release Tablets?
Vitamin C (as Ascorbic Acid)
1 g (1,000 mg)
Rose Hips Powder (Rosa canina) (Fruit)
25 mg
Cellulose
Magnesium Stearate (vegetable source)
Vegetable Coating
Dosage & Bioavailability
How the active doses and forms in Vitamin C-1000 Sustained Release Tablets compare to the research.
•Vitamin C (as Ascorbic Acid) — 1,000 mg a day; within the 200-3,000 mg/day used in studies.
•Rose Hips Powder (Rosa canina) (Fruit) — 25 mg a day; studies use 5-40 g/day.
Frequently Asked Questions
Common questions about NOW Foods Vitamin C-1000 Sustained Release Tablets