This is an adult product. Follow the manufacturer's advice to consult a clinician during pregnancy or breastfeeding. High vitamin C intakes can cause diarrhea, nausea and stomach cramps. Check with your clinician before use if you take medication or have a medical condition, particularly kidney disease, a history of kidney stones or hemochromatosis (iron overload). Kidney-stone risk depends on individual circumstances, with particular concern for people with kidney disorders or hyperoxaluria (high oxalate in urine).
The 250-tablet bottle covered here is SKU 0687, UPC 733739006875. NOW's product listing gives 250 one-tablet servings and lists microcrystalline cellulose, vegetarian coating and magnesium stearate as the other ingredients.
The similar names can make comparison confusing. NOW's sustained-release C-1000 tablet is a different product, SKU 0682, and its capsule with 100 mg of bioflavonoids is not this formula either. If you are choosing between this ascorbic acid tablet and a buffered form, see buffered vitamin C vs ascorbic acid for the differences in acidity, minerals and tolerance.
How the dose compares with daily needs
For most adults, NIH lists a recommended dietary allowance of 75 mg a day for women and 90 mg for men. These amounts describe total daily intake, not an amount everyone needs to take as a supplement. A 1,000 mg tablet is substantially above either figure.
The adult upper limit is 2,000 mg a day from all sources. One tablet supplies half that limit before you count food, drinks or other supplements. Check any multivitamin, vitamin C gummy or other supplement you use when adding up your intake. The upper limit is a ceiling, not a target.
NOW's directions are one tablet daily. Those are manufacturer directions, not proof that every adult needs that dose. For questions about meals and scheduling, see when to take vitamin C.
What the cold evidence shows
According to NIH's evidence summary, regular vitamin C supplementation does not reduce cold incidence in the general population. Studies have found small differences in cold duration, but those findings are not a guarantee that this tablet will prevent or treat a cold. They concern vitamin C supplementation, not a clinical trial of this exact NOW formula.
Price and the 250-tablet bottle
The matched HerbsPro listing was $17.86 for 250 tablets on October 15, 2026. That works out to about $0.0714 per one-tablet serving, or 7.1 cents, before tax and shipping.
The large bottle offers value only if the dose and form fit your needs. A low price per tablet is not a reason to take more vitamin C than you need, and it does not make this product a cheaper treatment for a cold.
Our editorial assessment
Supplement Explained Score
68/100
Five equally weighted criteria. This is an editorial assessment, not customer stars or a measure of medical effectiveness.
Label clarity 5/5
The 250-tablet UPC identifies 1,000 mg ascorbic acid plus the two 25 mg companion ingredients; capsule and sustained-release formulas are kept separate.
Research relevance 3/5
Vitamin C has established nutrient roles, but a 1 g tablet and added rose hips/bioflavonoids do not establish extra immune protection or a cold cure for an adequately nourished reader.
Safety and cautions 3/5
A 1 g amount can cause gastrointestinal effects and needs total-intake context, with extra caution for relevant kidney-stone, renal and iron-overload conditions.
Testing and quality checks 2/5
The reviewed sources do not include independently matched finished-lot potency and contaminant documentation; manufacturing claims are not substituted for that evidence.
Value for money 4/5
The $17.86/250 offer is about $0.071 per label tablet. The unit cost is clear, but a large bottle is not useful value if the amount or format does not fit.
Evaluated from the published Supplement Facts panel, third-party certification records, and clinical references cited below. Unlisted third-party testing lowers the verification score but does not imply contamination.
