Best Vitamin C Supplements 2026: Cost per Effective Dose
Top pick for Vitamin C: Nature Made Vitamin C 1000 mg Extra Strength — 1000mg per 1 tablet, USP Verified, $0.08/day. Our best-value pick.
All Vitamin C Supplements Compared
All 4 products sorted by cost per clinically-effective daily dose (lowest first). Dose, certification, and pricing verified against NIH DSLD and manufacturer data.
| Product | Brand | Dose / Serving | Cost / Day | Certification | Pick | Buy |
|---|---|---|---|---|---|---|
| NOW Foods Vitamin C-1000 with Bioflavonoids | NOW Foods | 1000mg / 1 capsule | $0.07 | None | Budget Pick | Buy |
| Nature's Bounty Vitamin C 1000 mg Caplets | Nature's Bounty | 1000mg / 1 caplet | $0.07 | None | Buy | |
| Nature Made Vitamin C 1000 mg Extra Strength | Nature Made | 1000mg / 1 tablet | $0.08 | USP Verified | Best Value | Buy |
| Thorne Vitamin C with Flavonoids | Thorne | 500mg / 1 capsule | $0.51 | NSF Certified for Sport | Quality Pick | Buy |
In-Depth Vitamin C Guides
Go deeper on vitamin c — by goal, by form, and what the evidence actually supports:
Our Picks
Best Value: Nature Made Vitamin C 1000 mg Extra Strength
1000mg per 1 tablet. USP Verified. $0.08/day. 100 servings per container at $8.69.
Quality Pick: Thorne Vitamin C with Flavonoids
500mg per 1 capsule. NSF Certified for Sport. $0.51/day. 90 servings per container at $23.00.
Budget Pick: NOW Foods Vitamin C-1000 with Bioflavonoids
1000mg per 1 capsule. $0.07/day. 250 servings per container at $18.50.
How We Rank Vitamin C Supplements
Every product is evaluated on three criteria:
- Cost per day. Not cost per pill or cost per bottle — what it actually costs per day at the product's labelled serving. Where a category's servings differ in strength we flag it above the table, because cost per day is only comparable when the doses are.
- Third-party certification. USP Verified, NSF Certified for Sport, and ConsumerLab Approved indicate independent testing for purity, potency, and contaminants.
- Bioavailable form. We prioritize products using the specific chemical form shown to be most effective in published research.
Rankings are not influenced by affiliate commissions. We earn the same commission regardless of which product you choose. Read our full methodology.
Personalize Your Vitamin C Choice
Not sure which vitamin c supplement is right for you? Use our free tools:
- DNA Supplement Analyzer — upload 23andMe or AncestryDNA data to check for genetic variants affecting vitamin c metabolism. Runs entirely in your browser.
- Lab Results Interpreter — enter your blood test values to get personalized dosing recommendations.
- Supplement Stack Builder — build a complete protocol based on your age, sex, medications, and goals.
- Supplement Audit — already taking vitamin c? Check if you have the right form and dose.