Vitamin CNHANES 2005 to 2016
About 46% of US adults
take in less vitamin C than the estimated average requirement.
Peer-reviewed analysisVitamin C 1000mg
Vitamin C 1000mg.
Backed by human trials
Vitamin C is the lead active here, studied most for filling everyday nutrient gaps. 16 human studies on Vitamin C back this formula, each one cited. Who it fits: for everyone, adults.
Clinically dosedFull label disclosure
1Active ingredient16Human studies1000 mgVitamin C
Verified by IngredientMDHow we read this product
- 01We read the label.
The panel on the left is the one we evaluated, line by line.
- 02Every active, separately.
All 1 actives checked against the clinical evidence: dose, form, and what the research actually shows.
- 03Then the formula as a whole.
Doses, ratios, and how the ingredients work together. That assessment is the verdict above: "Backed by human trials".
- 04Earned, not bought.
The verdict is public and identical whether or not a brand pays. A formula that does not clear the bar gets nothing.
Read by the engine against 2.1 million data points from clinical trials, PubMed and more than a hundred vetted sources. No individual reviewer is named or implied.
The receipts
16
Human studies
1000 mg
Vitamin C
Cross-checked against 726 documented interactions for these actives.
Read the evidenceVitamin C, the evidence →
Inside the formula
In context
The gap this formula speaks to.
Public health figures the engine matched to this formula's ingredients. Reported by their source, cited and dated, never written by the brand.
The people it speaks toFieldwork August 2023
74% of US adults
take dietary supplements, and 55% are regular users, in the Council for Responsible Nutrition's 2023 consumer survey of 3,192 adults.
Council for Responsible Nutrition and Ipsos, 2023The people it speaks toFieldwork August 2023
92% of US supplement users
agree that dietary supplements are essential to maintaining their health, in the Council for Responsible Nutrition's 2023 consumer survey.
Council for Responsible Nutrition and Ipsos, 2023The people it speaks toFieldwork 2019
12.3% of US adults
met the fruit intake recommendation and 10.0% the vegetable recommendation in 2019, in the Behavioral Risk Factor Surveillance System across 49 states.
CDC, MMWR, 2022The people it speaks toFieldwork 2017 to March 2020
15% of US adults
aged 20 and over ate no breakfast on the day of their dietary recall, in the 2017 to March 2020 What We Eat in America survey.
USDA Agricultural Research Service, 2024The people it speaks toFieldwork August 2021 to August 2023
60.2% of US adults aged 20 and over
took a dietary supplement in the past 30 days, and 38.7% took two or more, in the 2021 to 2023 National Health and Nutrition Examination Survey.
CDC National Center for Health Statistics, 20268 more
59 to 66 days
was the median time it took adults to make a new daily health habit automatic across the studies a 2024 review pooled, with individuals ranging from 4 to 335 days.
Systematic review and meta-analysis, 202461% to 74%
About 61 to 74 percent of adults refilling a long-term medicine on their own stopped within a year, versus 33 to 44 percent on one set pickup day.
Cohort study, 2015Meta-analysis, 2012
Across 29 trials, about 500 mg of vitamin C daily for 8 weeks lowered systolic pressure by about 3.8 points and diastolic by about 1.5 points versus control.
The American Journal of Clinical NutritionMeta-analysis, 2015
Across trials, vitamin C, 500 to 2000 mg daily, gave a small improvement in blood vessel function, greater in older adults, but not when combined with vitamin E.
British Journal of NutritionAshor et al., 2015 (British Journal of Nutrition)PMID 25919436
Randomised trial, 2019
In a crossover trial, 19 healthy women taking 1000 mg of ascorbic acid before a single bout of cycling showed higher antioxidant capacity readings afterward than after placebo.
Journal of the International Society of Sports NutritionMeta-analysis, 2026
A review of pooled trials found vitamin C modestly lowered blood pressure in adults.
Food & functionKosari et al., 2026 (Food & function)PMID 41784995
Meta-analysis, 2021
Across 28 mostly short trials in 1,574 adults with raised blood sugar, vitamin C lowered systolic blood pressure by about 6.3 mmHg, with a small, low-certainty 0.54 point change in a blood sugar marker.
The paperMason et al., 2021PMID 33472962
Meta-analysis, 2026
Across pooled trials, taking vitamin C was linked to better measured markers of recovery after exercise.
Clinical nutrition ESPENCandeloro et al., 2026 (Clinical nutrition ESPEN)PMID 41687812
Population figures from public health data. Context for the category, not a statement about any individual and not a claim about this product.
Every one of these is a fact the engine could ground.
Each line below was derived from this formula's own record at the time of verification. Nothing here was written by the brand, and nothing can be added that the evidence does not carry.
- Studied in people16 human studies on Vitamin C back this formula, each one cited.
- A mechanism that is settledHow Vitamin C works is settled pharmacology.
- Why this formatIt is a tablet, so the amount per serving is fixed and it stores well.
- The exact form, describedThe form on the label is Ascorbic acid. The record says what that form is and what it suits.
- Full label disclosureEvery ingredient on this label carries its own declared amount.
- Where it comes from and how it is madeVitamin C is made by fermentation.
- Positions this formula already qualifies forThis formula already qualifies for positions beyond the one it is sold into, on the evidence it carries.
- A position nobody is holding yetSome of those positions are ones almost nobody is selling to yet.
- Interaction screen on the recordEvery active on this label was screened against the interaction record, and the screen is published with it.
How each ingredient usually behaves over time.
One ingredient, from its own page.
- Vitamin CWithin hours
Plasma levels climb within hours and plateau near the top of the band. Collagen-linked changes in gums and skin show up across weeks, on examination rather than by sensation.
How each ingredient usually behaves over time, from its own page on IngredientMD. General timing for the ingredient, not a measurement of this product.
Chemical form
The same ingredient, carried differently.
What each form is, and where it fits in a formula. Measured findings carry the study that reported them.
- Ascorbic acid
The unbuffered acid, pKa around 4.2, fully water soluble and the reference form for most assays and trials.
- Fits
- Anyone matching a research dose or wanting no added mineral load.
- Trade-off
- The acidity can be noticeable in the stomach for some people at larger single doses, and it is hard on tooth enamel in chewable or powder-in-water use.
Descriptions of the form itself, read from the cited studies. Not a comparison between products and not a statement about any individual.
Tablet
It is a tablet, so the amount per serving is fixed and it stores well.
Best forHigh-dose minerals and anything needing timed or delayed release.
Questions shoppers ask
- Is Vitamin C 1000mg independently verified?
- Yes. IngredientMD reviewed this formula independently and verified it in Oct 2026. The verdict is earned, not bought: brands can't edit or purchase it.
- What's in Vitamin C 1000mg?
- Vitamin C 1000mg is built on Vitamin C. Each ingredient links to its own evidence page on IngredientMD.
- Were ingredient interactions checked?
- Yes. The combination was screened against 726 documented interactions for these actives in IngredientMD's interaction database.
- Who is IngredientMD?
- IngredientMD is an independent supplement-science platform. We analyze ingredients and formulas against clinical research, and we verify products only when they clear our bar. Labs run the tests. We review the results.
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These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This record is not medical advice. Always consult your healthcare provider before starting any supplement regimen.
Independent review by IngredientMD, not commissioned by Nature MadeWork at Nature Made? This verification is yours to claim →