C 1000 mg
21st Century
C 1000 mg
4.7
★ ★ ★ ★ ★
(27484 ratings)
Vitamin C 1000 mg
Score 80.0
A popular and effective 1000mg Vitamin C supplement, widely used for its higher dosage, though not the most cost-effective option available.
Quantity: 60 Tablet(s)Servings size: 1 Tablet(s) (60 servings)
Selected goals:
Other goals:
Immunity
General Health
Skin Health
Anti-Aging
Anti-Inflammatory Support
leaderboard Score 80.0
A popular and effective 1000mg Vitamin C supplement, widely used for its higher dosage, though not the most cost-effective option available.
Quantity: 110Dose: 500mg, Quantity: 110Dose: 500mg, Quantity: 110Dose: 500mg, Quantity: 250Dose: 500mg, Quantity: 110Dose: 1000mg, Quantity: 110
insights Analysis
This 21st Century Vitamin C 1000 mg product is incredibly popular, as evidenced by its very high review count, signifying widespread consumer satisfaction and trust. The 1000mg dosage is excellent for those seeking higher daily intake for robust immune support or intensive antioxidant benefits, making it a powerful choice for its specified goals. While effective and widely used, its price per serving of 5 cents for basic ascorbic acid is not the most competitive, especially when compared to other high-dose alternatives available in the market that may offer similar potency at a lower cost or additional benefits like buffered forms.
- Provides a robust 1000mg dosage, ideal for high-dose Vitamin C needs
- Extremely high review count indicates widespread consumer satisfaction and trust
- Price per serving is on the higher side for a basic ascorbic acid formulation
- Lacks additional benefits like buffered forms for stomach sensitivity or added bioflavonoids
$4.49($0.07 per serving)
 iHerb | $ 4.49 |
bolt Effectiveness for goals
Vitamin C contributes to immune defense by supporting various cellular functions of both the innate and adaptive immune system. It aids in the production and function of white blood cells and supports epithelial barrier function against pathogens. While essential, large doses have not been shown to significantly "boost" immunity beyond preventing deficiency.
Regular Vitamin C supplementation may slightly reduce the duration and severity of the common cold in some individuals, particularly those under extreme physical stress. However, it does not reliably prevent colds in the general population. Research indicates limited benefit for prevention in most people.
Adequate Vitamin C intake is crucial for collagen formation, which supports healthy skin, bones, and cartilage. It also plays a vital role in immune function, iron absorption, and acts as a powerful antioxidant protecting cells from damage. It is essential for general growth, development, and tissue repair.
Vitamin C is a powerful antioxidant that helps protect the skin from oxidative damage caused by UV exposure and pollutants. It is also essential for collagen synthesis, which contributes to skin structure and elasticity. Both dietary and topical Vitamin C are recognized for supporting skin health.
Yes, Vitamin C is a potent antioxidant that helps protect cells from damage caused by free radicals. These unstable molecules are generated by normal bodily processes and environmental stressors. This antioxidant function is crucial for overall cellular health and can reduce oxidative stress.
schedule Dosage, timing & forms
Ascorbic acid is the most common and widely studied form of Vitamin C. Ester-C, often calcium ascorbate, is a buffered form that may be gentler on the stomach. Liposomal Vitamin C encapsulates the nutrient in tiny fat-like spheres, which may enhance absorption and bioavailability in some cases.
The Recommended Dietary Allowance (RDA) for adult men is 90 mg per day and for adult women is 75 mg per day. Higher amounts may be recommended for smokers. These dosages are generally sufficient to prevent deficiency.
Yes, different forms can influence absorption rates. While ascorbic acid is generally well-absorbed, some forms like liposomal Vitamin C are designed to offer enhanced absorption, potentially improving bioavailability. Buffered forms like calcium ascorbate are often chosen for better tolerance, especially for sensitive individuals.
For most adult men, the recommended daily allowance (RDA) of Vitamin C is 90 mg, and for adult women, it is 75 mg. These amounts are generally sufficient to prevent deficiency and support overall health. Higher doses may be considered in specific circumstances.
The tolerable upper intake level (UL) for Vitamin C in adults is 2,000 mg (2 grams) per day. Exceeding this limit can lead to gastrointestinal side effects such as diarrhea, nausea, and abdominal cramps. This UL is set to prevent adverse effects.
health_and_safety Safety & interactions
High doses of Vitamin C may lead to digestive upset, such as diarrhea, nausea, and abdominal cramps. These effects are generally mild and more likely to occur with doses exceeding the tolerable upper intake level. Reducing the dose usually alleviates these symptoms.
The tolerable upper intake level (UL) for Vitamin C in adults is 2,000 mg per day. Consuming amounts above this UL may increase the risk of gastrointestinal disturbances like diarrhea. Exceeding this limit regularly is generally not recommended without medical supervision.
Vitamin C enhances the absorption of non-heme iron, which is found in plant-based foods and supplements. This interaction can be beneficial for individuals with low iron stores or those following vegetarian or vegan diets. Taking Vitamin C with iron supplements may improve their effectiveness.
For most healthy individuals, Vitamin C supplementation does not significantly increase the risk of kidney stones. However, individuals with a history of kidney stones or certain underlying conditions, particularly those prone to oxalate-type stones, might need to exercise caution with high doses. Vitamin C can be metabolized into oxalate, which is a component of some kidney stones.
Some older studies suggested high doses of Vitamin C might interfere with the effectiveness of certain anticoagulants like warfarin. However, more recent evidence indicates that moderate Vitamin C intake is unlikely to have a significant effect on most common blood thinners. Patients on anticoagulant therapy should discuss any supplement use with their healthcare provider.
Ingredients
| Ingredient | Amount per serving |
|---|---|
Vitamin C | 1000 mg |
Calcium | 52 mg |
Categories
Vitamin C 80.0
It's a high-potency, straightforward Vitamin C supplement. Its widespread popularity reinforces its standing within the Vitamin C collection, though it's a basic form.
Goals
Immunity 85.0
The 1000mg dosage provides strong support for immune function, making it an effective choice for daily immune bolstering and potentially beneficial during periods of higher demand.
General Health 85.0
This higher dose ensures sufficient Vitamin C for essential bodily functions, supporting overall physiological balance and antioxidant needs beyond basic requirements.
Skin Health 80.0
The ample dosage aids significantly in collagen production, which is vital for skin elasticity and integrity, and provides robust antioxidant protection against environmental stressors.
Recommended Alternatives
95 Value 
C 500 mg
21st Century
4.8
★★★★★
(31743 ratings)
While a lower dosage, its exceptionally low price per serving (2 cents) offers tremendous value for daily maintenance, potentially allowing for two servings for less than the cost of one of the original product.
92 Value 
C-500 With Rose Hips
NOW
4.9
★★★★★
(10235 ratings)
Provides 500mg with Rose Hips at an extremely low price per serving (2 cents), offering excellent value for an enhanced Vitamin C formula.
88 Value 
C-500 Calcium Ascorbate-C
NOW
4.9
★★★★★
(6730 ratings)
Offers a buffered 500mg dose at a competitive price per serving (5 cents), providing a gentler option with good value for those who prioritize stomach comfort.
88 Performance 
C 1000 mg with Rose Hips
21st Century
4.8
★★★★★
(4334 ratings)
Offers the same 1000mg dosage with the added benefit of Rose Hips, which may enhance absorption and provide additional bioflavonoid antioxidants for a more comprehensive approach.
90 Performance 
Buffered Gold C
California Gold Nutrition
4.8
★★★★★
(46051 ratings)
A buffered Vitamin C (Sodium Ascorbate) from a highly trusted brand, offering a gentler alternative for sensitive stomachs while still providing a substantial dose.
85 Performance 
Vitamin C 1000 mg Tablets
NutriBiotic Immunity
4.7
★★★★★
(1365 ratings)
Delivers 1000mg of L-Ascorbic Acid in a highly-rated formulation from a brand specializing in immunity, often preferred for its perceived purity and bioavailability.
98 Budget 
Gold C Vitamin C 1000 mg
California Gold Nutrition
4.8
★★★★★
(358411 ratings)
Offers the same 1000mg dose at a significantly lower price per serving (4 cents) from a highly reputable brand, providing a more economical high-dose option with excellent reviews.
85 Budget 
C 1000 mg
Swanson
4.8
★★★★★
(1596 ratings)
Provides a 1000mg dose at a more competitive price per serving (4 cents), offering good value for a standard high-potency Vitamin C supplement.
82 Budget 
C 1000 mg
Nature's Bounty
4.7
★★★★★
(1194 ratings)
A 1000mg option from a well-known brand, available at a lower price per serving (4 cents), making it a more affordable high-dose choice for daily needs.
95 Value
C 500 mg
21st Century
4.8
★★★★★
(31743 ratings)
While a lower dosage, its exceptionally low price per serving (2 cents) offers tremendous value for daily maintenance, potentially allowing for two servings for less than the cost of one of the original product.
92 Value
C-500 With Rose Hips
NOW
4.9
★★★★★
(10235 ratings)
Provides 500mg with Rose Hips at an extremely low price per serving (2 cents), offering excellent value for an enhanced Vitamin C formula.
88 Value
C-500 Calcium Ascorbate-C
NOW
4.9
★★★★★
(6730 ratings)
Offers a buffered 500mg dose at a competitive price per serving (5 cents), providing a gentler option with good value for those who prioritize stomach comfort.
88 Performance
C 1000 mg with Rose Hips
21st Century
4.8
★★★★★
(4334 ratings)
Offers the same 1000mg dosage with the added benefit of Rose Hips, which may enhance absorption and provide additional bioflavonoid antioxidants for a more comprehensive approach.
90 Performance
Buffered Gold C
California Gold Nutrition
4.8
★★★★★
(46051 ratings)
A buffered Vitamin C (Sodium Ascorbate) from a highly trusted brand, offering a gentler alternative for sensitive stomachs while still providing a substantial dose.
85 Performance
Vitamin C 1000 mg Tablets
NutriBiotic Immunity
4.7
★★★★★
(1365 ratings)
Delivers 1000mg of L-Ascorbic Acid in a highly-rated formulation from a brand specializing in immunity, often preferred for its perceived purity and bioavailability.