Vitamin C

Description

Vitamin C (L-ascorbic acid) is a crucial water-soluble vitamin that humans cannot synthesize endogenously, making dietary intake essential. It plays a fundamental role in numerous physiological processes, acting as a potent antioxidant that helps protect cells from damage caused by free radicals. This protective action is vital for overall cellular health and can contribute to reducing oxidative stress throughout the body. Beyond its antioxidant capacity, Vitamin C is indispensable for the biosynthesis of collagen, a primary structural protein found in connective tissues, skin, bones, and blood vessels. This makes it critical for wound healing, maintaining skin integrity, and supporting healthy joints. Additionally, it is involved in the metabolism of proteins, the synthesis of neurotransmitters, and the absorption of iron, highlighting its diverse and widespread importance in bodily functions. A well-known benefit of Vitamin C is its significant role in supporting the immune system. It enhances various immune cell functions, including phagocytes and T-cells, and aids in the production of antibodies. Deficiency can lead to scurvy, characterized by fatigue, gum inflammation, and poor wound healing, underscoring the necessity of adequate intake for maintaining robust health.

Sources
Citrus fruits (oranges, grapefruits, lemons)Berries (strawberries, blueberries, raspberries)KiwiBell peppers (especially red and yellow)BroccoliKaleSpinachTomatoesAcerola cherries
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Timing & Intake
AnytimeWith foodTake with Iron (to enhance absorption), Bioflavonoids
Can be taken with or without food, but taking with food may reduce gastrointestinal upset in some individuals. Splitting doses throughout the day can also optimize absorption due to its water-soluble nature.
Daily Intake
RDA (Men)90 mg
RDA (Women)75 mg
RDI90 mg
Optimal Dosage
Minimum250 mg
Maximum1000 mg
Safety & Toxicity
Upper Limit (UL)2000 mg
Toxicity Threshold3000 mg
Toxicity Effectdiarrhea, kidney stones
Goals
Immunity
Immunity
Impact
Highest effect
Typical dose:500–2000 mg
Vitamin C contributes to immune defense by supporting epithelial barrier function against pathogens and enhancing the activity of immune cells like phagocytes and T-cells. Its antioxidant properties also protect these cells from damage during the high oxidative stress of an infection.
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Skin Health
Skin Health
Impact
Highest effect
Typical dose:250–1000 mg
The body cannot produce collagen without adequate Vitamin C, making it foundational for skin strength and repair. As a potent antioxidant, it neutralizes free radicals generated by sun exposure and pollution, working synergistically with Vitamin E to protect skin integrity.
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Vision Support
Vision Support
Impact
Highest effect
Typical dose:250–1000 mg
The eye's lens and aqueous humor have very high concentrations of Vitamin C to combat oxidative stress from UV light. Studies, including the AREDS trials, show that Vitamin C, as part of an antioxidant cocktail, can slow the progression of AMD and may reduce the risk of cataract formation.
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Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
High effect
Typical dose:500–2000 mg
Vitamin C is essential for mitigating oxidative stress caused by the inflammatory process itself. It directly neutralizes damaging free radicals and is required to regenerate other critical antioxidants like Vitamin E, providing broad-spectrum support against the drivers of chronic inflammation.
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Bone Health
Bone Health
Impact
High effect
Typical dose:250–1000 mg
Vitamin C's role in collagen synthesis is fundamental, not situational. It is required for enzymes that stabilize the collagen structure, directly impacting the tensile strength and integrity of the bone matrix. Without adequate Vitamin C, the collagen foundation of bone is compromised, making it more brittle.
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Product stats
Price per product
Average$23.34
Median$18.89
Price per serving
Average$0.56
Median$0.43
Price per 1000 mg
Average$0.48
Median$0.27
Price distribution
Price per serving distribution
Price per 1000 mg
Reference amount: 1000 mg
Forms
Paired ingredients
Ingredient forms
Ascorbic Acid (623)85
Ascorbic acid is the chemical name for Vitamin C and represents its purest, most fundamental form. It is a water-soluble vitamin crucial for collagen synthesis, immune function, iron absorption, and acts as a powerful antioxidant protecting cells from free radical damage.
Pros
  • Highly effective and bioavailable
  • Most researched form of Vitamin C
  • Potent antioxidant
  • Widely available and cost-effective
Cons
  • Can be acidic, potentially causing digestive upset or tooth enamel erosion in sensitive individuals
  • Short half-life in the body
Per product
Avg$28.97
Med$23.24
Per serving
Avg$0.75
Med$0.62
Per 100 mg
Avg$0.21
Med$0.12
Price distribution
Calcium Ascorbate (149)90
Calcium ascorbate is a mineral ascorbate, formed by binding ascorbic acid to calcium. This process neutralizes the acidity of Vitamin C, making it significantly less likely to cause gastrointestinal discomfort. It provides both the benefits of Vitamin C and a small amount of elemental calcium, making it a good choice for those with sensitive stomachs or seeking mild calcium supplementation.
Pros
  • Non-acidic and gentle on the stomach
  • Good bioavailability and absorption
  • Provides a supplemental source of calcium
  • Suitable for individuals sensitive to regular ascorbic acid
Cons
  • Contains calcium, which may be a consideration for those monitoring calcium intake or with specific medical conditions
  • Slightly lower Vitamin C content by weight compared to pure ascorbic acid
Per product
Avg$30.53
Med$26.37
Per serving
Avg$0.67
Med$0.54
Per 100 mg
Avg$0.15
Med$0.11
Price distribution
Sodium Ascorbate (84)88
Sodium ascorbate is a mineral salt of ascorbic acid, which buffers the Vitamin C to a neutral pH. This makes it a preferred option for individuals who experience gastrointestinal upset or discomfort from the acidity of regular ascorbic acid. It is highly soluble and easily absorbed, providing all the benefits of Vitamin C while also contributing a small amount of sodium.
Pros
  • Non-acidic and gentle on the stomach
  • Highly soluble and bioavailable
  • Suitable for sensitive individuals
Cons
  • Contains sodium, which should be considered by individuals on sodium-restricted diets
  • Slightly lower Vitamin C content by weight compared to pure ascorbic acid
Per product
Avg$20.06
Med$15.58
Per serving
Avg$0.53
Med$0.35
Per 1000 mg
Avg$0.41
Med$0.25
Price distribution
L-Ascorbic Acid (61)85
L-Ascorbic Acid is simply the specific stereoisomer of ascorbic acid that is naturally found in foods and is biologically active in the human body. It is chemically identical to ascorbic acid and offers all the same powerful benefits, including its role as a potent antioxidant, and its essential functions in collagen formation and immune system support.
Pros
  • The natural and biologically active form of Vitamin C
  • Highly effective and well-researched
  • Potent antioxidant
Cons
  • Same potential acidity and digestive issues as Ascorbic Acid for sensitive individuals
  • Relatively short half-life in the body
Per product
Avg$24.75
Med$21.09
Per serving
Avg$0.44
Med$0.21
Per 100 mg
Avg$0.11
Med$0.08
Price distribution
Ascorbyl Palmitate (56)75
Ascorbyl palmitate is a fat-soluble (lipophilic) derivative of Vitamin C, created by combining ascorbic acid with palmitic acid. Unlike water-soluble forms, its fat-soluble nature allows it to be incorporated into cell membranes, potentially providing antioxidant protection in areas water-soluble Vitamin C cannot easily reach. It is often used in topical skincare products for its stability and ability to penetrate the skin, and sometimes in oral supplements for sustained antioxidant activity.
Pros
  • Fat-soluble, allowing it to penetrate cell membranes for localized antioxidant protection
  • More stable form of Vitamin C, especially in topical applications
  • May offer sustained antioxidant activity within lipid environments
Cons
  • Lower bioavailability as a dietary supplement for systemic Vitamin C levels compared to water-soluble forms
  • Less research on its systemic efficacy for general Vitamin C replenishment
  • Not primarily used for directly boosting general Vitamin C status
Per product
Avg$32.36
Med$29.35
Per serving
Avg$0.85
Med$0.72
Per 1000 mg
Avg$0.71
Med$0.66
Price distribution
Zinc Ascorbate (34)88
Zinc ascorbate is a mineral ascorbate that provides both essential Vitamin C and the trace mineral zinc in a single, well-absorbed compound. Both Vitamin C and zinc are critical for a robust immune system, wound healing, and powerful antioxidant protection. The ascorbate form ensures it is buffered and gentle on the stomach, making it an ideal choice for targeted immune support.
Pros
  • Synergistic benefits of Vitamin C and zinc, especially for immunity
  • Non-acidic and gentle on the stomach
  • Highly bioavailable form of both nutrients
  • Supports wound healing
Cons
  • Contains zinc, which can be toxic in excessively high doses or may interact with certain medications
  • Slightly lower Vitamin C content by weight compared to pure ascorbic acid
Per product
Avg$21.25
Med$19.17
Per serving
Avg$0.75
Med$0.64
Per 1000 mg
Avg$0.56
Med$0.33
Price distribution
Ester-C Calcium Ascorbate (27)92
Ester-C is a brand-name, patented form of Vitamin C that combines calcium ascorbate with naturally occurring Vitamin C metabolites, primarily calcium threonate. These metabolites are thought to enhance the uptake and retention of Vitamin C within the white blood cells, leading to more sustained levels in the body. It is non-acidic, gentle on the stomach, and highly bioavailable.
Pros
  • Non-acidic and gentle on the stomach, ideal for sensitive individuals
  • Enhanced absorption and longer retention of Vitamin C in the body
  • Provides a small amount of calcium
  • Less frequent dosing may be needed due to sustained action
Cons
  • Typically more expensive than standard ascorbic acid or generic buffered forms
  • Proprietary blend, making independent comparisons sometimes challenging
Per product
Avg$18.28
Med$15.44
Per serving
Avg$0.22
Med$0.18
Per 1000 mg
Avg$0.21
Med$0.20
Price distribution
Magnesium Ascorbate (27)88
Magnesium ascorbate is a mineral ascorbate that unites ascorbic acid with magnesium. This buffered compound is gentle on the digestive system, delivering all the advantages of Vitamin C alongside magnesium, a crucial mineral involved in over 300 enzymatic reactions in the body, including muscle and nerve function, blood glucose control, and blood pressure regulation, as well as bone health.
Pros
  • Non-acidic and gentle on the stomach
  • Provides beneficial magnesium, an essential mineral
  • Good bioavailability for both Vitamin C and magnesium
  • Supports muscle relaxation and nerve function
Cons
  • Contains magnesium, which may have a laxative effect in high doses
  • Slightly lower Vitamin C content by weight compared to pure ascorbic acid
Per product
Avg$37.09
Med$42.00
Per serving
Avg$0.98
Med$0.80
Per 1000 mg
Avg$0.57
Med$0.32
Price distribution
Niacinamide Ascorbate (27)70
Niacinamide ascorbate is a compound formed by chemically bonding ascorbic acid to niacinamide, a form of Vitamin B3. This innovative form delivers the antioxidant and collagen-supporting properties of Vitamin C alongside the skin-benefiting and metabolic support of niacinamide. A key advantage is that it provides niacinamide's benefits without causing the uncomfortable 'niacin flush' often associated with nicotinic acid.
Pros
  • Delivers benefits of both Vitamin C and Niacinamide
  • Non-acidic and gentle on the stomach
  • Avoids the 'niacin flush' common with other forms of Vitamin B3
Cons
  • Less common and less extensively researched as a primary Vitamin C source compared to other forms
  • Contains Vitamin B3, which might not be desired by all users
  • Potentially more expensive due to its specialized nature
Per product
Avg$34.48
Med$30.89
Per serving
Avg$0.93
Med$0.68
Per 100 mg
Avg$0.05
Med$0.04
Price distribution
Rose Hip (18)78
Rose hips are the small, reddish-orange fruits that develop after the rose flower fades. They are widely recognized as one of the richest natural plant sources of Vitamin C, often containing significantly more than oranges. Beyond Vitamin C, rose hips also provide a complex array of other beneficial compounds, including bioflavonoids, carotenoids, and other antioxidants, which are believed to enhance the absorption and efficacy of Vitamin C.
Pros
  • Natural, whole-food source of Vitamin C
  • Rich in synergistic bioflavonoids and other antioxidants
  • Generally gentle on the stomach
  • Offers additional plant-based nutrients
Cons
  • Vitamin C content can be variable depending on the source and processing
  • Generally provides lower concentration of pure Vitamin C by weight compared to isolated forms
  • May contain other plant compounds not desired by all users
Per product
Avg$25.32
Med$23.40
Per serving
Avg$0.35
Med$0.24
Per 1000 mg
Avg$0.10
Med$0.08
Price distribution