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Ester-C 24 Hour Immune Support 1000 mg

NatureSmart
4.9
★ ★ ★ ★ ★
(12656 ratings)
Vitamin C 1000 mg
Flavonoid (mixture) 102 mg
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Score95

A high-quality, non-acidic Vitamin C that provides steady support for a full 24 hours.

How scoring works
Quantity:120 Tablet(s) • (120 servings)
Goals:
Immunity
Skin Health
General Health
Anti-Inflammatory Support
Vision Support

Score 95

A high-quality, non-acidic Vitamin C that provides steady support for a full 24 hours.

How scoring works
$14.97($0.12 per serving)
Walmart
$ 14.97
iHerb
$ 16.84
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Analysis

This supplement uses the Ester-C form of Vitamin C, which is clinically known to be easy on the stomach. It also includes a bioflavonoid complex that helps the body hold onto the vitamin for a full day.

It works particularly well for those who only want to take one tablet a day but still want full-time protection. The tablets are made to be easy to digest, even on an empty stomach.

Pros

  • Lasts longer in the body than regular C
  • Won't cause stomach upset for most people
  • High 1000mg dose in just one tablet
  • Includes a citrus bioflavonoid blend

Cons

  • The tablets can be somewhat large
  • More expensive than basic ascorbic acid
  • Higher dose might not be needed by everyone

Warnings

  • Ensure you drink plenty of fluids
  • Consult a professional if you have kidney issues
  • Store in a cool, dry place

Nutrient quality

92 Highest impact

Patented Ester-C form provides superior bioavailability and long-lasting cellular support. Meaningful dosages of Vitamin C and citrus bioflavonoids address multiple pathways for antioxidant defense.

Ingredient transparency

96 Highest impact

Labeling clearly identifies the patented Vitamin C form and its accompanying bioflavonoid complex. Serving sizes and daily usage guidance are transparent and easy to interpret.

Customer satisfaction

97 Highest impact

Excellent average rating across a massive review base indicates high product reliability. User feedback strongly supports the non-acidic benefits and overall immune health results.

Value for money

96 Highest impact

High serving count and premium ingredient form provide exceptional value for the price. Cost per serving is very competitive within the buffered Vitamin C category.

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Goals

Immunity
Impact
Highest effect
A+ Goal FitA+ Strength of SupportB- CoverageA+ Formula Quality

Ester-C Calcium Ascorbate provides a highly bioavailable, non-acidic source of Vitamin C for intensive immune system support. This patented form is clinically researched for its long-lasting retention within immune cells, supporting 24-hour vigilance.

The 1,000 mg dose is expertly targeted for daily systemic support and maximal intestinal absorption. The addition of a citrus bioflavonoid complex further enhances the antioxidant utility of this gentle-on-the-stomach formulation.

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Skin Health
Impact
Highest effect
A Goal FitA+ Strength of SupportC+ CoverageA+ Formula Quality

This premium supplement delivers 1000mg of Ester-C, a patented, non-acidic form of vitamin C that is clinically researched for its long-lasting cellular retention. Vitamin C is essential for collagen synthesis and provides powerful antioxidant defense for the skin.

The addition of citrus bioflavonoids further enhances the effectiveness of the vitamin C for maintaining skin firmness. It is an exceptionally high-quality and gentle choice for anyone seeking a potent and bioavailable collagen-supporting nutrient.

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General Health
Impact
Highest effect
A+ Goal FitA+ Strength of SupportC+ CoverageA Formula Quality

Vitamin C in a non-acidic form supports foundational immune readiness and collagen synthesis without causing gastric discomfort. This buffered delivery system appears well aligned with long-term general health maintenance for sensitive individuals.

The inclusion of bioflavonoids may contribute to the stability and utilization of the active nutrient. Providing a 1,000 mg dose ensures that physiological requirements for antioxidant protection are meaningfully met.

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Anti-Inflammatory Support
Impact
Highest effect
A- Goal FitA+ Strength of SupportC+ CoverageA+ Formula Quality

Ester-C calcium ascorbate and citrus bioflavonoids provide advanced antioxidant support to quench the inflammatory cascade. This non-acidic form of vitamin C is meaningfully dosed for immune system modulation and oxidative stress reduction.

The 1000mg dose of vitamin C is optimized for cellular uptake and retention. Inclusion of bioflavonoids further supports the efficacy of the ascorbate through synergistic antioxidant effects.

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Vision Support
Impact
High effect
C+ Goal FitA Strength of SupportC- CoverageA Formula Quality

Vitamin C as Ester-C and Citrus Bioflavonoids support ocular tissue protection and vascular health in the eye. The 1,000 mg dose of Vitamin C appears well aligned with maximizing cellular antioxidant levels.

This supplement focused exclusively on Vitamin C lacks the essential minerals and carotenoids for complete vision support. It provides high-quality maintenance for one specific vision pathway while being exceptionally gentle on the stomach.

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Ingredients

IngredientAmount per serving
Vitamin C (Ester-C Calcium Ascorbate)
 1000 mg
Calcium (Ester-C Calcium Ascorbate)
 110 mg
C-Sorb Citrus Bioflavonoid Complex
102 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free Vegetarian
Report overview
Vitamin C (Ester-C Calcium Ascorbate) · 1000 mg OverallScore92
A- Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyA+ Value
This Ester-C tablet provides 1,000 mg of Vitamin C in a patented, non-acidic form that is clinically researched for its long-lasting immune support. It is highly bioavailable and exceptionally gentle on the digestive system, making it suitable for those with sensitivities. The product offers excellent financial value for a premium-grade supplement.
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