🟢 98/100

This product looks safe

  • Folate: 20mg is 20.0× the Tolerable Upper Intake Level (1.0mg)
  • 55% of ingredients have research evidence
C Label Compliance Grade

Product Label

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Safety Alerts

⚠️ Folate: 20mg is 20.0× the Tolerable Upper Intake Level (1.0mg)

Label Data

10 Gram(s) Serving Size
21 Servings
Other Combinations Product Type
55% Evidence Coverage

Supplement Facts — Evidence Check

Calories
25 Calorie(s)
Total Carbohydrates
6 Gram(s) (2% DV)
Vitamin C
1026 mg (1140% DV)
0.38 mg (32% DV)
✅ Within RDA (0.3× RDA of 1.2 mg) 📚 76 studies (Tier A: 0, B: 33)
RDA 1.2mg This product: 0.38mg
0.43 mg (33% DV)
✅ Within RDA (0.3× RDA of 1.3 mg) 📚 12 studies (Tier A: 0, B: 1)
RDA 1.3mg This product: 0.43mg
5 mg (31% DV)
✅ Within RDA (0.4× RDA of 14 mg) 📚 193 studies (Tier A: 5, B: 63)
RDA 14mg This product: 5mg UL 35mg
10 mg (588% DV)
📊 7.7× RDA — above typical dose (UL: 100 mg) 📚 113 studies (Tier A: 3, B: 35)
RDA 1.3mg This product: 10mg UL 100mg
20 mcg DFE (5% DV)
⚠️ Exceeds Tolerable Upper Intake Level by 20.0× (UL: 1.0 mg) 📚 225 studies (Tier A: 10, B: 105)
RDA 0.4mg This product: 20mg UL 1.0mg
25 mcg (1042% DV)
📊 10.4× RDA — above typical dose 📚 138 studies (Tier A: 1, B: 44)
RDA 0.0024mg This product: 0.025mg
2.5 mg (50% DV)
✅ Within RDA (0.5× RDA of 5 mg) 📚 1 studies — no high-quality reviews
RDA 5mg This product: 2.5mg
Calcium
150 mg (12% DV)
150 mg (12% DV)
✅ Within RDA (0.2× RDA of 700 mg) 📚 12 studies (Tier A: 0, B: 3)
RDA 700mg This product: 150mg UL 4000mg
60 mg (12% DV)
📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)
This product: 60mg
2 mg (18% DV)
✅ Within RDA (0.2× RDA of 11 mg) 📚 258 studies (Tier A: 6, B: 134)
RDA 11mg This product: 2mg UL 40mg
0.5 mg (22% DV)
✅ Within RDA (0.2× RDA of 2.3 mg) 📚 8 studies — no high-quality reviews
RDA 2.3mg This product: 0.5mg UL 11mg
5 mcg (14% DV)
✅ Within RDA (0.1× RDA of 0.035 mg) 📚 197 studies (Tier A: 1, B: 55)
RDA 0.035mg This product: 0.005mg
90 mg (4% DV)
📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)
This product: 90mg
Sodium
100 mg (4% DV)
Potassium
280 mg (6% DV)
Antioxidant Health Proprietary Blend
58 mg

Other Ingredients

Fructose Maltodextrin Malic Acid Citric Acid natural Orange flavor Silica Beta-Carotene Vegetable Cellulose

Label Claims — Verification

Nutrient
All Other
Structure/Function
All Other (99% of products) Structure/Function (83% of products) Nutrient (54% of products)

Target Groups

Vegan Vegetarian Adult (18 - 50 Years) Gluten Free Dairy Free

Product Information

📋 Directions for Use

Once a day is all you need.

Just take one packet daily with 4-6 fl. oz. of water and you are good to go!

Directions: For adults, pour packet into 4-6 fl. oz. of water once daily. Stir or shake.

Take once a day!

⚠️ Warnings & Precautions

Warning: If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use.

Discontinue use and consult your doctor if any adverse reactions occur.

Not intended for use by persons under the age of 18. Keep out of reach of children.

Do not use if packet is torn or open.

🧪 Formulation Notes

The Ester-C Difference: Clinically studied to stay in white blood cells longer than regular vitamin c Unique formula with 24/7 immune support

Ester-C Effervescent Vitamin C packets offer 24-hour immune support in a delicious, natural orange flavored formula.

Unique Ester-C increases levels of Vitamin C in the body-- getting into white blood cells (an important part of you immune system), and staying there longer than regular vitamin C. One serving daily of 1000 mg of Ester-C delivers 24-hour immune support and potent antioxidant activity... 365 days a year.

Taken once a day, Ester-C has your immune health covered. It supports circulation, is beneficial to joints and connective tissues, and is involved in collagen formation, which forms the basis of healthy skin. As a potent antioxidant, it helps fight free radicals. Free radicals can cause oxidative stress, which may lead to premature aging of metabolic cells. Ester-C also aids in the nutritional absorption of iron and works with other nutrients to promote overall health.

Along with essential vitamins, such as B-6 and B-12 to support energy metabolism and vital electrolytes to aid in metabolic hydration, Ester-C Effervescent Formula has your immune support covered.

Along with essential vitamins, such as B-6 and B-12 to support energy metabolism and vital electrolytes to aid in metabolic hydration, Ester-C Effervescent Formula has got you covered.

No gluten, no yeast, no wheat, no dairy, no lactose, no soy, no egg, no grapefruit, no artificial sweetener, no peanuts, no tree nuts, no fish.

Natural orange flavor, beta-carotene added for color.

Non-GMO.

Vegetarian/vegan

One packet provides as much vitamin C as 10 oranges

Plus electrolytes Unique Vitamin C formula B vitamins to support energy metabolism

24-hour immune support

Vegan

Non-GMO No Artificial sweeteners

Additional Information

Ester-C The better vitamin C

Now more than ever, trust your immune health to Ester-C.

Store at room temperature.

^ Food is the best source of nutrients, but supplements can help. Based on USDA.gov nutrient database for 1 large, raw orange.

Product Details

DSLD Entry Date 2021-04-22
Product Type Other Combinations
Form Powder
DSLD ID 248855
Data Updated 2026-04-11

Research Evidence

371 Research Sources
54 Avg Quality Score
148 Meta Analysis
82 Systematic Review
71 Rct
62 Clinical Trial
2 Regulatory Source
1 Cochrane Review
1 Narrative Review
1 Other
1 Openfda Safety
A Vitamin C supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015
A Vitamin C supplementation for the primary prevention of cardiovascular disease
Systematic Review The Cochrane database of systematic reviews 2017
A Vitamin C for preventing and treating the common cold
Meta Analysis The Cochrane database of systematic reviews 2013
A Vitamin C for preventing and treating pneumonia
Meta Analysis The Cochrane database of systematic reviews 2013
A Vitamin E supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015
A Vitamin C supplementation for prevention and treatment of pneumonia
Meta Analysis The Cochrane database of systematic reviews 2020
A Vitamin C supplementation for prevention and treatment of pneumonia
Systematic Review The Cochrane database of systematic reviews 2021
A Nutritional interventions for preventing and treating pressure ulcers
Meta Analysis The Cochrane database of systematic reviews 2024
A Does Vitamin C Supplementation Provide a Protective Effect in Periodontal Health? A Systematic Review and Meta-Analysis
Meta Analysis International journal of molecular sciences 2024
A Circulating vitamin C concentration and risk of cancers: a Mendelian randomization study
Meta Analysis BMC medicine 2021
View all evidence for Vitamin C →

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