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Immune support; Antioxidant support; Upper respiratory wellness; Collagen formation support
Adults with busy lifestyles seeking convenient daily antioxidant support or those who prefer a gentler, non-acidic form of vitamin C.
Adults take 1 tablet once daily, preferably with a meal; taking with food may enhance tolerance of vitamin C.
Non-GMO; Suitable for vegetarians; Sodium free; No gluten, no wheat, no milk, no lactose, no artificial color, flavor or sweetener, no sugar, no starch, no soy, no yeast, no fish.
Vitamin C functions as an antioxidant and a cofactor for collagen-producing enzymes, and calcium ascorbate provides a non-acidic form that may be gentler on the stomach.
Caution: High intakes may cause digestive discomfort in some people; take with food if sensitive.
Citrus bioflavonoids such as hesperidin and rutin may help support antioxidant activity and vitamin C recycling in the body.
Caution: May interact with certain medications or cause mild digestive upset in sensitive individuals.
Calcium supports cellular signaling and enzyme functions, and here it serves as the mineral counterion forming the buffered vitamin C salt.
Caution: Total daily calcium from all sources matters; consider overall intake if you use other calcium-containing products.
Vitamin C provides primary antioxidant and collagen support, while citrus bioflavonoids may help protect vitamin C and support its activity. The calcium ascorbate form buffers acidity, which may make vitamin C easier on the stomach for daily use.
Label Warning: If you are pregnant, nursing, taking any medications, or have any medical condition, consult your doctor before use. Stop use and consult your doctor if any adverse reactions occur.
Who should be cautious: People with a history of kidney stones or high iron levels may need caution with high-dose vitamin C. Those with citrus sensitivities should consider the presence of citrus bioflavonoids.
Storage: Store at room temperature.
Many mention the non-acidic formula feels easy on digestion.
Users report feeling supported, including for skin and general wellness.
Several find the tablets big and somewhat hard to swallow.
This product is guaranteed authentic and backed by our easy returns & refunds policy. Details
Vitamin D3 & K2 may complement Vitamin C by supporting bone health and immune function, promoting a balanced approach to wellness.
AI generated. Not medical advice.
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Ester-C® Vitamin C lasts longer than regular Vitamin C in White Blood Cells over 24 hours!†
Enjoy the benefits of Ester-C® Vitamin C every day!
Not all Vitamin C is created equal...There is only One Unique Ester-C® formula
24 Hour Immune Support
Immune & upper respiratory health support.
Ester-C® is the unique immune health formula containing a proprietary, clinically studied Vitamin C that stays in your immune system for 24 hours.†
Ester-C® Vitamin C is clinically shown to last longer than regular vitamin C. That's because Ester-C® Vitamin C is carefully formulated to contain vitamin C metabolites, the same metabolites that are naturally produced by your body and help enhance the retention of vitamin C by your white blood cells, a vital part of your immune system. So once you take your daily dose of Ester-C® Vitamin C, it gets into your white blood cells, and stays there - for up to 24 hours. Vitamin C also contributes to the health of your upper respiratory tract, plus, Ester-C® Vitamin C is manufactured without chemicals to neutralize pH, which means it's non-acidic and gentle on your stomach. Ester-C® is the kind of support you can count on 24/7!
†Ester-C® Vitamin C has been clinically studied to stay in your white blood cells for up to 24 hours, which is longer than regular Vitamin C. White blood cells are an important component of the immune system.
For adults, take one (1) tablet once daily, preferably with a meal.
Vegetable cellulose. Contains <2% of: Calcium silicate, maltodextrin, natural palm leaf glaze, triacetin, vegetable magnesium stearate, vegetable stearic acid.
No gluten, no wheat, no milk, no lactose, no artificial color, flavor or sweetener, no sugar, no starch, no soy, no yeast, no fish.
Made in the USA with select ingredients from around the world.
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. Keep out of reach of children. Store at room temperature. Do not use if seal under cap is broken or missing.
While iHerb strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site. Although items may occasionally ship with alternate packaging, freshness is always guaranteed. We recommend that you read labels, warnings and directions of all products before use and not rely solely on the information provided by iHerb.
| Supplement facts | ||
| Serving Size: 1 Tablet | ||
| Amount Per Serving | %Daily Value | |
| Vitamin C (as Ester-C® Calcium Ascorbate) | 1,000 mg | 1,111% |
| Calcium (as Ester-C® Calcium Ascorbate) | 110 mg | 8% |
| C-Sorb™ Citrus Bioflavonoid Complex Citrus Bioflavonoid Complex (Citrus spp.) (peel and fruit), Sweet Orange, Tangerine, Lime, Lemon, Acerola Extract, Rutin, Hesperidin Complex (Citrus spp.) (peel), Naturally Occurring Vitamin C Metabolites | 102 mg | ** |
| **Daily Value not established. | ||
