Sisu Ester-C 600

240 capsules
by Sisu
Product ID: S01116
Retail Price:

Vitasave: $48.99
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Sisu Ester-C 600


Vitamin C is a water-soluble antioxidant and one of the best researched nutrients. Most mammals can produce vitamin C as they need it but the human system evolved without this ability so we must ensure an adequate daily intake to stay healthy. Vitamin C is found in fruits and vegetables, but it is easily destroyed by heat, cooking, processing, and storage, and rapidly eliminated from our system in the urine. Inadequate levels of vitamin C may be seen in cases of physical and mental stress, older people and those with chronic conditions including cardiovascular disease, asthma, arthritis, age-related eye disease, and certain cancers. Vitamin C is best known for strengthening the immune system by supporting and improving white blood cell function. It is also essential for the proper formation of collagen, a building block of many tissues and a crucial component in skin rejuvenation. Vitamin C also helps to reduce histamine release in the body, thereby alleviating allergy symptoms. There are numerous forms of vitamin C with ascorbic acid being the most basic. People wanting a clinically proven form that is easier on the system than ascorbic acid may choose a form like Ester-C brand calcium ascorbate.



    • Ester-C is a unique, patented form of calcium ascorbate, which is made when ascorbic acid (regular vitamin C) is buffered with calcium using a water-based process
    • The calcium in Ester-C provides part of your daily calcium requirements
    • Ester-C contains active vitamin C metabolites including L-threonate, which enhance cellular absorption and retention
    • Ester-C is the only form of vitamin C that has been proven to last up to 24 hours in the white blood cells of the immune system
    • Less acidic and easier on the stomach than ascorbic acid
    • Enhanced with antioxidant bioflavonoids from citrus fruits for superior absorption
    • Ester-C has a clinically proven higher bioavailability and retention rate than other forms of vitamin C
Medicinal Ingredients
Servings Size: 1 Softgel
Servings Per Container: 240
Amount per Serving
Vitamin C (calcium ascorbate) 600 mg
from Ester-C brand calcium ascorbate
Bioflavonoids (citrus fruit) 100 mg
Non-medicinal ingredients: magnesium stearate (vegetable).
Capsule shell: hypromellose.
Contains no dairy, peanuts, wheat, gluten or soy.
Take 1-2 capsules daily or as directed by a health care practitioner.

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Customer Reviews

Based on 12 reviews
Patricia Young
Best quality vitamin C there is!

...outside of getting it all from oranges - there is no better brand. First, it has a clinically proven higher bioavailability and retention rate than other forms of vitamin C. If you need more, it comes in a glass jar, totally recyclable. I take one 600mg capsule each morning, but if I'm feeling run down or that I might be 'catching something', I take another one of these and my symptoms disappear. Literally, I have not been sick in YEARS. I'm 71 years old now and I've been using it almost forever - I highly recommend it!

James Nardi

You sent my order to the wrong address. I have not received any part of my order as per my previous email to which I have not seen a response.

Sandra T.
Excellent vitamin C

My favourite vitamin C as it’s gentle on the stomach and digests well. I don’t seem to get many colds when I’m on this product. I’ll keep buying it.

Irene Dauphinais
Great product

This will be my third winter taking Sisu ester C. I start taking it in October until the end of April. It has been two winters for me without a cold, hoping this third winter will bring the same results. I read that Ester C is the better choice when it comes to vitamin C, also it stays in our body for 24 hours. Good product, try it.

ruth a.
great stuff

timely efficient response on the product I needed