Sisu Ester-C Supreme Powder 125 g

125 g
by Sisu
Product ID: S01115
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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, therefore 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, the 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 quercetin, a bioflavonoid and powerful antioxidant with anti-inflammatory and anti-histamine properties
  • Added bioflavonoids from berry fruits for superior vitamin C absorption
  • Arabinogalactan is a type of polysaccharide that offers additional immune support during stressful times and the cold and flu season
  • Ester-C has a clinically proven higher bioavailability and retention rate than other forms of vitamin C
  • Formulated with citrus-free ingredients for people wishing to avoid citrus
Medicinal Ingredients
Servings Size: ¼ teaspoon (1 gram)
Servings Per Container: 125
Amount per Serving
Vitamin C (calcium ascorbate) 638 mg
from Ester-C brand calcium ascorbate
Arabinogalactan (Larix occidentalis) bark 100 mg
Quercetin (fruit) 50 mg
Multianthocyanidins (berry/fruit*) 50 mg
*bilberry, cranberry, black currant, grape
Contains no dairy, gluten, wheat, soy, added flavours or sweeteners, artificial colours, fillers or additives.
Adult dosage: Take 1 gram (¼ teaspoon) twice daily or as directed by a health care practitioner.
Take 1 gram (¼ teaspoon) twice daily or as directed by a health care practitioner.

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Customer Reviews

Based on 8 reviews
Kevin Ekman
Great product, Great service

Product as expected very quick service and shipping. Great company to deal with!

My favourite vitamin C

I’ve been taking this for years. Really helps with seasonal allergies

Judine Wilson
Good product

Sisu is a good brand and this loose powder form of the Ester C is hard to find around here. Glad to shop and have it arrive in the mail. I don't have back problems, maybe this is the reason, don't know, but I do know it fends off the cold and flu bugs - haven't had a cold for yrs. Also put some in my older dogs food, if it's good for me, maybe they could use a bit extra too.

Sisu Ester-C

This vitamin is recommended for pain and to fight off the various flu bugs going around. The ester product is easy on the stomach.

Michael V.
Sisu Ester-C

I use Sisu Ester-C to keep the pain from a lumbar disc problem. It works. I doubt if any of you has heard of this this before - but I discovered it accidentally. I had ordered a bottle for the first time in my life on a whim, and just happened to be at a bad time with my back when i took it for the first time. Low and behold pain remarkably subsided over the next couple of days. I researched the internet and found other people with bad backs had discovered this also. Check it out for yourselves.