SISU Ester-C
1000 mg 120 Tablets
SISU Ester-C helps in the development and maintenance of bones, cartilage, teeth and gums. An antioxidant for the maintenance of good health.

  • 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 powerful bioflavonoid and antioxidant with anti-inflammatory and anti-histamine properties
  • Ester-C® has a clinically-proven, higher bioavailability and retention rate than other forms of vitamin C
SISU Advantages:
  • High-potency tablets for people wishing to supply their needs with fewer pills
  • Easy-to-swallow, coated tablets
  • Suitable for vegans
  • Contains no ingredients that are a source of gluten
  • Good Manufacturing Practices standards
  • Tested for guaranteed purity and potency
  • NPN approved


  • Medicinal: Vitamin C (calcium ascorbate*)...1,000 mg, Calcium (calcium ascorbate*)...125 mg *from Ester-C® brand calcium ascorbate, Citrus bioflavonoids...200 mg from the fruit and peel of orange, lemon, grapefruit, and mandarin orange, and from the fruit of lime, Acerola (Malpighia glabra, fruit)...25 mg, 4:1 extract, QCE 100 mg, Rose hip (Rosa canina, fruit)...25 mg, Rutin (Dimorphandra mollis, fruit)...25 mg
  • Non-Medicinal: calcium phosphate dibasic, microcrystalline cellulose, croscarmellose sodium, silicon dioxide, stearic acid (vegetable), magnesium stearate (vegetable), maltodextrin.
  • Coating: hypromellose, vegetable glycerin, purified water.
Dosage: (Adult) Take 1 tablet daily or as directed by a health care practitioner.

*Please Note: Product now includes citrus.

We are only able to ship this item to Canadian customers.
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Brenda: a few months ago

Best Vit C I’ve ever had. Easy on the stomach too!

Larry: a few months ago

Love this product and although a new customer with Well.CA I have been shown I can depend on their service

Brenda: a few months ago

Great brand, great product, BEST price!! I've used it forever (it seems) & appreciate carrying it since no one beats their prices.

Elena: more than a year ago

Love this product. Have been using it for years. The only thing I'm not crazy about is the tablet form changed from capsule. That said, they are just as easy to swallow.

Omar: more than a year ago

Incredible hard to swallow, need to break up. wish was in a gel cap,

otherwise would give it five stars for vegan 1000mg vitamin c

Ciel: more than a year ago

I've recently discovered this product and am now loyal to the brand. With two small children in daycare this supplement is a must at keeping us healthy!

Laurel: more than a year ago

Have been looking for something to replace SISU's EVC capsules (long discontinued). EVC really worked for me and with chaos in my life I need to avoid or get rids of colds quickly. Trusting this high potency Vitamin C will work.

Catherine: more than a year ago

SISU is an excellent company. Their products are exceptional for quality and price. We use Ester C 1,000mg daily and never had a cold or flu.

sheila: more than a year ago

I have been using this product for quite awhile. I have not had a bad winter cold for a long time and so I attribute part of the reason to ester-c.
My immune system has also been strengthened.

Svitlana: more than a year ago

Good product. I will buy it again.

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