• 600 mg Ester-C calcium ascorbate per capsule, paired with arabinogalactan and bioflavonoids to support immune health, skin, joints, and vision.
• Clinical studies show Ester-C raises and sustains vitamin C levels in white blood cells for up to 24 hours.
• Citrus-free, vegan, non-GMO formula with no dairy, gluten, or soy.
• Gentle on the stomach with a less-acidic profile, making it easier on digestion.
Popular Searches
Top Brands
Available in store
SISU, Ester-C Supreme, 210 Capsules
Size
210
vegetarian capsules
UPC
777672011091
Best Before
08/2028
62 people have viewed this item in the last 7 days
About this item
Suggested Use
Take one to two SISU Ester-C Supreme capsules daily or as directed by a health care practitioner.
Ingredients
Each vegetarian capsule contains:
Vitamin C (calcium ascorbate) from Ester-C® brand calcium ascorbate
600
mg
Arabinogalactan (Larix occidentalis/Larix laricina) (bark/stem)
100
mg
Quercetin (fruit)
50
mg
Multianthocyanidins (berry/fruit*) *black currant (Ribes nigrum), cranberry (Vaccinium macrocarpon), blueberry (Vaccinium corymbosum), bilberry (Vaccinium myrtillus)
50
mg
Calcium (calcium ascorbate)
72
mg
Non-medical Ingredients:
Magnesium stearate (vegetable)
Capsule shell: hypromellose.
Capsule shell: hypromellose.
Description
The Better Vitamin C; Ester-C Supreme is a citrus-free vitamin C formula with antioxidant bioflavonoids & immune-boosting arabinogalactan.
Immune Support & More; This antioxidant-rich Ester-C formula supports immune health, as well as skin, joints, and vision.
Well Retained; Clinical studies show that Ester-C increases vitamin C levels in the body for up to 24 hours.
Superior Absorption; Regular vitamin C is first buffered with calcium, then a special process transforms it into trademarked Ester-C. This vegan, non-GMO formula contains no dairy, gluten, or soy.
Gentle On The Stomach; Sisu Ester-C Supreme is a less-acidic vitamin C that is gentle on the digestive system.
Frequently Asked Questions
What is SISU Ester-C Supreme and what is it used for?
SISU Ester-C Supreme is an advanced immune support supplement centered on Ester-C, a pH-neutral form of vitamin C (calcium ascorbate) that is gentler on the stomach than regular ascorbic acid. Each vegetarian capsule provides Ester-C 600mg plus arabinogalactan 100mg, quercetin 50mg, and mixed anthocyanins 50mg (from blackcurrant, cranberry, blueberry, and bilberry). This formula supports immune function, antioxidant defense, and white blood cell activity, with a 24-hour retention profile in white blood cells.
What are the key ingredients in SISU Ester-C Supreme and how do they work?
Ester-C (calcium ascorbate) 600mg: a patented, pH-neutral vitamin C that is absorbed into white blood cells and retained for 24 hours, compared to regular vitamin C which clears within hours. Arabinogalactan 100mg: a prebiotic fiber from larch tree that stimulates natural killer cell activity and supports gut-associated immunity. Quercetin 50mg: a flavonoid with antioxidant and anti-inflammatory properties that complements vitamin C function. Mixed anthocyanins 50mg from blackcurrant, cranberry, blueberry, and bilberry: polyphenols that provide additional antioxidant support and vascular protection. Calcium 72mg is provided as a co-factor from the calcium ascorbate form.
Who should use SISU Ester-C Supreme and how is it taken?
Suitable for adults who want immune and antioxidant support year-round, and particularly for those with sensitive stomachs who experience digestive discomfort from regular vitamin C supplements. Also appropriate for people who avoid citrus and for those seeking non-acidic vitamin C. Take 1 to 2 capsules daily. No upper tolerance issues reported at this dose for most adults. Those with kidney disease or calcium metabolism disorders should consult a physician before use, as the formula provides calcium.
What makes SISU Ester-C Supreme different from regular vitamin C supplements?
Ester-C is a patented, pH-neutral form of vitamin C with documented 24-hour white blood cell retention, which regular ascorbic acid lacks. SISU introduced Ester-C to Canada in 1988 and has over 35 years of experience with this ingredient. The formula adds arabinogalactan (for NK cell stimulation), quercetin, and four-source anthocyanins — making it a multi-mechanism immune formula rather than a simple vitamin C tablet. The non-citrus formulation means it is tolerated by people sensitive to citrus. SISU was founded in Vancouver in 1980 and focuses on premium supplement formulations for the Canadian market.
What is SISU?
SISU is a Canadian supplement brand founded in 1980 in Vancouver, BC by Harlan Lahti, who set out to offer Canadians better alternatives to the natural health products then available. Today SISU is one of Canada's five largest supplement companies, offering a full range of vitamins, minerals, and specialty formulas independently tested by third-party laboratories. The brand is recognized across Canada for its signature cobalt blue glass bottles, which protect nutrients from light, oxygen, and moisture.
What makes SISU different from other Canadian supplement brands?
In 1988, SISU became the first company to bring Ester-C to Canadian consumers, serving as exclusive distributor before the market opened more broadly. This early move into a more bioavailable form of vitamin C established SISU as an innovator rather than a commodity reseller. The brand's signature cobalt blue glass bottles with recyclable tin lids provide scientifically validated protection against the three primary agents of nutrient degradation — light, oxygen, and moisture — while remaining fully recyclable, unlike most plastic supplement packaging.
The information provided above is for reference purposes only and has not been reviewed or approved by Health Canada. It does not constitute medical advice and should not replace consultation with a qualified healthcare professional.
Caution
This product is not intended to diagnose, treat, cure, or prevent any disease.
Disclaimer
You should not use the information or services on this Site to diagnose or treat any health issues or for prescription of any medication or other treatment.
Always check the product label or packaging prior to using any product. If there are discrepancies, customers should follow the information provided on the product label or packaging.
SISU, Ester-C Supreme, 210 Capsules
Size
210
vegetarian capsules
UPC
777672011091
Best Before
08/2028
62 people have viewed this item in the last 7 days
$67.99
Quantity
Not enough inventory in stock
Purchase limit exceeded
In-Store Purchases
In stock at LIFEPLUS Natural Health
#1825 - 4720 Mcclelland Rd, Richmond, BC
Free in-store pickup available
Ready by
Today, Aug 15
⏱️
Shipping Options
Available to ship
Estimate Ship Date
Today, Aug 15
⏱️
Metro Vancouver
Free Shipping Over $69
Within Canada
Free Shipping Over $99
United States
Mainland China
Starting from $9
