Sisu
Sisu Ester-C Supreme (VCaps)
24-hour vitamin C protection with enhanced absorption and retention
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Why Choose This Product
24-HOUR IMMUNITY
Proven to stay in your white blood cells for 24 hours — unlike regular vitamin C that clears in hours.
GENTLE STOMACH
Calcium-buffered formula is less acidic and easier on your stomach than standard ascorbic acid.
SUPERIOR ABSORPTION
Enhanced with quercetin and berry bioflavonoids for maximum vitamin C uptake and cellular retention.
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How It Works
How It Works
Ester-C uses a patented calcium ascorbate process that creates vitamin C metabolites including L-threonate. These metabolites enhance cellular absorption and help vitamin C stay active in your white blood cells for up to 24 hours. The added quercetin and berry bioflavonoids work together to maximize absorption while arabinogalactan provides additional immune support.
Who It's For
Adults who want sustained immune support without multiple daily doses. Those with sensitive stomachs who can't tolerate regular vitamin C. Anyone seeking maximum bioavailability from their vitamin C supplement.
Who It's Not For
Not suitable if you're avoiding calcium supplementation or have kidney stones. Children should use age-appropriate formulations.
About This Product
What It Does
Delivers 24-hour vitamin C protection with a single daily dose. Unlike regular vitamin C that clears your system in hours, Ester-C's patented calcium ascorbate formula stays active in your immune cells for up to 24 hours. Enhanced with quercetin and berry bioflavonoids for maximum absorption.
Why It Works
- PROVEN RETENTION: Clinical studies show Ester-C remains in white blood cells 24 hours — no other vitamin C can make this claim.
- ENHANCED ABSORPTION: Contains L-threonate metabolites that improve cellular uptake compared to standard ascorbic acid.
- STOMACH-FRIENDLY: Calcium-buffered process makes it less acidic and gentler than regular vitamin C.
- SYNERGISTIC SUPPORT: Quercetin provides anti-inflammatory benefits while berry bioflavonoids boost vitamin C absorption.
What's Inside
Clean vegan formula in vegetable capsules. Contains no dairy, wheat, gluten, peanuts or soy. Made in Canada to strict quality standards.
Why we carry it: The only vitamin C with published research proving 24-hour immune cell retention — results that matter.
How to Take
Full Ingredients
| Medicinal Ingredients | |
| Servings Size: 1 Veg Caps | |
| Servings Per Container: 120 | |
| 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 | |
| Non-medicinal ingredients: magnesium stearate (vegetable). | |
| Capsule shell: hypromellose. | |
| Contains no dairy, wheat, gluten, peanuts or soy. | |
Customer Reviews
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Questions & Answers
Research & Science
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