{"product_id":"sisu-ester-c-supreme","title":"SISU Ester-C Supreme 600mg Buffered Vitamin C Capsules, Calcium Ascorbate with Quercetin","description":"\u003ch2\u003eSISU Ester-C Supreme 600mg Details\u003c\/h2\u003e\n\u003cp\u003eSISU Ester-C Supreme is buffered, non-acidic vitamin C built around the patented Ester-C® form (calcium ascorbate with naturally occurring vitamin C metabolites), plus added citrus bioflavonoids and quercetin. 600mg per capsule, designed to stay in white blood cells longer than standard ascorbic acid and to be gentler on the stomach. A sensible step up for adults who want a premium-tier vitamin C without going to liposomal liquid territory.\u003c\/p\u003e\n\n\u003cp class=\"vitamart-trust-strip\"\u003e\u003cstrong\u003eVitamins Lowest Prices\u003c\/strong\u003e | \u003ca href=\"https:\/\/www.vitamart.ca\/pages\/low-price-guarantee\"\u003eLowest Price in Canada — Guaranteed\u003c\/a\u003e | Ships from Ontario across Canada\u003c\/p\u003e\n\n\u003ch3\u003eQuick Facts\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSISU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eForm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVegetarian capsule\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVitamin C\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e600mg per capsule (Ester-C® calcium ascorbate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003epH\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNon-acidic, buffered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAdded cofactors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCitrus bioflavonoids + quercetin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDose\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 capsule daily (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVegetarian, gluten-free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWho SISU Ester-C Supreme Is For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eYou want a buffered, non-acidic vitamin C that's easier on the stomach\u003c\/li\u003e\n\u003cli\u003eYou've tried regular ascorbic acid and found it caused heartburn or stomach upset\u003c\/li\u003e\n\u003cli\u003eYou want vitamin C with cofactors (bioflavonoids, quercetin) like it occurs in nature, not isolated alone\u003c\/li\u003e\n\u003cli\u003eYou want a once-daily dose that's reasonable, not megadose territory\u003c\/li\u003e\n\u003cli\u003eYou want a recognized branded form (Ester-C®) backed by formulation research\u003c\/li\u003e\n\u003cli\u003eYou want a capsule format — no powders, no liquids, no mixing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWho this product is NOT for:\u003c\/strong\u003e Anyone on a strict sodium-restricted or calcium-restricted diet should mention this to their practitioner — Ester-C is calcium ascorbate, so each serving contributes some calcium. Anyone with a history of kidney stones should consult their practitioner before higher-dose vitamin C use. If you want a true liquid liposomal C (Quicksilver or similar) for maximum absorption, that's a different category at a premium-tier price.\u003c\/p\u003e\n\n\u003ch3\u003eVitamart's Take\u003c\/h3\u003e\n\u003cp\u003eSISU Ester-C Supreme is a daily vitamin C supplement for immune and antioxidant support. It uses Ester-C®, a patented buffered form of vitamin C that’s non-acidic and gentler on the stomach than plain ascorbic acid. The formula also includes citrus bioflavonoids and quercetin, plant compounds that naturally occur alongside vitamin C.\u003c\/p\u003e\n\n\u003ch3\u003eHow SISU Ester-C Supreme Compares\u003c\/h3\u003e\n\n\u003ch4\u003eEster-C Supreme vs Plain Ascorbic Acid\u003c\/h4\u003e\n\u003cp\u003ePlain ascorbic acid tablets are the lowest-cost route to vitamin C — fine if your stomach handles them and you don't need cofactors. Ester-C Supreme uses buffered calcium ascorbate (non-acidic) plus added bioflavonoids and quercetin. Choose plain ascorbic acid for budget daily use; choose Ester-C Supreme for digestive comfort and the bioflavonoid cofactor profile.\u003c\/p\u003e\n\n\u003ch4\u003eEster-C Supreme vs Naka Liposomal Vitamin C Softgels\u003c\/h4\u003e\n\u003cp\u003eNaka Liposomal Vitamin C uses a liposomal-style softgel with sodium ascorbate buffering for absorption focus. Ester-C Supreme uses calcium ascorbate (Ester-C®) with added bioflavonoids and quercetin in a capsule. Different buffering approaches, different cofactor stacks. Ester-C has more years of clinical history; the liposomal softgel is the newer absorption-tech approach. Choose based on preference and how each sits with your stomach.\u003c\/p\u003e\n\n\u003ch4\u003eEster-C Supreme vs Acerola Cherry Whole-Food Vitamin C\u003c\/h4\u003e\n\u003cp\u003eWhole-food vitamin C (acerola, camu camu, amla) delivers a smaller dose of vitamin C alongside hundreds of co-occurring plant compounds — appealing if you prefer a food-based supplement philosophy. Ester-C Supreme uses a higher-potency synthesized vitamin C (in calcium ascorbate form) with isolated bioflavonoids and quercetin added back. Choose whole-food if you want the lowest-dose food-based approach; choose Ester-C for higher daily potency with researched cofactors.\u003c\/p\u003e\n\n\u003ch3\u003eWhat \"Buffered\" Vitamin C Means\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStraight ascorbic acid is acidic\u003c\/strong\u003e — pH around 2.5, similar to lemon juice. Some people experience heartburn, stomach upset, or loose stools at higher doses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuffered forms\u003c\/strong\u003e bind ascorbic acid to a mineral (sodium ascorbate, calcium ascorbate, magnesium ascorbate). The acidity is neutralized, making the same vitamin C easier on a sensitive stomach.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEster-C® is a patented form of calcium ascorbate\u003c\/strong\u003e that also contains naturally occurring vitamin C metabolites (threonate, lyxonate, xylonate) — the same compounds your body makes when it uses ascorbic acid. The \"Supreme\" version adds citrus bioflavonoids and quercetin on top.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium note:\u003c\/strong\u003e calcium ascorbate contributes a small amount of calcium per dose. Most people don't notice; mention to your practitioner if you're on a calcium-restricted diet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBioflavonoids and quercetin\u003c\/strong\u003e are plant compounds that occur naturally alongside vitamin C in citrus fruit. Often included in higher-quality vitamin C formulas for the synergy.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow To Use\u003c\/h3\u003e\n\u003cp\u003eTake 1 capsule daily, with or without food. For higher-dose routines, split the dose across the day (vitamin C absorption peaks at moderate doses; very high single doses are partly excreted).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCautions:\u003c\/strong\u003e Consult your healthcare practitioner before use if you are pregnant or breastfeeding, have a history of kidney stones, hyperoxaluria, hemochromatosis, or are on a calcium-restricted diet. Vitamin C can interfere with some blood tests — let your practitioner know if you have bloodwork scheduled. Keep out of reach of children.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e➕ \u003cstrong\u003eWhat's the difference between Ester-C and regular vitamin C?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cdiv\u003eRegular vitamin C is ascorbic acid — an acidic compound. Ester-C® is a patented calcium ascorbate form that's buffered (non-acidic) and contains naturally occurring vitamin C metabolites. Both deliver vitamin C; Ester-C is designed to be gentler on the stomach and to stay in white blood cells longer.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e➕ \u003cstrong\u003eWhy does it have bioflavonoids and quercetin?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cdiv\u003eIn nature, vitamin C never appears alone — it's always alongside bioflavonoids and other plant compounds. Adding them back to a supplement is meant to support the synergy that occurs in whole foods. Quercetin in particular is a flavonoid that's commonly stacked with vitamin C for immune and antioxidant support.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e➕ \u003cstrong\u003eCan I take it on an empty stomach?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cdiv\u003eYes — Ester-C is buffered, so it doesn't cause the stomach upset that straight ascorbic acid sometimes does. Most people tolerate it on an empty stomach or with food, whichever fits their routine.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e➕ \u003cstrong\u003eHow much vitamin C should I take daily?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cdiv\u003eThe RDA is 90mg for adult men and 75mg for adult women, but many practitioners suggest 500–1000mg\/day for general antioxidant and immune support. Higher doses (2000mg+) are sometimes used short-term for immune support but can cause digestive issues. Always work with your practitioner on doses above standard daily amounts.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e➕ \u003cstrong\u003eIs Ester-C okay with iron supplements?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cdiv\u003eYes — vitamin C actually improves iron absorption, which is why iron supplements are often recommended with vitamin C. Take them together.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e➕ \u003cstrong\u003eCan I take it with my zinc or other immune stack?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cdiv\u003eYes — vitamin C, zinc, vitamin D, and quercetin are commonly stacked for daily immune support. This formula already includes quercetin, so a separate quercetin product isn't needed.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003ch3\u003ePairs Well With\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.vitamart.ca\/collections\/vitamin-d\"\u003eVitamin D\u003c\/a\u003e — foundational immune support, especially in Canadian winters\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.vitamart.ca\/collections\/zinc\"\u003eZinc\u003c\/a\u003e — classic immune-support stack with vitamin C\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.vitamart.ca\/collections\/collagen\"\u003eCollagen\u003c\/a\u003e — vitamin C is required for collagen synthesis\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.vitamart.ca\/collections\/iron-supplements\"\u003eIron supplements\u003c\/a\u003e — vitamin C improves iron absorption\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e💡 Subscribe \u0026amp; save up to 10% on every order — never run out of your daily supplements.\u003c\/p\u003e\n\n\u003ch3\u003eCompare Similar Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.vitamart.ca\/collections\/vitamin-c-supplements\"\u003eAll Vitamin C Supplements\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.vitamart.ca\/collections\/immune-health\"\u003eImmune Support Supplements\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.vitamart.ca\/collections\/greens-superfoods-and-antioxidants\"\u003eAntioxidants \u0026amp; Superfoods\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.vitamart.ca\/collections\/cough-cold-and-flu\"\u003eCold \u0026amp; Flu Support\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAbout Vitamart\u003c\/h3\u003e\n\u003cp\u003eVitamart.ca is Canada's vitamin specialist. We've been selling vitamins and supplements to Canadian families since 2005, shipping from our Ontario warehouse to every province. We believe in \u003cstrong\u003equality products you trust at prices you love\u003c\/strong\u003e — no fancy packaging markups, no pushy upsells, just the vitamins you need at the lowest prices in Canada. Backed by our \u003ca href=\"https:\/\/www.vitamart.ca\/pages\/low-price-guarantee\"\u003eLow Price Guarantee\u003c\/a\u003e: find a lower advertised price at a Canadian competitor and we'll beat it by 1¢.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVitamins Lowest Prices.\u003c\/strong\u003e\u003c\/p\u003e","brand":"SISU","offers":[{"title":"60 Vegetable Capsules","offer_id":42622028939435,"sku":"1112-DiscoVitamart","price":22.95,"currency_code":"CAD","in_stock":false},{"title":"120 Vegetable Capsules","offer_id":42622028972203,"sku":"1113 - 20","price":41.45,"currency_code":"CAD","in_stock":true},{"title":"210 Vegetable Capsules","offer_id":42622029037739,"sku":"1109 - 13","price":65.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0621\/4126\/8139\/products\/SISU-Ester-C-Supreme-600mg-210-Veg-Caps_01f45992-93ea-42ab-b4ac-4e6ec2a6a73c.jpg?v=1710963357","url":"https:\/\/www.vitamart.ca\/fr\/products\/sisu-ester-c-supreme","provider":"Vitamart.ca","version":"1.0","type":"link"}