--- product_id: 16943403 title: "21st Century Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free" brand: "21st century" price: "144 kr" currency: DKK in_stock: true category: "21st Century" url: https://www.desertcart.dk/products/16943403-21st-century-vitamin-c-500mg-prolonged-release-tablets-immune-110ct store_origin: DK region: Denmark --- # 500mg prolonged release gluten free & vegan-friendly immune & antioxidant support 21st Century Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free **Brand:** 21st century **Price:** 144 kr **Availability:** ✅ In Stock ## Summary > 🛡️ Stay ahead, stay strong — your immune system’s all-day bodyguard! ## Quick Answers - **What is this?** 21st Century Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free by 21st century - **How much does it cost?** 144 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/16943403-21st-century-vitamin-c-500mg-prolonged-release-tablets-immune-110ct) ## Best For - 21st century enthusiasts ## Why This Product - Trusted 21st century brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Clean & Pure Formula:** No added sugar, salt, yeast, preservatives, or artificial flavors—just pure wellness. - • **Powerful Immune Shield:** Vitamin C’s antioxidant properties help neutralize free radicals and boost your natural defenses. - • **Trusted Quality Since 2005:** Backed by 30+ years of expert manufacturing and a 4.6-star rating from thousands of users. - • **Steady 12-Hour Nutrient Flow:** Prolonged release technology ensures your body gets a consistent 500mg dose all day long. - • **Vegan & Gluten-Free Certified:** Perfectly tailored for conscious professionals who demand clean, allergen-free supplements. ## Overview 21st Century Vitamin C 500mg Prolonged Release Tablets deliver a steady, all-day supply of immune-boosting antioxidant support in a clean, vegan, and gluten-free formula trusted for over 30 years. Each bottle contains 110 tablets designed for adults seeking reliable, high-quality vitamin C supplementation without additives. ## Description 21st Century's prolonged release Vitamin C-500 provides long-term vitamin supplementation by slowly releasing nutrients to the body over an extended period of time. Vitamin C is an important antioxidant nutrient that helps neutralize free radicals and support a healthy immune system. ## Features - ANTIOXIDANT AND IMMUNE SUPPORT: Vitamin C is an important antioxidant nutrient that supports the immune system - PROLONGED RELEASE: Prolonged release vitamins slowly release nutrients into the body over an extended period of time - NO ADDED: No added Sugar, Salt, Yeast, Preservatives or Artificial Flavors. Gluten Free. Suitable for Vegans. Non-GMO - GUARANTEED QUALITY: 21st Century HealthCare manufactures over 500 vitamins and nutritional supplements that are trusted to be 100% safe, contain the purest ingredients and are guaranteed for label potency - TRUSTED EXPERTS: For over 30 years, 21st Century HealthCare has been dedicated to manufacturing only the highest quality vitamins and supplements in Tempe, Arizona. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00166U2UA | | ASIN | B00166U2UA | | Age Range Description | Adult | | Allergen Information | Gluten Free | | Best Sellers Rank | #59,964 in Health & Household ( See Top 100 in Health & Household ) #340 in Vitamin C Supplements | | Brand Name | 21st Century | | Color | No Color | | Container Type | Bottle | | Customer Reviews | 4.6 4.6 out of 5 stars (391) | | Date First Available | May 7, 2005 | | Diet Type | Gluten Free | | Dosage Form | 500 | | Flavor | Unflavored | | Global Trade Identification Number | 00740985211908 | | Item Dimensions | 2.38 x 1.75 x 3.75 inches | | Item Form | Tablet | | Item Weight | 4.16 ounces | | Item model number | 21190 | | Manufacturer | 21st Century | | Manufacturer | 21st Century | | Manufacturer Part Number | 21190 | | Material Type Free | Gluten Free | | Model Name | ury C 500 mg Prolonged Release Tablets, 110 Count (21190) | | Model Number | 21190 | | Number of Items | 1 | | Primary Supplement Type | Vitamin C | | Product Benefits | Immune Support | | Product Dimensions | 2.38 x 1.75 x 3.75 inches; 4.15 ounces | | Specific Uses For Product | Antioxidant, Immunity | | UPC | 740985211908 | | Unit Count | 110 Count | ## Product Details - **Brand:** 21st Century - **Diet Type:** Gluten Free - **Flavor:** Unflavored - **Item Form:** Tablet - **Primary Supplement Type:** Vitamin C ## Images ![21st Century Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free - Image 1](https://m.media-amazon.com/images/I/61vgjRBMEeL.jpg) ![21st Century Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free - Image 2](https://m.media-amazon.com/images/I/71ekDaTu24L.jpg) ![21st Century Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free - Image 3](https://m.media-amazon.com/images/I/71u23CQW3OL.jpg) ![21st Century Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free - Image 4](https://m.media-amazon.com/images/I/713tK7sOVOL.jpg) ![21st Century Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free - Image 5](https://m.media-amazon.com/images/I/715CIA+gEIL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Does it contain soy** A: I checked the label and it doesn't. list 'soy' as such. **Q: Are these coated?** A: I don't take them anymore but I think they are a smooth tablet. **Q: I wanted the chewable tablets like it says on the description but I got the prolong lease like in the picture. Do you have the chewable ?** A: I have chewables **Q: Does anyone know the sugar content of these chewables? This is a factor for diabetics** A: the sugar content is not written on the bottle. I think you will have to go to the manufacturer for this information. ## Frequently Bought Together - 21st Century C 500 mg Prolonged Release Tablets, 110 Count (21190) - 21st Century Slow Release Iron Tablets, 60 Count - 21st Century B 50 Complex Prolonged Release Tablets, 60 Count (Pack of 1) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.dk/products/16943403-21st-century-vitamin-c-500mg-prolonged-release-tablets-immune-110ct](https://www.desertcart.dk/products/16943403-21st-century-vitamin-c-500mg-prolonged-release-tablets-immune-110ct) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-08-06*