--- product_id: 16943403 title: "Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct" brand: "21st century" price: "452482₫" currency: VND in_stock: true reviews_count: 13 category: "21st Century" url: https://www.desertcart.vn/products/16943403-vitamin-c-500mg-prolonged-release-tablets-immune-110ct store_origin: VN region: Vietnam --- # Prolonged release for steady absorption Gluten-free, vegan, no artificial additives 500mg Vitamin C antioxidant boost Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct **Brand:** 21st century **Price:** 452482₫ **Availability:** ✅ In Stock ## Summary > 🛡️ Stay ahead with steady Vitamin C power—because your immune system deserves the best! ## Quick Answers - **What is this?** Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct by 21st century - **How much does it cost?** 452482₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/16943403-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 - • **Smart Supplementing:** 110 tablets per bottle means long-lasting supply for consistent daily wellness without compromise. - • **All-Day Immune Shield:** Slow-release formula delivers Vitamin C steadily, maximizing absorption and immune defense throughout your busy day. - • **Pure & Clean Wellness:** No added sugar, salt, yeast, preservatives, or artificial flavors—just clean, vegan-friendly nutrition you can trust. - • **Trusted Quality Since 1990s:** Manufactured by 21st Century HealthCare with 30+ years of expertise and guaranteed label potency. - • **Powerful Antioxidant Support:** 500mg Vitamin C helps neutralize free radicals, supporting cellular health and resilience. ## Overview 21st Century Vitamin C 500mg Prolonged Release Tablets provide a scientifically designed slow-release formula that delivers antioxidant and immune support throughout the day. With 110 gluten-free, vegan tablets free from artificial additives, this trusted supplement from a 30-year industry leader ensures pure, effective Vitamin C absorption to keep you feeling resilient and energized. ## 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. Review: Time Release is better. - Prolonged release or time release is a good thing for many vitamins. It's getting the C over a space of a few hours vs getting all 500mg all at once and pissing it out before you can absorb it. I've been buying this brand for years and C is a good anti-oxident in general, not just for colds or cold season. Review: Quality product, good price point. - Extended release Vitamin C is the only way to go. Your body can only absorb so much at a time, and I don't need to waste money. Consistently high quality at a competitive price. I will buy again! ## 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 | | Age Range Description | Adult | | Allergen Information | Gluten Free | | Best Sellers Rank | #60,573 in Health & Household ( See Top 100 in Health & Household ) #356 in Vitamin C Supplements | | Brand | 21st Century | | Brand Name | 21st Century | | Color | No Color | | Container Type | Bottle | | Customer Reviews | 4.6 out of 5 stars 397 Reviews | | 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 Highlight | Vitamin C 500 mg Time-Release Tablets, Immune & Antioxidant Support, Steady All-Day Release, Gluten Free | | Item Weight | 4.16 ounces | | 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 | | 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 ![Vitamin C 500mg Prolonged Release Tablets, Immune, 110ct - Image 1](https://m.media-amazon.com/images/I/61vgjRBMEeL.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Time Release is better. *by J***E on August 12, 2026* Prolonged release or time release is a good thing for many vitamins. It's getting the C over a space of a few hours vs getting all 500mg all at once and pissing it out before you can absorb it. I've been buying this brand for years and C is a good anti-oxident in general, not just for colds or cold season. ### ⭐⭐⭐⭐⭐ Quality product, good price point. *by N***. on November 4, 2025* Extended release Vitamin C is the only way to go. Your body can only absorb so much at a time, and I don't need to waste money. Consistently high quality at a competitive price. I will buy again! ### ⭐⭐⭐⭐⭐ 21st Century prolonged release Vitaminas C *by A***O on September 27, 2025* Recommended by Pharmacist due to excellent quality product. Easy to swallow, good value for price and larger bottles available on Amazon than in Pharmacy. ## 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.vn/products/16943403-vitamin-c-500mg-prolonged-release-tablets-immune-110ct](https://www.desertcart.vn/products/16943403-vitamin-c-500mg-prolonged-release-tablets-immune-110ct) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-10-07*