| Ester C 9444 mg | SuperSmart | 7200 mg | 9000% | Capsule |
| Pure C Crystals | Nature's Life | 5000 mg | 8333% | Powder |
| Vitamin C Powder 5000 mg | Solaray | 5000 mg | 5556% | Powder |
| Pure Vitamin C Crystals 5000 mg | Vitamin World | 5000 mg | 8333% | Powder |
| Vitamin C Micro-Crystals | NaturesPlus | 5000 mg | 5556% | Other (e.g. tea bag) |
| Vitamin C Crystals | Bluebonnet | 4500 mg | 5000% | Powder |
| Effervescent Vitamin C Magnesium Crystals | Life Extension | 4500 mg | 5000% | Powder |
| Buffered C Crystals | Bluebonnet | 4100 mg | 4556% | Other (e.g. tea bag) |
| Buffered Vitamin C Powder | Life Extension | 4000 mg | 4444% | Powder |
| C Aspa Scorb | Progressive Professional from Progressive Laboratories | 4000 mg | 6667% | Powder |
| Vitality C | AN American Nutriceuticals | 4000 mg | 6666% | Powder |
| Alka-C | Energetix | 4000 mg | 6667% | Powder |
| C-Ascorbs Sustained Release | NaturesPlus | 4000 mg | 4444% | Tablet or Pill |
| Vital C Crystal Powder | TriVita | 4000 mg | 6667% | Powder |
| Vitamin C Crystals | Douglas Laboratories | 4000 mg | 4444% | Powder |
| Vitamin C Fine Powder, USP | Douglas Laboratories | 4000 mg | 6667% | Powder |
| Calscorbplex Powdered Ascorbate Complex | Douglas Laboratories | 4000 mg | 6667% | Powder |
| Buffer-C | MBi Nutraceuticals | 4000 mg | 6666% | Liquid |
| First Response Citrus Orange | NutraBio | 3000 mg | 3330% | Powder |
| C-3000 Complex | MBi Nutraceuticals | 3000 mg | 5000% | Powder |
| Ortho C+ Lemon Flavor | AOR Advanced Orthomolecular Research Premium | 3000 mg | 3333% | Powder |
| Mega-Liposomal Vitamin C 3000 mg Organic Fruit Flavor | Aurora NutraScience | 3000 mg | 5000% | Liquid |
| Mega-Pack+ Vitamin C 3000 mg | Aurora NutraScience | 3000 mg | 3333% | Liquid |
| Anti-Alcohol Antioxidants With HepatoProtection Complex | Life Extension | 3000 mg | 5000% | Capsule |
| C-500 | Optimox | 3000 mg | 5000% | Tablet or Pill |
| Ultra Preventive Forte-Chel | Douglas Laboratories | 3000 mg | 5000% | Tablet or Pill |
| Mega-Liposomal Vitamin C 3000 mg | Aurora Nutrascience | 3000 mg | 5000% | Liquid |
| Ultra Preventive Forte-Chel (Capsules) | Douglas Laboratories | 3000 mg | 5000% | Capsule |
| Buffered C Powder Natural Fruit Punch Flavor | XYMOGEN | 3000 mg | 3333% | Powder |
| Triple C | SuperSmart | 2928.9 mg | 3660% | Capsule |
| Mixed Ascorbate Powder | Biotics Research Corporation | 2767 mg | 4612% | Powder |
| C-Care Powder | Karuna | 2600 mg | 4333% | Powder |
| Optimal Vitamin C Plus | Seeking Health | 2600 mg | 2889% | Powder |
| C Plus Bioflavonoids Fizz Orange Flavor | Adaptogen Research | 2569 mg | 4280% | Liquid |
| C + BioFizz | Designs for Health | 2569 mg | 4280% | Powder |
| Vitamin C Crystals | Country Life | 2500 mg | 2778% | Powder |
| Liposomal Immune Boost | Sunfood Superfoods | 2400 mg | 4000% | Liquid |
| Buffered Lemon C Powder | Ortho Molecular Products | 2350 mg | 2611% | Powder |
| Buffered C Powder Natural Berry Flavor | Advanced Nutrition by Zahler | 2350 mg | 2611% | Powder |
| Vitamin C Pure Powder | Best Naturals | 2250 mg | 2500% | Powder |
| Keto Drive Matcha Lemonade | ZHOU | 2010 mg | 2233% | Powder |
| Life Extenstion Mix Capsules | Life Extension | 2000 mg | 3333% | Capsule |
| Ultra-C 2000 mg Sustained Release | NaturesPlus | 2000 mg | 2222% | Tablet or Pill |
| Vitamin C 1000 mg | Vital Nutrients | 2000 mg | 2222% | Capsule |
| Super Pak | Beverly International | 2000 mg | 2222% | Other (e.g. tea bag) |
| Life Extenstion Mix Powder | Life Extension | 2000 mg | 3333% | Powder |
| Life Extenstion Mix Capsules Without Copper | Life Extension | 2000 mg | 3333% | Capsule |
| Mercury Amalgam Formula | Douglas Laboratories | 2000 mg | 3333% | Capsule |
| Buffered C 2500 mg Powder | DC | 2000 mg | 2222% | Powder |
| Vitamin C 1000 mg | NutraMedix | 2000 mg | 2222% | Capsule |
| Life Extenstion Mix Tablets Without Copper | Life Extension | 2000 mg | 3333% | Tablet or Pill |
| Life Extension Mix Powder Without Copper | Life Extension | 2000 mg | 3333% | Powder |
| Vital Mixed Ascorbates (with Natural Fruit Antioxidants) | Pharmax | 2000 mg | 3333% | Powder |
| Life Extension Mix Tablets With Extra Niacin | Life Extension | 2000 mg | 3333% | Tablet or Pill |
| Life Extension Mix Tablets Without Copper | Life Extension | 2000 mg | 3333% | Tablet or Pill |
| Vitamin C Crystals 2000 mg with Rose Hips | GNC | 2000 mg | 2222% | Powder |
| Liposomal Vitamin C Complex 2032 mg | NusaPure | 2000 mg | 2222% | Capsule |
| C/Lysine Plus | Douglas Laboratories | 2000 mg | 2222% | Capsule |
| Life Extenstion Mix Tablets | Life Extension | 2000 mg | 3333% | Tablet or Pill |
| Life Extenstion Mix Powder Without Copper | Life Extension | 2000 mg | 3333% | Powder |
| Keto Drive Orange Mango | ZHOU | 2000 mg | 2222% | Powder |
| Spectra Infinite Nutrition | DaVinci Laboratories | 2000 mg | 2222% | Powder |
| Ascorbic Acid with Bioflavonoids | NutriBiotic Immunity | 2000 mg | 2222% | Powder |
| Collagen Forte | Douglas Laboratories | 2000 mg | 2222% | Capsule |
| Life Extenstion Mix Tablets With Extra Niacin | Life Extension | 2000 mg | 3333% | Tablet or Pill |
| Ultimate Ascorbate C 1,000 mg | Source Naturals | 2000 mg | 2222% | Tablet or Pill |
| Ascorbic Acid 100% Pure Vitamin C | NutriBiotic Immunity | 2000 mg | 2222% | Powder |
| Pure Vitamin C Powder | Allergy Research Group | 2000 mg | 3333% | Powder |
| Vitamin C Buffered Powder | Designs for Health | 2000 mg | 3330% | Powder |
| Elite Athlete | Cooper Complete | 2000 mg | 3333% | Tablet or Pill |
| Vitamin C | NutraMedix | 2000 mg | 3333% | Capsule |
| Vitamin C From Tapioca | Ecological Formulas | 2000 mg | 2220% | Powder |
| C-2000 Complex 2000 mg | The Vitamin Shoppe | 2000 mg | 3333% | Tablet or Pill |
| Ester C Powder 2500 mg | DC | 2000 mg | 2222% | Powder |
| Keto Drive Revved Black Cherry | ZHOU | 1975 mg | 2194% | Powder |
| Elan Vital Multiple | Source Naturals | 1880 mg | 3133% | Tablet or Pill |
| Vita Chel Pack | Douglas Laboratories | 1867 mg | 3112% | Tablet or Pill |
| Basic Antiox | Douglas Laboratories | 1860 mg | 3100% | Other (e.g. tea bag) |
| Cardio Pro | Progressive Professional from Progressive Laboratories | 1850 mg | 3083% | Powder |
| Immunity Support Peach Mint Flavored | Bowmar Nutrition | 1800 mg | 2000% | Powder |
| Vitamin C Ascorbates | Nature's Sunshine | 1800 mg | 2000% | Powder |
| Sodium Ascorbate Vitamin C Powder 2000 mg | BulkSupplements.com | 1780 mg | 1978% | Powder |
| Sodium Ascorbate | BulkSupplements.com | 1780 mg | 1978% | Powder |
| Calcium Ascorbate | NutriBiotic Immunity | 1760 mg | 1960% | Powder |
| Men's Complete (No Iron) | Priority One Nutritional Supplements | 1755 mg | 1950% | Capsule |
| Multi Complex | Priority One Nutritional Supplements | 1752 mg | 1947% | Capsule |
| Premium Liposomal Vitamin C 1650 mg | Nutrivein | 1650 mg | 1833% | Capsule |
| Liposomal Vitamin C 1,650 mg | Nature's Truth | 1650 mg | 1833% | Softgel Capsule |
| Vitamin C Powder | BioCare | 1606 mg | 2008% | Powder |
| Mild-C 1,600 mg | Carlson | 1600 mg | 1778% | Powder |
| Vita-Chel Plus | Douglas Laboratories | 1600 mg | 2667% | Tablet or Pill |
| Prosta-Pro Support Pack | Douglas Laboratories | 1600 mg | 2667% | Other (e.g. tea bag) |
| Liposomal Vitamin C 1600 mg | NutriFlair | 1600 mg | 1778% | Capsule |
| Vitamin C Buffered Powder | Beyond Health | 1600 mg | 1780% | Powder |
| Vitamin C 1500 mg with Rose Hips | Solgar | 1500 mg | 1667% | Tablet or Pill |
| Vitamin C 1500 mg With Rose Hips | Solgar | 1500 mg | 1667% | Tablet or Pill |
| Mega Vita-Min | DC | 1500 mg | 2500% | Other (e.g. tea bag) |
| Immuni-V Cherry Effervescent | MRI Performance | 1500 mg | 1667% | Powder |
| Immuni-V Sour Apple Effervescent | MRI Performance | 1500 mg | 1667% | Powder |
| C-1500 Complex 1500 mg | The Vitamin Shoppe | 1500 mg | 2500% | Tablet or Pill |