Ester C 9444 mg SuperSmart 7200 mg 9000% Capsule Amazon Pure C Crystals Nature's Life 5000 mg 8333% Powder Amazon Vitamin C Powder 5000 mg Solaray 5000 mg 5556% Powder Amazon Pure Vitamin C Crystals 5000 mg Vitamin World 5000 mg 8333% Powder Amazon Vitamin C Micro-Crystals NaturesPlus 5000 mg 5556% Other (e.g. tea bag) Amazon Vitamin C Crystals Bluebonnet 4500 mg 5000% Powder Amazon Effervescent Vitamin C Magnesium Crystals Life Extension 4500 mg 5000% Powder Amazon Buffered C Crystals Bluebonnet 4100 mg 4556% Other (e.g. tea bag) Amazon Buffered Vitamin C Powder Life Extension 4000 mg 4444% Powder Amazon C Aspa Scorb ● OTHER INGREDIENTS (1) Progressive Professional from Progressive Laboratories 4000 mg 6667% Powder Amazon Vitality C AN American Nutriceuticals 4000 mg 6666% Powder Amazon Alka-C ● OTHER INGREDIENTS (1) Energetix 4000 mg 6667% Powder Amazon C-Ascorbs Sustained Release ● OTHER INGREDIENTS (2) NaturesPlus 4000 mg 4444% Tablet or Pill Amazon Vital C Crystal Powder TriVita 4000 mg 6667% Powder Amazon Vitamin C Crystals Douglas Laboratories 4000 mg 4444% Powder Amazon Vitamin C Fine Powder, USP Douglas Laboratories 4000 mg 6667% Powder Amazon Calscorbplex Powdered Ascorbate Complex Douglas Laboratories 4000 mg 6667% Powder Amazon Buffer-C ● OTHER INGREDIENTS (1) MBi Nutraceuticals 4000 mg 6666% Liquid Amazon First Response Citrus Orange NutraBio 3000 mg 3330% Powder Amazon C-3000 Complex ● OTHER INGREDIENTS (1) MBi Nutraceuticals 3000 mg 5000% Powder Amazon Ortho C+ Lemon Flavor ● OTHER INGREDIENTS (3) AOR Advanced Orthomolecular Research Premium 3000 mg 3333% Powder Amazon Mega-Liposomal Vitamin C 3000 mg Organic Fruit Flavor ● OTHER INGREDIENTS (2) Aurora NutraScience 3000 mg 5000% Liquid Amazon Mega-Pack+ Vitamin C 3000 mg ● OTHER INGREDIENTS (1) Aurora NutraScience 3000 mg 3333% Liquid Amazon Anti-Alcohol Antioxidants With HepatoProtection Complex ● OTHER INGREDIENTS (2) Life Extension 3000 mg 5000% Capsule Amazon C-500 ● OTHER INGREDIENTS (3) Optimox 3000 mg 5000% Tablet or Pill Amazon Ultra Preventive Forte-Chel ⚠ EXCEEDS UL (3) ● OTHER INGREDIENTS (2) Douglas Laboratories 3000 mg 5000% Tablet or Pill Amazon Mega-Liposomal Vitamin C 3000 mg ● OTHER INGREDIENTS (2) Aurora Nutrascience 3000 mg 5000% Liquid Amazon Ultra Preventive Forte-Chel (Capsules) ⚠ EXCEEDS UL (3) ● OTHER INGREDIENTS (2) Douglas Laboratories 3000 mg 5000% Capsule Amazon Buffered C Powder Natural Fruit Punch Flavor XYMOGEN 3000 mg 3333% Powder Amazon Triple C SuperSmart 2928.9 mg 3660% Capsule Amazon Mixed Ascorbate Powder Biotics Research Corporation 2767 mg 4612% Powder Amazon C-Care Powder Karuna 2600 mg 4333% Powder Amazon Optimal Vitamin C Plus Seeking Health 2600 mg 2889% Powder Amazon C Plus Bioflavonoids Fizz Orange Flavor ● OTHER INGREDIENTS (1) Adaptogen Research 2569 mg 4280% Liquid Amazon C + BioFizz ● OTHER INGREDIENTS (1) Designs for Health 2569 mg 4280% Powder Amazon Vitamin C Crystals Country Life 2500 mg 2778% Powder Amazon Liposomal Immune Boost 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