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How much vitamin C per day is toxic?

The upper limit for all adults is 2,000 mg a day. Although too much dietary vitamin C is unlikely to be harmful, large doses of vitamin C supplements might cause: Diarrhea. Nausea.

mayoclinic.org - Too much vitamin C: Is it harmful? - Mayo Clinic

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Is it possible to take too much vitamin C? Answer From Katherine Zeratsky, R.D., L.D. Vitamin C is an essential nutrient. But you can get too much of it. Vitamin C (ascorbic acid) is a water-soluble vitamin that supports growth and development. It also helps your body absorb iron. Because your body doesn't make or store vitamin C, it's important to include vitamin C in your diet. Most people can get enough vitamin C for the day in their food. An orange or a cup of strawberries, chopped red pepper or broccoli provides enough vitamin C for the day. The recommended daily amount for vitamin C is 75 milligrams (mg) a day for women and 90 mg a day for men. During pregnancy, 120 mg a day are recommended. The upper limit for all adults is 2,000 mg a day. Although too much dietary vitamin C is unlikely to be harmful, large doses of vitamin C supplements might cause:

Diarrhea

Nausea

Vomiting

Heartburn

Stomach (abdominal) cramps

Headache

Remember, for most people, a healthy diet provides enough vitamin C.

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Can vitamin C make wrinkles worse?

Vitamin C is a powerful ingredient in many anti-aging products. Some studies show that it can reduce the appearance of wrinkles when you use it for at least 12 weeks. A healthy diet that's high in this nutrient might help, too. Research suggests that people who eat more vitamin C have fewer wrinkles.

webmd.com - The Benefits of Vitamin C for Your Skin - WebMD

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Oregon State University Linus Pauling Institute: “Vitamin C and Skin Health.”

American Osteopathic College of Dermatology: “Hyperpigmentation.”

The Journal of Clinical and Aesthetic Dermatology: “Topical Vitamin C and the Skin: Mechanisms of Action and Clinical Applications.” Harvard Health Publishing/Harvard Medical School: “Skin Serum: What it Can and Can’t do.” The American Journal of Clinical Nutrition: “Dietary Nutrient Intakes and Skin-aging Appearance Among Middle-aged American Women.”

Cedars-Sinai: “Collagen for Your Skin: Healthy or Hype?”

Nutrients: “The Roles of Vitamin C in Skin Health.”

Harvard Health Publishing/Harvard Medical School: “Finding the Right Serum for Your Skin.”

Cleveland Clinic: “Understanding the Ingredients in Skin Care Products.”

National Institutes of Health Office of Dietary Supplements: “Vitamin C Fact Sheet for Health Professionals.”

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