Too much vitamin C: Is it harmful? - Mayo Clinic
2022年4月28日 · 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 ...
Vitamin C - Mayo Clinic
2023年8月10日 · Vitamin C is found in citrus fruits, berries, potatoes, tomatoes, peppers, cabbage, Brussels sprouts, broccoli and spinach. Vitamin C is also available as an oral supplement, typically in the form of capsules and chewable tablets. Most people get enough vitamin C from a healthy diet. Vitamin C deficiency is more likely in people who:
Ascorbic acid (oral route) - Mayo Clinic
The daily amount of vitamin C needed is defined in several different ways. For U.S.— Recommended Dietary Allowances (RDAs) are the amount of vitamins and minerals needed to provide for adequate nutrition in most healthy persons.
Vitamin D - Mayo Clinic
2023年8月10日 · Vitamin D supplements are used to treat adults with severe vitamin D deficiency, resulting in loss of bone mineral content, bone pain, muscle weakness and soft bones (osteomalacia). Osteoporosis. Studies suggest that people who get enough vitamin D and calcium in their diets can slow bone mineral loss, help prevent osteoporosis and reduce bone ...
Vitamin B-12 - Mayo Clinic
2024年6月28日 · The recommended daily amount of vitamin B-12 for adults is 2.4 micrograms (mcg). Most people can get enough vitamin B-12 in the foods they eat. But people who follow a vegetarian or vegan diet should eat nutritional yeast and other foods fortified with vitamin B-12. Or they can take a low-dose multivitamin that includes 2.4 mcg of vitamin B-12.
High-dose vitamin C: Can it kill cancer cells? - Mayo Clinic
2023年12月15日 · Despite the lack of evidence, some alternative medicine practitioners continue to recommend high doses of vitamin C for cancer treatment. More recently, vitamin C given through a vein (intravenously) has been found to have different effects than …
Do the benefits of vitamin C include improved mood? - Mayo Clinic
2022年10月8日 · In some studies, participants reported that vitamin C lowered their anxiety levels. More research is needed. But in the meantime, eat plenty of fruits and vegetables rich in vitamin C, such as oranges and red peppers. If you also take a supplement, try not to exceed the upper limit of 2,000 milligrams of vitamin C a day.
Beta carotene (oral route) - Mayo Clinic
2024年1月31日 · Adults and teenagers—75 to 180 mg of beta-carotene (the equivalent of 125,000 to 300,000 Units of vitamin A activity) a day. Children—30 to 150 mg of beta-carotene (the equivalent of 50,000 to 250,000 Units of vitamin A activity) a day. If you have high blood levels of vitamin A, your body will convert less beta-carotene to vitamin A.
Zinc supplement (oral route, parenteral route) - Mayo Clinic
2024年8月1日 · To prevent deficiency, the amount taken by mouth is based on normal daily recommended intakes (Note that the normal daily recommended intakes are expressed as an actual amount of zinc. The dosage form [e.g., zinc gluconate, zinc sulfate] has a different strength): For the U.S. Adult and teenage males—15 milligrams (mg) per day.
Vitamin A - Mayo Clinic
This weight-loss drug can decrease the absorption of food sources of vitamin A. Your doctor might suggest that you take a multivitamin with vitamin A and beta-carotene while taking this medication. Retinoids. Don't use vitamin A supplements and these oral prescription drugs at the same time. This could increase the risk of high vitamin A blood ...