Too much vitamin C: Is it harmful? - Mayo Clinic
网页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 …
Vitamin C - Mayo Clinic
网页2023年8月10日 — Vitamin C (ascorbic acid) is a nutrient your body needs to form blood vessels, cartilage, muscle and collagen in bones. Vitamin C is also vital to your body's healing process. Vitamin C is an antioxidant that helps protect your cells against the effects of free radicals — molecules produced when your body breaks down food or is exposed to ...
Vitamin B-12 - Mayo Clinic
网页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 …
Calcium and calcium supplements: Achieving the right balance
网页2022年11月1日 — Common calcium supplements may be labeled as: Calcium carbonate (40% elemental calcium) Calcium citrate (21% elemental calcium) Calcium gluconate (9% elemental calcium) Calcium lactate (13% elemental calcium) The two main forms of calcium supplements are carbonate and citrate. Calcium carbonate is cheapest and therefore often a good first choice.
Do the benefits of vitamin C include improved mood? - Mayo Clinic
网页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.
Ascorbic Acid (Oral Route) Proper Use - Mayo Clinic
网页2024年8月1日 — Ascorbic acid, also known as vitamin C, is necessary for wound healing. It is needed for many functions in the body, including helping the body use carbohydrates, fats, and protein. Vitamin C also strengthens blood vessel walls. Lack of vitamin C can lead to a condition called scurvy, which causes muscle weakness, swollen and bleeding gums ...
Beta Carotene (Oral Route) Proper Use - Mayo Clinic
网页For use as a dietary supplement: For oral dosage forms (capsules or chewable tablets): Adults and teenagers: 6 to 15 milligrams (mg) of beta-carotene (the equivalent of 10,000 to 25,000 Units of vitamin A activity) per day. Children: 3 to 6 mg of beta-carotene (the equivalent of 5,000 to 10,000 Units of vitamin A activity) per day. For other uses:
Methenamine (Oral Route) Proper Use - Mayo Clinic
网页For oral dosage form (methenamine hippurate tablets): Adults and children 12 years of age and over—1 gram two times a day. Take in the morning and the evening. Children up to 6 years of age—Use and dose must be determined by your doctor. Children 6 to 12 years of age—500 milligrams (mg) to 1 gram two times a day.
Vitamin D - Mayo Clinic
网页2023年8月10日 — Vitamin D is a nutrient your body needs for building and maintaining healthy bones. That's because your body can only absorb calcium, the primary component of bone, when vitamin D is present. Vitamin D also regulates many other cellular functions in your body. Its anti-inflammatory, antioxidant and neuroprotective properties support immune ...
High-dose vitamin C: Can it kill cancer cells? - Mayo Clinic
网页2023年12月15日 — Interest in using very high doses of vitamin C as a cancer treatment began as long ago as the 1970s when it was discovered that some properties of the vitamin may make it toxic to cancer cells. Initial studies in humans had promising results, but these studies were later found to be flawed. Subsequent well-designed, randomized, controlled ...