Vitamin C is an important nutrient that our bodies need since it is obtained mainly from food, as well as in supplement form as ascorbic acid. That is because humans are one of the few mammals that do not produce this water-soluble vitamin on their own, and so it must be ingested regularly. It is best known for boosting the immune system, which is currently what we need to prevent ourselves from getting infected by viruses as lethal as the COVID-19 coronavirus.

Though the recommended doses vary from person to person, the highest allowable daily dose of vitamin C for adults is from 300 to 1000 milligrams for one month, according to the 

University of Rochester. It is important to note that too much of this vitamin can cause diarrhea, nausea and stomach pain, and that the vitamin itself does not guarantee protection from the coronavirus. However, in addition to boosting immune function, vitamin C taken by mouth can effectively cure scurvy.

Vitamin C in supplement form is your best bet if you are practicing a diet low in fruits and vegetables, have a prolonged sickness, go outside to work or do exercises, have too much emotional and mental stress, and/or have other conditions that can increase your risk of getting sick with COVID-19. Without further ado, here are the best 1000mg vitamin C tablets currently available on Amazon:

1. Solgar Ester-C Plus
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Available in bottles of 30, 90, and 180 tablets on Amazon, Solgar Ester-C Plus has vitamin C metabolites that can positively impact retention of vitamin C present in your cells. These metabolites, which are made from natural bioflavonoids, acerola berry, and rose hip powder, provide beneficial antioxidant and immune system support.

2. Country Life Buffered Vitamin C
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Aside from 1000 milligrams of vitamin C together with rose hips, the Country Life Buffered Vitamin C tablets are also packed with 105mg of lemon peel-based bioflavonoids, along with 200 milligrams of bone-strengthening calcium and 12 milligrams of magnesium, which aids both in blood pressure and your immune health.

3. Best Naturals C-1000
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Best Naturals C-1000 tablets are made from 1000 milligrams of high-quality vitamin C (as ascorbic acid), rose hips, and bioflavonoids -- which include fruit-based rutin, and acerola cherries. Packed with 240 tablets per bottle, it does not only support your immunity, but also heart, circulatory and even eye health.

4. Amazing Formulas Vitamin C With Rose Hips by Amazing Nutrition
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With 240 tablets in each bottle, Amazing Nutrition Amazing Formulas Vitamin C With Rose Hips dietary tablets contain 1000 milligrams of vitamin C along with over 60 milligrams of rose hip extract. Studies have found that 1000mg of vitamin C is better absorbed and utilized with rose hips.

5. Bronson Vitamin C Pure Ascorbic Acid
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In stock on April 23, Bronson Vitamin C Pure Ascorbic Acid tablets are packed with 1000 milligrams of vitamin C (in ascorbic acid form) that helps not only in immune system health, but also in antioxidant protection, while supporting production of collagen which contributes to healthy skin and joints.

6. 21st Century Vitamin C 1000mg
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Now packed with 110 tablets per bottle (from the previous 100), 21st Century Vitamin C 1000mg helps neutralize free radicals in your body while supporting a healthy immune system. Each tablet contains 1000 milligrams of vitamin C along with over 50 grams of calcium, which aids in bone health, among other ingredients.

7. Now Buffered Vitamin C-1000 Complex
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In stock on April 25, the Now Buffered Vitamin C-1000 Complex has antioxidant protection to back up its immune health-boosting properties. Each tablet is packed with 1000 milligrams of vitamin C and 250 milligrams of bioflavonoids, in addition to 100 milligrams of calcium and 50 milligrams each of acerola and rutin powders.

8. Airborne Original Very Berry
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Airborne Very Berry Chewable Tablets are packed with enough vitamin C per serving (1000mg) to support your immune system. These easy-to-take berry-flavored tablets are also high in antioxidants such as vitamins A, C and E, and are excellent sources of zinc, selenium, manganese and magnesium.

9. Endur-C by Endurance Products
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Available in bottles of 150 and 300 for the 1000mg option, the Endur-C tablet utilizes sustained-release technology that allows it to melt at stomach temperature over 5 to 7 hours, steadily releasing vitamin C to promote optimal absorption for maximum effectiveness. Aside from supporting immune function, it also helps combat free radicals and reactivates the antioxidant vitamin E.

10. Swisse Vitamin C + Manuka Honey
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The Swisse Vitamin C + Manuka Honey dietary supplement is made from natural high-quality ingredients, including New Zealand-harvested Manuka honey, lemon and acerola cherry extract. Available in bottles of 120 and 240 tablets, each chewable tablet is naturally rich in antioxidants with immunity-boosting benefits.