Because of the potential for side effects and drug interactions, you should only take dietary supplements under the supervision of an experienced healthcare provider. Vitamin C supplements have a diuretic effect, that is, they help the body get rid of excess fluid. The dose you need may be different during pregnancy or while you are breastfeeding a baby. Do not use ascorbic acid without your doctor's advice in either case.
It's safe to take vitamin C in the recommended amounts at any time of the day. It's found naturally in a variety of plant products, including orange juice, grapefruit, and lemons. However, most vitamins have no known adverse effects for most people. That said, people who regularly take prescription or over-the-counter medications should consult their doctor before taking any vitamin supplement.
While taking a general “broad spectrum” vitamin and mineral supplement “just in case” poses few health risks and may benefit a person with a restricted and unvaried diet, taking vitamin and mineral supplements instead of following a nutritious diet is not recommended.
