You will benefit much more from taking a vitamin C supplement that is non–synthetic. In other words: a food-based supplement. Most Vitamin C supplements are simply ascorbic acid, which is only about 1/12 of the complete vitamin C complex that you will get in food or a food–based supplement.
Synthetically-produced ascorbic acid can actually introduce problems. According to a 2012 study from the Women’s Heart Center at Cedars-Sinai Heart Institute:
Taken on a long-term basis, ascorbic acid has been found to cause atherosclerosis (hardening of the arteries), cause the breakdown of collagen in the arteries, kidney stones and more health problems.
Plus, ascorbic acid is 10 times more acidic than naturally-buffered vitamin C. It can cause stomach upset and leech minerals from bones.
I’m aware of the long-standing work of Linus Pauling and Orthomolecular Medicine, using high dose ascorbic acid medicinally to treat disease, including cancer. This differs from taking whole food Vitamin C to prevent disease.
Only about 5 of the hundreds of companies that sell vitamins in the U.S. produce whole food vitamins. Why? Because, whole food vitamins are expensive to produce.
So, over 90% of ascorbic acid in the U.S. is manufactured at a facility owned by one of the world’s biggest drug manufacturers, using a process involving cornstarch and volatile acids. Most U.S. vitamin companies then buy the bulk of ascorbic acid from this single facility.