The United States spent $1.4 billion in the second quarter of 2019 on vitamin C supplements, up $1 billion from the first quarter, according to an analysis of government data by The Associated Press.
The U.S. spent nearly $1 trillion on the same period a year earlier.
The data shows a sharp rise in supplemental use since a 2015 recession.
About 3.4 million Americans received vitamin C in the past year, according the government.
But that figure doesn’t account for the estimated 3.2 million people who got only the recommended amount, the lowest level of intake for vitamin C for more than five years.
The number of Americans who didn’t receive enough vitamin C to meet their daily requirements for a week in the first six months of 2019 fell by about 50 percent from the same time a year before, the data shows.
Some of the decline was driven by people who missed the recommended dose, or for whom it wasn’t clear how much to take.
Many of the vitamin C prescriptions are for people who have had a medical condition that caused a worsening of their health, such as kidney disease or heart disease.
Some people who don’t take enough of the recommended daily dose may be prescribed supplements that don’t contain vitamin C. And the data doesn’t take into account the growing use of oral calcium supplements, which may help to increase the number of people who get enough.
People who don’t take vitamin C may not get enough calcium, and it could increase the risk of bone fractures.
Vitamin C is also used in supplements and in the body to prevent kidney stones, but many people don’te need more than the recommended level to get the benefits.
The AP analyzed data from the U.T.S., a nonprofit research group based in New York.
Vitamin A, vitamin B6, vitamin D and riboflavin are also important nutrients for good bones.
Some research suggests that people who take enough vitamin A to meet the recommended vitamin C intake are more likely to have good bones, although the relationship isn’t completely clear.
The Associated AP obtained the data from government agencies, companies and health care providers.
The findings are based on publicly available reports from U.N. agencies, research published in peer-reviewed journals and information from the Food and Drug Administration.
The USDA and the Centers for Disease Control and Prevention said in their statements that they had no information about the use of supplemental vitamin C and did not endorse the analysis.
Vitamin D, an important vitamin, has also increased over the past decade and could help people with lower levels of vitamin D. The World Health Organization recommends a daily intake of 25 milligrams of vitamin A and vitamin D for adults.
In some people, vitamin A can be absorbed from food, and people may take more than 25 milligs of vitamin a day, which is considered too much.
About 2.2 billion Americans get their vitamin D from food sources, including milk, fortified foods and some supplements.
The FDA has set the daily limit for vitamin D, which includes the amount of vitamin B12 a person should get from foods.
But there is no federal standard for the amount people should take.