Is Vitamin C Good For Stomach Problems


Vitamin C is a water-soluble vitamin that isn’t stored very well in the body. The Reference Nutrient Intake for vitamin C is set in the UK at 40mg, which is the amount for 97.5% of the population to ward off deficiency disease, rather than being recommended for optimum health.

An important thing to note is that our need for vitamin C demands change according to lifestyle factors – are we warding off an infection? Are we stressed? Do we smoke or are we exposed to other toxins.

How much is too much?

So, what is deemed a safe limit to avoid side effects? In the UK the FSA Expert Group on Vitamins and Minerals in 2003 stated that “there is insufficient data to set a Safe Upper Level for vitamin C” suggesting that the vitamin is safe at much higher levels than the current RNI. However, they do go on to say that intakes over 1,000mg might cause abdominal pain and diarrhoea (2). In the US, there is a big difference: the Safe Upper Levels are set at 2g per day, which is the dose at which they say mild stomach upset might occur (3).

Managing sensitive digestion

Higher doses of vitamin C can be a challenge for those with sensitive digestive systems, although many people taking high doses don’t have any issues at all. Research is divided as to what that level is – normally between 2-6g (2, 3). If stomach upset does occur, then reduce the supplement level and/or make sure you take the supplement with food or liquid. The addition of sodium bicarbonate to act as a buffer to the ascorbic acid (as in Tonic Health’s supplements) can help here too.

Ascorbic acid has long been established as the best bioavailable form of vitamin C in supplements, so for those of us without sensitive digestive systems – or who can find their manageable dose – it’s definitely the form of choice.

Vitamin C is a very important nutrient that’s abundant in many fruits and vegetables.

Getting enough of this vitamin is especially important for maintaining a healthy immune system. It also plays an important role in wound healing, keeping your bones strong, and enhancing brain function (1Trusted Source).

Interestingly, some claim that vitamin C supplements provide benefits beyond those that can be obtained from the vitamin C found in food.

One of the most common reasons people take vitamin C supplements is the idea that they help prevent the common cold (2Trusted Source).

However, many supplements contain extremely high amounts of the vitamin, which can cause undesirable side effects in some cases.

This article explores the overall safety of vitamin C, whether it’s possible to consume too much, and the potential adverse effects of taking large doses.

Vitamin C is water-soluble and not stored in your body

Vitamin C is a water-soluble vitamin, which means it dissolves in water.

In contrast to fat-soluble vitamins, water-soluble vitamins do not get stored within the body.

Instead, the vitamin C that you consume gets transported to your tissues via body fluids, and any extra gets excreted in urine (1Trusted Source).

Since your body does not store vitamin C or produce it on its own, it’s important to consume foods that are rich in vitamin C daily (1Trusted Source).

However, supplementing with high amounts of vitamin C can lead to adverse effects, such as digestive distress and kidney stones.

That’s because if you overload your body with larger-than-normal doses of this vitamin, it will start to accumulate, potentially leading to overdose symptoms (3Trusted Source).

It’s important to note that it’s unnecessary for most people to take vitamin C supplements, as you can easily get enough by eating fresh foods, especially fruits and vegetables

Symptoms of taking too much vitamin C

a person preparing fruit that may contain too much vitamin c
It is usually safe to frequently eat foods high in vitamin C.

Frequently eating foods high in vitamin C should not lead to any health issues. Taking too much vitamin C through supplements can, however, cause side effects.

In adults, the recommended dietary allowance (RDA)Trusted Source of vitamin C is 90 milligrams (mg) for males and 75 mg for females.

Adults who take more than 2,000 mg of vitamin C per day may experience side effects.

When a person takes more than the recommended limit of vitamin C, they may experience mild digestive disturbances. These can occur if the vitamin C that the body does not absorb irritates the gastrointestinal tract.

Common mild side effects of too much vitamin C include:

  • diarrhea
  • nausea
  • stomach cramping
  • bloating
  • general abdominal discomfort

The body does not absorb all of the vitamin C that it gets from supplements.

For example, if a person takes 30–180 mg of vitamin C each day, their body absorbs about 70–90%Trusted Source of this vitamin. If a person takes more than 1 gram (g) of vitamin C per day, the body absorbs less than 50% of the vitamin, which reduces the risk of negative side effects. The excess leaves the body in the urine.

How much vitamin C is too much?

As vitamin C can cause unpleasant symptoms if a person takes too much, the Food and Nutrition Board have established “tolerable upper intake levels.”

According to the Office of Dietary Supplements (ODS)Trusted Source, the upper limit for vitamin C intake in people aged 19 years and over is 2,000 mg in males and females. The limit remains the same for pregnant or breastfeeding women.

The upper daily vitamin C levels for children and infants are as follows:

  • 400 mg for infants aged 1–3 years
  • 650 mg for children aged 4–8 years
  • 1,200 mg for children aged 9–13 years
  • 1,800 mg for teenagers aged 14–18 years
  • 1,800 mg in pregnant or breastfeeding teenagers aged 14–18 years

There are exceptions to these limits, which only apply if a person’s doctor has not specified a different intake. Some people may have to take larger amounts of vitamin C for medical treatments.

Severe side effects

Less commonly, people may experience severe side effects from taking too much vitamin C. Long term intake above the recommended levels increases the risk of these negative effects.

Possible health risks of taking too much vitamin C include:

Kidney stones

a man suffering from back ache or kidney stones
Kidney stones are a possible consequence of too much vitamin C supplementation.

Doctors believe that too much vitamin C supplementation could result in a person excreting the compounds oxalate and uric acid in their urine. These compounds could lead to kidney stone formation.

The authors of a case study in the journal Kidney International reported that a woman developed kidney stones after taking 4 g or more of vitamin C each day for 4 months.

However, researchers have not conducted any larger scale studies on vitamin C intake and kidney stone formation. They do know that people who have a history of kidney stones are more likely to form them if they take large amounts of vitamin C, according to the ODSTrusted Source.

Nutrient imbalances

Another concern regarding excessive vitamin C intake is that it can impair the body’s ability to process other nutrients.

For example, vitamin C may reduce the levels of vitamin B-12 and copper in the body.

The presence of vitamin C can also enhance iron absorption in the body, which could lead to excessively high levels.

Cause bone spurs

According to the Arthritis Foundation, one study found that the presence of very high vitamin C levels in the body increased the likelihood of a person developing painful bone spurs.

However, the Foundation also cited a research study that found that people with low levels of vitamin C had a higher risk of developing rheumatoid arthritis, a painful inflammatory joint condition.

These findings emphasize the need for appropriate vitamin C supplementation that provides neither too much nor too little.

Impair the effectiveness of niacin-simvastatin

Evidence suggests that taking vitamin C supplements may impairTrusted Source the body’s ability to increase high density lipoprotein (HDL) cholesterol in people taking the combination drug niacin-simvastatin. This drug combines the vitamin niacin with the statin simvastatin (Zocor), and people take it to treat high cholesterol.

Doctors consider HDL cholesterol the “good” cholesterol because it reduces the amount of harmful cholesterol in the blood.

If a person takes vitamin C supplements and niacin-simvastatin, they should talk to their doctor about ways to make each more effective. Doctors do not know whether vitamin C also affects the ability of other medicines similar to Zocor.

How much vitamin C should I take?

A person’s body cannot make vitamin C, so people need to eat enough foods that contain vitamin C to meet their daily needs. If someone is at risk of a vitamin C deficiency, they can take vitamin C supplements.

The ODSTrusted Source advise aiming for the following RDA of vitamin C each day:

Age Male Female
1–3 years 15 mg 15 mg
4–8 years 25 mg 25 mg
9–13 years 45 mg 45 mg
14–18 years 75 mg 65 mg
19+ years 90 mg 75 mg

People who smoke should take 35 mg more vitamin C per day than those who do not smoke.

During pregnancy or when breastfeeding, women should get the following levels of vitamin C per day:

  • 14–18 years: 80 mg during pregnancy and 115 mg when breastfeeding
  • 19 years and older: 85 mg during pregnancy and 120 mg when breastfeeding

There is not enough research to suggest an RDA for vitamin C in those younger than 1 year of age. As a result, the ODS provide an “adequate intake,” which is the amount that is likely to be sufficient:

  • 40 mg for babies aged 0–6 months
  • 50 mg for infants aged 7–12 months

Vitamin C and pregnancy

a pregnant woman taking a supplement with a glass of water.
A pregnant woman may wish to take a vitamin C supplement if they have trouble getting enough from their diet.

Some doctors advocate women taking vitamin C supplements when pregnant.

A literature review in the Cochrane Database of Systematic Reviews looked into the effects of vitamin C supplementation during pregnancy.

The authors examined 29 studies that included 24,300 pregnant women. There was insufficient evidence for them to conclude that vitamin C helped prevent problems during pregnancy, such as stillbirth, preterm birth, or preeclampsia.

However, pregnant women should try to get enough vitamin C through their daily diets when pregnant. Foods high in vitamin C include:

  • broccoli
  • kiwifruit
  • oranges
  • strawberries
  • tomatoes

If a woman has trouble meeting her daily requirements, she should talk to her doctor about supplementation.

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