Vitamin C Side Effects and the Risks of Excess Vitamin C
Too much vitamin C can negatively impact your body if it is regularly consumed in supplement form beyond what the body needs. Vitamin C is great for boosting your immunity and overall health, but taking high doses isn't always going to add extra benefits. In fact, too much may lead to digestive discomfort and other health issues.
With vitamin C supplements getting popular for skin, hair and immunity, it's worth knowing how much is too much. A vitamin C deficiency makes you experience symptoms like bleeding gums, easy bruising and poor wound healing, and in really bad cases, it can even lead to scurvy. Most people get enough through a balanced diet without having to rely on supplements.
This guide aims to look into the possible side effects of vitamin C, the safe daily intake, health risks and so on.
Read on to know more.
What Is Vitamin C and Why Does Your Body Need It?
Vitamin C is a water-soluble vitamin that humans cannot produce. The body stores only limited amounts, so regular dietary intake is needed to maintain adequate levels. You have to get it every single day through foods like oranges, amla, guavas, tomatoes and other vitamin C-rich fresh fruits and vegetables. People do worry about vitamin C and its side effects, but there is no question that the vitamin is essential for maintaining good health.
Vitamin C plays a key role in helping your body out by making collagen, which keeps the skin, bones, cartilage and blood vessels healthy. It supports wound healing, boosts iron absorption from plant-based foods and acts as an antioxidant to protect the cells from free radicals.
How Much Vitamin C Should You Take Each Day?
Since vitamin C is water-soluble, the body just uses what it needs and removes most of the excess through urine. So getting an excess of vitamin C from daily food is unlikely. However, taking high-dose vitamin C supplements can easily increase the intake above the recommended limit.
The daily requirement depends on your age, sex and life stage. The table below shows the recommended dietary allowance (RDA) for different groups:
| Group | Recommended Daily Intake (RDA) |
| Men (19 years and above) | 90 mg |
| Women (19 years and above) | 75 mg |
| Pregnant women (19–50 years) | 85 mg |
| Pregnant girls (14–18 years) | 80 mg |
| Breastfeeding women (19–50 years) | 120 mg |
| Breastfeeding girls (14–18 years) | 115 mg |
| Children | Varies by age |
For most healthy adults, a balanced diet that includes citrus fruits, guava, amla, kiwi, capsicum, tomatoes and other fresh fruits and vegetables provides all needed for the daily requirement. You can take supplements that provide around the daily needs unless your doctor advises otherwise.
The upper limit for how much an adult has in a day is 2,000 mg, but taking more than that doesn't help the body and can even increase the chance of a vitamin C overdose.
What are the Side Effects of Taking Too Much Vitamin C?
The most common vitamin C side effects occur when the daily recommended limit is exceeded. Some of these problems are:
Digestive Problems
One of the first signs of vitamin C overdose is that the person might start facing digestive discomfort. Symptoms like diarrhoea, nausea, stomach cramps and bloating can kick in if consuming more than the upper limit of 2,000 mg a day. These are usually linked to supplements rather than food. If the discomfort continues, stop taking the supplements and talk to the doctor.
Increased Risk of Kidney Stones
The effect of overdose of vitamin C is that you may be at a higher risk of getting kidney stones. When your body has too much vitamin C, it turns into oxalate, which then passes out through your urine. When that happens, the levels of oxalate become too high, and this can combine with minerals to form kidney stones. This is especially a problem if you already have kidney issues or a history of kidney stones.
Iron Overload in Some People
Vitamin C makes it easier for the body to absorb iron. That's a good thing for most people, but not for those with conditions like haemochromatosis who may end up absorbing too much of it. When that happens, you may experience vitamin C adverse effects like iron building up in the system, which can cause damage to organs like the liver, heart and pancreas over time.
Tooth Enamel Damage
Vitamin C tablet side effects may also include damage to tooth enamel when chewable tablets are used frequently. To avoid that, rinse your mouth out with water after taking chewable supplements.
Reduced Absorption of Certain Nutrients
If excessive amounts of vitamin C are taken for too long, it may also affect how the body processes some other nutrients. Excess of vitamin C can lower levels of nutrients such as vitamin B12 and copper. These nutrients are essential for normal nerve function, a healthy blood cell count and overall health.
Sleep Disturbances
Some people have trouble sleeping after taking large doses of vitamin C, especially if they take them too close to bedtime, and that is often because of stomach discomfort rather than the vitamin itself. If that happens, try to avoid taking supplements at night to avoid sleep disturbances.
Skin Reactions
While not very common, vitamin C side effects on skin may include redness, itching, rashes or swelling if you are sensitive to certain ingredients in the supplement. However, if swelling of the face, lips or throat appears, seek medical help right away.
Tips to Avoid Too Much Vitamin C
Most people get all the vitamin C they need from a balanced diet. To avoid getting an excess of vitamin C without missing out on its benefits, just follow these simple habits:
- Focus on getting your vitamin C from whole foods like amla, oranges, guavas and lemons, and from vegetables like tomatoes, bell peppers and broccoli before turning to supplements every single day.
- Just pay attention to the dosage on the supplement bottle or follow what the doctor says to take.
- Be careful not to overdo it on the vitamin C supplements, as it adds up quickly with multiple supplements.
- Check the ingredient list of your multivitamins and supplements to make sure you're not getting too much vitamin C from all different places.
- If you've got kidney disease, iron overload or any chronic health issue, be sure to check with your doctor before taking high-dose vitamin C supplements.
- Eat a healthy, balanced diet to cover your nutritional bases unless you really need a supplement for a medical reason.
Conclusion
Vitamin C is an essential nutrient that supports immunity, skin health, wound healing and iron absorption. Taking more vitamin C than the body needs just doesn't give any extra benefits; it will be the cause of stomach problems, increasing the risk of kidney stones or maybe even other health issues in some cases.
Most people get all the vitamin C they need from eating a healthy mix of fruits and vegetables. If you do choose to take supplements, just make sure you're following the recommended dosage and check with a doctor before popping high doses regularly.
Reader Information: This article is for general educational purposes only and should not replace medical advice. Consult a healthcare professional before taking high-dose vitamin C supplements, especially if you have kidney disease, iron overload disorders or other medical conditions.
