Who shouldn’t take vitamin C? Supplement vitamin C properly

21.03.23 119

Vitamin C plays an extremely important role in improving resistance and strengthening the immune system. But in fact, for certain reasons, not everyone can supplement with vitamin C. So who shouldn’t take vitamin C? Let Solife answer for you through the article below

1. The most popular forms of vitamin C supplements today


Besides vegetables, fruits and foods, supplements are an important source of vitamin C in the body. Before answering the question of who should not take vitamin C, let’s take a look at some forms of vitamin C supplements below:

  • Vitamin C capsules: The most popular form of vitamin C supplements. The biggest advantage is that it is simple to use, highly effective, convenient and easier to store than other forms.
  • Powder form: The ability to absorb when entering the body is relatively good, but it is difficult to store, very easy to mold, damaged, affecting the effectiveness brought to users.
  • Liquid, syrup: Suitable for children or the elderly because of its easy absorption. In particular, the taste of this form is delicious, much easier to drink than the tablet form.
  • Chewable tablets (marshmallows): As a supplement for young children because they have delicious fruit flavors, eye-catching colors, and help stimulate children’s taste buds.
  • Effervescent tablets: Easy to take, easy to use, the dosage of vitamin C is not too high.


In fact, capsules and effervescent tablets are the most popular and are chosen by more people. However, syrup form and marshmallow form are equally popular for the elderly and children.

2. Indications of vitamin C

Who should not take vitamin C and who needs to supplement vitamin C regularly for the body?

According to experts, the following subjects need to regularly supplement vitamin C in various forms to increase resistance and improve overall health:

  • People who often experience stress, fatigue, reduced resistance, weak body…
  • People often have bleeding gums, gingivitis or some dental diseases.
  • Pregnant women, nursing mothers or people taking oral contraceptives.
  • Athletes.
  • People who are addicted to alcohol, beer, tobacco or stimulants
  • People working in polluted and toxic environments.
  • Young children, elderly people
  • People with poor resistance, frequent minor illnesses, flu, runny nose..when the weather changes.


In particular, those with asthma, collagen disorders, heatstroke, infections, inflammation, arthritis, slow wound healing, etc. should also supplement with vitamin C daily. The recommended dosage is about 40 – 135mg/day or as directed by your doctor.

Should supplement vitamin C in the morning, after eating to promote the most effective effect. Do not take vitamin C before bedtime because it can affect the quality of sleep for each person. In particular, absolutely do not abuse vitamin C because it can lead to dangerous side effects to health.

Read more: Recommended Dose Of Vitamin C And Notes When Taking It

3. Who should limit the use of vitamin C?

Who should not take vitamin C? According to doctors, vitamin C is contraindicated in cases of blood disorders such as Thalassemia, sickle cell disease, G6PD deficiency, hemoglobin.


Vitamin C should also be used with caution or limited in the following cases:

  • People with diabetes: Vitamin C can increase blood sugar levels, causing dangerous complications.
  • Patients with oxalate kidney disease or kidney stones: Acidification by ascorbic acid may increase the likelihood of precipitation of urate, cysteine, and oxalate stones in the body.
  • People with hereditary pigmentation disorder (hemochromatosis): These subjects store a lot of iron in the body, if supplemented with vitamin C, it can cause excess, stagnation of iron, damaging tissues in the body. .
  • People who are taking drugs or supplements that interact with vitamin C: Aspirin, non-steroidal anti-inflammatory drugs (NSAIDs), Acetaminophen, aluminum-containing antacids, sedatives, chemotherapy drugs, nitrates for heart disease, Oral contraceptives, Protease inhibitors, Tetracycline, Warfarin
  • People with cardiovascular disease, or undergoing radiation therapy, cancer treatment

And when taking vitamin C, it is best to consult a doctor, especially for those who are being treated for disease or are using other drugs and supplements. Doctors will answer the question of whether you should supplement with vitamin C, with what dosage is reasonable.


And those are our answers to the question of who should not take vitamin C, along with useful advice on dosage and usage. You can also naturally supplement your own Vitamin C through Solife’s list of foods contain vitamin C. Save it now to ensure that the use of vitamin C brings the best results for yourself, your family and those around you.


Trần Hoàng Uyên (Senior Manager Pharmaceutical company) là chuyên gia cấp cao với nhiều năm kinh nghiệm trong lĩnh vực dược phẩm. Tốt nghiệp cử nhân chuyên ngành Quản lý dược I tại Trường Đại học Y dược TP. Hồ Chí Minh và hiện đang công tác tại công ty dược phẩm. Với hơn 10 năm kinh nghiệm làm việc trong ngành dược, chị Hoàng Uyên là chuyên gia cộng tác tham vấn y khoa cho danh mục blog cũng như các nội dung liên quan trên Solife. (Tran Hoang Uyen (Senior Manager Pharmaceutical company) is a senior specialist with many years of experience in the Pharmaceutical field. She graduated Bachelor of Pharmacy Management I at the University of Medicine and Pharmacy at Ho Chi Minh City and is currently working for a pharmaceutical company. With more than 10 years of experience working in the pharmaceutical industry, Ms. Hoang Uyen is a medical consultant collaborator for content on Solife's website.)