Can a high dose of ascorbic acid cause stomach discomfort?

L-ascorbic acid is an acid in the literal sense, and when taken on an empty stomach or when the lining of the gastrointestinal tract is particularly sensitive, it can cause discomfort: heartburn, a feeling of heaviness or irritation. This is not specific to this particular product but a general property of high doses of ascorbic acid.

A few practical points that help reduce the likelihood of discomfort:

• Take it with a meal or straight after one — food buffers the acid load on the stomach lining.
• Drink enough water — it is recommended to take the capsule with a full glass of water.
• Do not combine it with coffee or acidic drinks at the same time — this makes the environment in the stomach even more acidic.

If discomfort still occurs, it is a signal to discuss with a specialist whether this particular form and dosage is right for you. There are buffered forms of vitamin C (for example, calcium ascorbate) that are gentler on the stomach — but these are different products with a different composition.

People with peptic ulcer disease, gastritis with high acidity or other gastrointestinal conditions should agree on taking high doses of ascorbic acid with their doctor in advance.