ascorbic acid at a glance
Medicine class
Water-soluble vitamin and reducing agent
Licensed role
Prevention and treatment of vitamin C deficiency, including scurvy
Available routes
Oral tablets and clinician-administered intravenous preparations
Important precaution
Tell clinicians before blood, urine or stool tests because ascorbic acid can alter some results
What is ascorbic acid used for?
Licensed uses include:
Treating vitamin C deficiency, including scurvy.
Preventing scurvy where supplementation is required.
Parenteral replacement when deficiency is acute or oral or dietary replacement is unsuitable or difficult.
How does ascorbic acid work?
Ascorbic acid acts as an enzyme cofactor and reducing agent. It supports collagen production, tissue repair, carnitine and neurotransmitter synthesis, folate metabolism and absorption of non-haem iron. Deficiency disrupts connective tissue and causes scurvy.
ascorbic acid preparations and strengths
Tablet
Route: Oral
Strengths: 500 mg
Injection
Route: Parenteral
Strengths: 150 mg/mL, 500 mg/5 mL
How to take ascorbic acid
Use tablets exactly as directed on the label or by a clinician. A tablet may be broken to make swallowing easier, but its score line does not produce equal portions. Injectable products must be prepared and administered by healthcare professionals; the concentrated infusion requires dilution and is for single use.
Do not use injectable ascorbic acid yourself unless specifically trained and instructed.
Tell the treating team about kidney disease, kidney stones, iron-overload disorders, G6PD deficiency and planned laboratory tests.
ascorbic acid side effects
Common or expected effects
- No common adverse effects are established in the selected product information. Diarrhoea, nausea, vomiting or increased urination may occur with large amounts.
Get urgent medical advice
- Allergic or hypersensitivity reactions, including breathing difficulty, hives or widespread rash.
- Haemolytic anaemia in susceptible people with G6PD deficiency.
- Hyperoxaluria, calcium oxalate stones or renal injury, particularly with large amounts or underlying renal risk.
ascorbic acid in pregnancy
Vitamin C is needed during pregnancy and is usually obtained from a varied diet. Product information advises caution with medicinal supplementation; the concentrated infusion is unsuitable during pregnancy. Ask a pharmacist, midwife or prescriber before use.
ascorbic acid while breastfeeding
Ascorbic acid passes into breast milk, but the selected tablet and standard injection information identifies no evidence of harm. The concentrated infusion is unsuitable while breastfeeding. Discuss medicinal supplements with a pharmacist or prescriber, especially if the baby was premature or had neonatal jaundice.
ascorbic acid interactions
Interactions and test effects depend on the formulation and amount used.
Desferrioxamine
Ascorbic acid can enhance iron mobilisation and increase cardiac toxicity risk; cardiac assessment and specialist supervision are required.
Aluminium-containing antacids
The combination may increase aluminium exposure and should be avoided particularly in renal impairment.
Common questions about ascorbic acid
Answers are fully visible for fast scanning and source review.
Is ascorbic acid the same as vitamin C?
Yes. Ascorbic acid is the active chemical form of vitamin C used in these products.
What is it used to treat?
It replaces vitamin C in deficiency and is licensed to prevent or treat scurvy.
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.