Ascorbic Acid (Vitamin C Injectable): Patient Information & Safety Notes
Also known as Vitamin C, L-ascorbic acid
Other names: vitamin-c, l-ascorbic-acid, injectable-vitamin-c
Ascorbic acid (vitamin C) is an essential water-soluble vitamin involved in collagen synthesis, iron absorption, and antioxidant defense. Injectable vitamin C is FDA-approved for specific deficiency states; high-dose IV use is investigational for certain oncological adjunct protocols.
In plain language
What Ascorbic Acid is used for
- FDA-approved: scurvy (vitamin C deficiency)
- Off-label/supplement: immune support, collagen synthesis, antioxidant therapy
Taking this medicine
How it is administered
- Subcutaneous injection (compounded)
- Intravenous infusion (clinical setting)
Read before you decide
Risks and precautions
Risks and warnings
- Injection site irritation
- Mild headache, fatigue
- Nausea at high doses
- Kidney stones (with very high doses — oxalate formation)
Who should not take it
- G6PD deficiency (hemolytic anemia risk with high-dose IV vitamin C)
Common questions
Patient questions
Is high-dose IV vitamin C proven to treat cancer?
High-dose IV vitamin C is being studied as an adjunct (not a replacement) in some cancer protocols. It is not FDA-approved to treat cancer. Individuals with cancer should follow their oncologist's recommendations for evidence-based treatment.
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This information is educational — not medical advice.
This page is provided for general educational purposes and summarizes publicly available data from sources such as the U.S. Food & Drug Administration. It is not a substitute for the judgment of a licensed clinician and should not be used to start, stop, or change any medication. It may be incomplete or out of date, and individual circumstances vary. Always talk with your prescriber or pharmacist about your specific medications and health conditions. If you think you may have a medical emergency, call 911.
Sources & References
Learn more about where our data comes from and how we write and review medical content.