ascorbic acid vs magnesium oxide
PlainMeds reviewed this comparison against our methodology in August 2026. It places FDA and CMS record fields side by side, without recommending either medication.
Side-by-side comparison of ascorbic acid and magnesium oxide. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Vitamin C
Mag-Ox
This medicine is a Vitamin C supplement. It also has Vitamins A and D. It can help prevent tooth decay.
Magnesium oxide (Mag-Ox) is a mineral supplement. It helps relieve acid indigestion and upset stomach.
This medicine gives you extra Vitamins A, C, and D. It helps make sure you get enough of these vitamins in your diet. It also contains fluoride, which helps prevent cavities. This medicine is for children up to age 16 who don't get enough fluoride in their drinking water.
Mag-Ox treats acid indigestion and upset stomach. It works by reducing the amount of acid in your stomach. Talk to your doctor if your symptoms do not improve.
Vitamin C is needed for growth and repair of tissues in all parts of your body. Vitamins A and D are also important for overall health. Fluoride helps to strengthen tooth enamel and prevent tooth decay.
Mag-Ox contains magnesium oxide, which neutralizes stomach acid. This helps to reduce discomfort caused by excess acid. It provides relief from indigestion and upset stomach.
No common side effects listed.
- • Diarrhea
- Fatigue 2,275
- Pain 2,059
- Nausea 1,943
- Diarrhoea 1,785
- Headache 1,763
- Nausea 2,795
- Diarrhoea 2,580
- Fatigue 2,419
- Dyspnoea 2,054
- Pneumonia 2,029
There are no serious warnings listed.
No specific warnings noted.
This information is for children. Ask a doctor for advice if you are pregnant or breastfeeding.
Talk to your doctor before taking Mag-Ox if you are pregnant or breastfeeding. They can help you weigh the risks and benefits.
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How to Read This ascorbic acid vs magnesium oxide Comparison
ascorbic acid is classified in the Vitamin C Supplement drug class, while magnesium oxide sits within the Mineral Supplement class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are available over the counter.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, ascorbic acid has 9,825 submissions while magnesium oxide has 11,877. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for ascorbic acid or magnesium oxide.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.