Vitamin C is a low-risk supplementwith an RDA of 90 mg and a safe upper limit (UL) of 2000 mg per day according to FDA standards. CNS lists a RDA of 100 mg with the same UL; MHLW lists a RDA of 100 mg with the same UL. It has 3 known interactions with other supplements including collagen, iron, quercetin. Use NutriAudit to check if your supplement stack keeps this ingredient within safe limits.
Vitamin C sits in the Water-Soluble Vitamins category. This page consolidates 5 regional standards, and the limits vary enough that you should not treat one region's rule as universal.
It also has 3 known interactions, so the question is not just the label dose but whether the rest of your stack adds extra risk.
| Region | Organization | RDA | Upper Limit (UL) | Unit |
|---|---|---|---|---|
| πΊπΈ United States | FDA | 90 | 2000 | mg |
| πͺπΊ Europe | EFSA | 90 | 2000 | mg |
| π¦πΊ Australia | TGA | 90 | 2000 | mg |
| π¨π³ China | CNS | 100 | 2000 | mg |
| π―π΅ Japan | MHLW | 100 | 2000 | mg |
RDA = Recommended Daily Allowance (adequate intake for most adults). UL = Tolerable Upper Intake Level (maximum safe daily amount).
Vitamin C enhances collagen synthesis (positive interaction).
Taking vitamin C with collagen is beneficial.
Vitamin C enhances iron absorption (positive interaction).
Taking together is beneficial.
Vitamin C enhances quercetin absorption (positive interaction).
Taking quercetin with vitamin C is beneficial.
First match your product label against the dose table above, then check whether the known interaction list includes anything in your current stack.
If you are taking multiple supplements, the safest approach is usually to audit the whole stack instead of judging a single bottle in isolation.
The safe upper limit (UL) for Vitamin C is 2000mg per day according to FDA. Exceeding this amount regularly may increase the risk of adverse effects.
The RDA for Vitamin C is 90mg per day for most adults. This amount is sufficient to meet the needs of 97-98% of healthy individuals.
Yes, Vitamin C has 3 known interactions with other supplements. Vitamin C enhances collagen synthesis (positive interaction).
Check if your supplement stack keeps Vitamin C within safe limits.
Audit My SupplementsDisclaimer: NutriAudit is a decision-support tool designed to help you review your supplement stack for potential duplicate, conflicting, or excessive ingredients. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making changes to your supplement routine, especially if you are pregnant, nursing, taking medications, or have a medical condition.
Based on reference standards from FDA, EFSA, TGA, and MHLW.