Vitamin C
Also known as: ascorbic acid, ascorbate, ester-c
Effective Dosage
75-90mg daily (RDA), up to 500-1000mg
✓ What the Science Says
Essential vitamin. Antioxidant. May slightly reduce cold duration if taken before symptoms.
✗ What It Doesn't Do
Mega-doses don't prevent colds. Excess is excreted. Not a cure for anything.
Evidence-Based Benefits
Essential vitamin. Antioxidant. May slightly reduce cold duration if taken before symptoms.
Strong EvidenceEffective at: 75-90mg daily (RDA), up to 500-1000mg
Source: NIH ODS
Absorption & Bioavailability
Good up to ~200mg, decreases with higher doses
Red Flags to Watch For
- 🚩 Mega-dose claims (>2000mg)
- 🚩 Claims to cure or prevent illness
Products Containing Vitamin C
See how Vitamin C is used in these analyzed products:
Research Sources
- NIH ODS
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-02-04