SupplementDuel

Vitamin C

Vitamin

Essential antioxidant and collagen cofactor. Doesn't prevent colds but shortens duration; chronically high doses may blunt training adaptations.

immuneantioxidantcollagen-synthesisiron-absorption
Typical dose
500–2000 mg daily
Evidence
Strong (multiple RCTs / meta-analyses)
Onset time
Acute and cumulative
Half-life
~30 min (plasma)
Forms
Capsule, Tablet, Powder, Liquid, Gummy
Source
synthetic
Best taken with
split doses, with food
Best time of day
any
Bioavailability
4/5
Safety rating
4/5
Price per serving
$0.06
Vegan / GF / 3rd-party
✓ / ✓ / ✓
Find Vitamin CiHerb →

Vetted brands, third-party testing, ships worldwide.

Common uses

  • • Immune support
  • • Collagen synthesis
  • • Antioxidant
  • • Iron absorption

Effect profile

Strength
●●○○○
Muscle
●●○○○
Energy
●●○○○
Focus
●○○○○
Mood
●●○○○
Sleep
●○○○○
Immunity
●●●●○
Recovery
●●●○○
Longevity
●●●○○

Common side effects

  • • GI upset (high doses)
  • • Diarrhea (>2000 mg)
  • • Kidney stones (predisposed)

Avoid if

  • • Hemochromatosis
  • • G6PD deficiency
  • • Kidney stones

Drug interactions

  • • Iron (boosts absorption)
  • • Chemotherapy

Related vitamin supplements

Vitamin C vs Vitamin D3Vitamin C vs Vitamin K2 (MK-7)Vitamin C vs Vitamin E (Mixed Tocopherols)Vitamin C vs Vitamin B12 (Methylcobalamin)Vitamin C vs Methylfolate (5-MTHF)Vitamin C vs Biotin (B7)

Medical disclaimer

SupplementDuel is for educational purposes only and is not medical advice. Consult a physician before starting, stopping, or combining supplements.