Vitamin

Vitamin C

Vitamin studied for collagen synthesis, antioxidant support, immune function. How it works, the dose and timing studied, what it interacts with, and the research behind the grade.

Grade A evidence strong: trials and meta-analyses agree Also known as Ascorbic acid
All compounds
Best for Collagen synthesis, Antioxidant support, Immune function, Iron absorption
Typical dose 75–120 mg daily (RDA); commonly supplemented at 250–1,000 mg
Timing Any time; split doses absorb better than one large dose
Category Vitamin
How it works

What it is and the mechanism

Water-soluble vitamin and essential cofactor for enzymes that build collagen, synthesize carnitine and neurotransmitters, and regenerate other antioxidants. It also reduces dietary iron to its absorbable form in the gut.

Dose and timing

When and how much to take

The dose below reflects the range used in published research. Match the form alongside the milligrams. Set your own wake and bed times to map the timing onto your day.

Timing visualizer

When to take Vitamin C

Dose: 75–120 mg daily (RDA); commonly supplemented at 250–1,000 mg. Set your own wake and bed times to map the guidance onto your day.

12a6a12p6pDAY2 doses
7 amMorning dose. Take the first portion after waking.
9 pmEvening dose. Take the second portion in the evening.

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.

Before you stack it

Interactions and cautions

Read these before combining this with other supplements or medication. The risk is rarely the headline, it is the interaction you did not check.

Interactions
  • Iron, enhances non-heme iron absorption (often intentional)
Cautions
  • Doses above 2,000 mg/day can cause diarrhea
  • History of kidney stones, high doses may raise oxalate
Stacking

What pairs well, and what to keep apart

Derived from shared topics, complementary categories, and the interaction list. Introduce one compound at a time so you can tell what works.

Explore more

Compounds in the same topics

Often considered alongside this one. Each carries its own evidence grade.