Expert Answer

Does vitamin C actually boost immunity?

Vitamin C immune-support vitamin-c efficacy
Based on expert consensus data from publicly available videos, not medical advice. Always consult your healthcare provider before starting, stopping, or changing any supplement.

Quick Answer

Experts are mixed. Patrick has a dedicated deep-dive supporting it for immune and cardiovascular health. Hyman recommends it broadly. But Huberman notes limited cold effectiveness, and Attia argues mega-dosing offers no benefit beyond correcting deficiency.

3.1/5

Moderate Consensus

on Vitamin C overall

What Researchers Say

Peter Attia
Peter Attia Disagrees

Most skeptical - mega-dosing offers no benefit beyond correcting deficiency. Oral absorption is severely limited.

Rhonda Patrick
Rhonda Patrick Agrees

Dedicated deep-dive covering oral vs IV forms. Recommends for immune and cardiovascular health.

Mark Hyman
Mark Hyman Strongly Agrees

Recommends broadly for immune support, stress, and detoxification across dozens of videos.

Bryan Johnson
Bryan Johnson Agrees

Includes in daily protocol alongside iron.

Detailed Answer

Vitamin C immunity benefits are real but overhyped. Patrick has a dedicated deep-dive supporting its immune and cardiovascular roles. Hyman recommends it broadly. Johnson takes it daily.

But Attia is the most skeptical, arguing that mega-dosing offers no benefit beyond correcting deficiency due to severely limited oral absorption. Huberman notes limited effectiveness for cold prevention.

The consensus: adequate vitamin C intake matters (eat fruits and vegetables), but mega-dosing 1000mg+ pills is unlikely to provide additional immune benefit for most people.

Related Questions

How much vitamin C should I take?

200-500mg from food and supplements covers most needs. Attia warns oral absorption plateaus around 200mg per dose.

More Questions About Vitamin C

Do probiotics actually work? Does ashwagandha actually work for stress and a...

Precis Pro

Get the exact protocol for Vitamin C

The answer above is the whole answer — every expert's position, where they disagree, and the timecode behind each one. Nothing on this page is held back.

Pro adds

  • The dose each expert actually names, and the form they name with it
  • Timing and what they say to take it with, or keep it away from
  • The interactions they flag by name
  • Chat across 3,500+ expert videos, with a timecode behind every answer

$9/mo · Cancel anytime

Full Vitamin C Consensus Report

See what all the experts agree and disagree on
All expert answers