Dr. Berg’s Healthy Keto and Intermittent Fasting Podcast

The Truth About Vitamin C (It’s Not What You Think)

9 snips
Feb 13, 2026
They reframe vitamin C as a stress survival molecule used during infection, inflammation, injury, and low oxygen. They explain why humans rely on dietary sources and how sugar blocks cellular vitamin C uptake. They cover synthetic supplement concerns, signs of modern deficiency like slow healing and fatigue, and top food sources such as bell peppers, papaya, and fermented vegetables.
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INSIGHT

Vitamin C As A Stress Survival Molecule

  • Vitamin C is framed as a stress survival molecule rather than a routine maintenance vitamin.
  • Dr. Eric Berg says the body uses vitamin C like a fire extinguisher during infection, inflammation, injury, and low oxygen.
ANECDOTE

Personal Test Revealed Hidden Deficiency

  • Dr. Eric Berg reports he tested very deficient despite eating vitamin C–rich foods like sauerkraut.
  • He attributes the deficiency to overtraining and extra physical stress that consumed his vitamin C stores.
INSIGHT

Most Supplement Vitamin C Is Synthetic Ascorbic Acid

  • About 90% of supplement vitamin C is synthetic ascorbic acid made from corn sugar in factories.
  • Dr. Eric Berg warns natural vitamin C is a complex with many parts, not just isolated ascorbic acid.
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