The Anticancer Actions of IV Vitamin C: Mechanisms, Dosing, Safety Labs, and Integration with Oncology Care

Researched and written by Keith Bishop, Clinical Nutritionist, Cancer Coach, and Founder of Prevail Over Cancer™, and the Prevail Protocol™

High-dose intravenous vitamin C (IVC) has reemerged as a promising adjunctive therapy in integrative oncology. Modern research highlights its unique pharmacology, potential anticancer mechanisms, and its ability to support patients undergoing chemotherapy, radiation, and immunotherapy. This guide breaks down the science, dosing considerations, safety labs, and clinical integration—supported by peer-reviewed medical literature.

What Makes IV Vitamin C Different From Oral Vitamin C?

Oral vitamin C absorption is tightly limited by intestinal transporters, which cap blood levels even at high doses. In contrast, IV administration bypasses intestinal absorption and produces blood concentrations 100–500× higher than those required for a...

Foods, supplements, and lifestyle habits that support your immune system’s interferon natural defense.

Researched and written by Keith Bishop, Integrative Cancer Educator, Clinical Nutritionist, Cancer Coach, Retired Pharmacist, and Founder of Prevail Over Cancer.

What Is Interferon?

Interferons are natural proteins your body makes to help fight infections and abnormal cells—including cancer. They act like messengers, telling your immune system to wake up, attack, and clean up. There are three main types:

• Type I (IFN-α and IFN-β): These help stop cancer cells from growing and spreading.
• Type II (IFN-γ): This type activates immune cells to recognize and destroy cancer cells.
• Type III (IFN-λ): Mostly helps protect surfaces like your skin and gut, with growing interest in cancer research.

Interferons are so powerful that some cancer treatments use them directly or try to boost their effects.[i]

Foods That May Help Your Body Make More Interferon

Eating certain foods can suppor...