High-dose (15+ grams) intravenous (IV) Vitamin C is often considered as a complementary therapy for cancer and autoimmunity because it acts as a pro-oxidant cytotoxic agent against cancer cells, acts as an immune modulator that lowers chronic inflammation, and improves quality of life by reducing side effects from standard treatments. 

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Here are three key reasons to consider this therapy:

1. Selective Cytotoxicity Against Cancer Cells
   At high concentrations (achieved only via IV), vitamin C generates reactive oxygen species (ROS) that can selectively induce cell death in cancer cells without harming healthy cells. This process is particularly notable in its ability to target cancer-specific metabolism, inhibiting tumor growth and metastasis, especially in pancreatic, liver, and ovarian cancers.

2. Reduction of Inflammation and Immune Modulation
   In autoimmune conditions and cancer, high-dose IV Vitamin C aids in reducing high levels of oxidative stress and systemic inflammation. It acts as an immune modulator by regulating epigenetic mechanisms (TET enzymes) and boosting the function of immune cells like Natural Killer (NK) cells, helping to restore immune homeostasis.

3. Improved Quality of Life and Reduced Treatment Side Effects
   For cancer patients undergoing chemotherapy or radiation, high-dose IVC has been shown to alleviate debilitating side effects, including severe fatigue, insomnia, nausea, vomiting, and loss of appetite. Patients frequently report higher energy levels and better physical and emotional functioning