Here is the link on uses of Vitamin C in high doses for many conditions including stress, surgery, and trauma. it is one of several found by entering “Dr. Robert Cathcart and Vitamin C” on the URL line.
https://visionearth.org/downloads/Cathcart-vitamin-c-titrating.pdf
It is described as Titrating to Bowel Tolerance using both oral and intravenous administration. This link is in the form of numbered printed pages in two columns. Near the end of text is important information on self protection if hospitalized and customarily use higher doses of C on a regular basis. There are 32 References, including several more articles by Dr. Cathcart.
I usually bump mine up when I get a hint of a cold or sniffles. Works foe me. Your results may differ.
Thank you. Timely information for a family member.