I watched the video. The woman doctor refers to her father’s 40 years experience with high Vitamin C. Do you know his name? She recommends 20 to 4 grams of C a day. I have been taking 3 to 6 grams a day for my allergies. She also mentioned the C trials in China and Dr. Cheng. Here is an article on him and his comment that NY which is trying Vitamin C is not using enough. I agree with him. I once gave a woman suffering from bee sting allergy 50 grams of C over an 8 hour period. Three yellow jackets had stung her neck and after the first 10 grams (crushed in water) her eyes opened again, her throat opened, and the body swelling began to go down. All this in 20 minutes.
https://nypost.com/2020/03/24/new-york-hospitals-treating-coronavirus-patients-with-vitamin-c/
Correcting my typo. She recommends 2 to 4 grams of C a day as maintenance dose.