She recommends sodium ascorbate. The Vitamin C doesn’t do anything to the pertussis bacteria. It helps clear out the toxins that the bacteria create.
Sodium ascorbate has the same function as ascorbic acid, the only difference is that it is the sodium salt of ascorbic acid. It has an E number (E301) in the ascorbic acid range E300 to E305.
Please explan how it can “clear out the toxins that the bacteria create”.