[stubish]

Some vitamins, including vitamin C, cause various problems in high doses. Is the amount used as a preservative enough to count as a 'megadose' of vitamin C?

[gus_massa]

Nah. You need 2g=2000mg to overdose https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-h... It's not impossible using supplements, but food has too little.