It is normal in the sense that it definitely happens to other people (myself included) but it's not the standard experience.
Some suspect that a herx from vitamin C might not be a true herx but rather a reaction to increased acidity and/or bowel intolerance (2.5 grams of vitamin C will give a lot of people diarrhea).
Lyme, bartonella, babesia, mycoplasma, EBV
Mold, MCAS, POTS, CFS/ME, HPA axis
Herbs, AmpCoil, DNRS, diet, nutrients, EOs