Effect of Probiotic Strain Lactobacillus Paracasei PS23 on Brain Fog in People With Long COVID

The goal of this clinical trial is to test whether the intervention of probiotics supplement can improve symptoms of long covid syndrome. Participants will be given probiotics or placebo capsules for two month. Symptom questionnaires, cognitive function, eeg and fecal sample are recorded/collected before and after the supplement. Researchers will compare the probiotic group and the placebo to see if probiotic supplement really make differences.