Question 1

How long does the gut microbiome take to recover after antibiotics?

Accepted Answer

In a landmark study, 12 healthy men received a 4-day course of three broad-spectrum antibiotics and their gut microbiota recovered to near-baseline composition within about 1.5 months. However, 9 bacterial species present before treatment remained undetectable in most subjects after 6 months. Recovery varies widely between individuals, and repeated antibiotic courses significantly extend recovery time.

Question 2

Can probiotics be taken during a course of antibiotics?

Accepted Answer

Saccharomyces boulardii CNCM I-745 is the one probiotic in this protocol with strong evidence for co-administration with antibiotics. Because it is a yeast, it is naturally resistant to antibacterial antibiotics. The protocol suggests taking it at least 2 hours apart from the antibiotic dose. Bacterial strains such as LGG and B. longum BB536 are generally added once the course has finished.

Question 3

Why does this protocol taper probiotics off after 8 weeks?

Accepted Answer

A 2018 Cell study by Suez and colleagues found that continuous probiotic supplementation actually delayed native mucosal microbiome reconstitution compared with spontaneous recovery. For that reason the protocol treats probiotics as a time-limited bridge rather than a destination, and shifts emphasis after week 8 to prebiotic fiber that feeds your own returning bacteria.

Question 4

Why should prebiotic fiber be started at such a low dose?

Accepted Answer

A post-antibiotic gut has reduced fermentation capacity because fewer microbes remain to ferment fiber. Introducing too much prebiotic fiber too quickly causes gas, bloating, and discomfort. The protocol starts PHGG at 2-3g per day in week 1 and increases by 1-2g per week as tolerated, working toward 5-10g per day.

Question 5

Which supplements are used for intestinal barrier repair?

Accepted Answer

The protocol lists sodium butyrate at 300-600 mg/day, L-glutamine at 5-10g/day, zinc carnosine at 37.5 mg twice daily, vitamin D3 at 1,000-2,000 IU/day, and combined EPA/DHA at 1-2g daily. Each is paired with published evidence and a stated mechanism, from colonocyte fuel to tight junction protein synthesis.

Question 6

When should someone see a doctor rather than self-managing recovery?

Accepted Answer

Contact a healthcare provider promptly for persistent diarrhea lasting more than 3 days, bloody stools, severe abdominal pain, or fever after completing antibiotics, as these may indicate C. difficile infection, which requires specific medical treatment. S. boulardii should also be avoided in immunocompromised individuals, those with central venous catheters, and critically ill patients due to rare fungemia risk.

Gut Restoration Protocol: Microbiome Repair After Antibiotics