Supporting Your Immune Response

The probiotic strain AB21 is the first clinically validated for the treatment of Covid-19.

A study including 300 non-hospitalized adult participants with PCR-confirmed COVID-19 and mild symptoms:

  • Remission rate, as measured by both the absence of COVID-19 symptoms and a negative RT-PCR test.

  • Reduction in the number of symptomatic patients with COVID-19.

  • Reduction in the duration of specific symptoms.

  • Reduced viral load in nasopharyngeal swabs.

  • Increased specific IgG and IgM levels against SARS-CoV-2.

The study is currently awaiting peer review.

Research Summary

The Gut-Lung Axis

Our lungs have their own microbiota, and these microbes can communicate with the microbes in our gut. This is known as the gut-lung axis. This communication is mediated in part by microbial metabolites such as short chain fatty acids (SCFAs), tryptophan metabolites, toll-like receptor (TLR) or nucleotide-binding oligomerization domain (NOD) ligands.

Research has suggested that this gut-lung axis may affect how respiratory illnesses and diseases progress and may influence how severally you suffer. Additionally, probiotics may have a role in the prevention or reduction of duration in respiratory tract infections (RTIs). Evidence has suggested that administration of certain bifidobacteria or lactobacilli has shown to be beneficial on respiratory virus clearance from the respiratory tract.

A paper published this year by Yun Kit Yeoh et al., showed that there was a link between gut microbiota composition and disease severity and dysfunctional immune response in patients with COVID-19. It was demonstrated that patients who suffered more severely from COVID-19 were depleted in gut bacteria with known immunomodulatory potential, such as Faecalibacterium prausnitzii, Eubacterium rectale and several bifidobacterial species.

The paper then suggested increasing these beneficial gut species depleted in COVID-19 could serve as a novel avenue to mitigate severe disease.


Research FAQs


Product Overview

AB21 formula is designed with the aim to bring a good anti-inflammatory
activity, improve immune response (anti-viral effect and stimulation of Ig’s
production) and to enhance intestinal barrier.


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  • 2 billion friendly bacteria

  • 4 live strains

  • Lactobacillus plantarum KABP™ 033

  • Lactobacillus plantarum KABP™ 022

  • Lactobacillus plantarum KABP™ 023

  • Pediococcus acidilactici KABP™ 021

  • Added vitamin D


Product FAQs


Probio7 Professionals

Click here for more information about AB21 as well as up-to-date research in the field of probiotics.