Lactobacillus Johnsonii: Comprehensive Guide to Uses, Side Effects, Precautions, and Dosing

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Lactobacillus Johnsonii: A Comprehensive Guide to Uses, Side Effects, Precautions, and Dosing


Lactobacillus johnsonii is a probiotic bacteria strain that belongs to the Lactobacillus genus. It is commonly found in the human gastrointestinal (GI) tract and plays a vital role in maintaining a healthy digestive system. Lactobacillus johnsonii has been shown to have numerous health benefits, including improving digestion, boosting the immune system, and reducing certain health risks.

Uses of Lactobacillus Johnsonii

Lactobacillus johnsonii is primarily used for the following purposes:

  • Improving Digestion: Lactobacillus johnsonii produces enzymes that help break down complex carbohydrates, making them easier to digest. It also helps regulate bowel movements and reduces symptoms such as bloating, gas, and constipation.
  • Boosting the Immune System: Lactobacillus johnsonii stimulates the immune system by increasing the production of antibodies and immune cells. This helps protect the body against infections and illnesses.
  • Reducing Health Risks: Studies have shown that Lactobacillus johnsonii can help reduce the risk of certain health conditions, such as:
    • Inflammatory Bowel Disease (IBD): Lactobacillus johnsonii has been found to improve symptoms of IBD, including Crohn’s disease and ulcerative colitis.
    • Irritable Bowel Syndrome (IBS): Lactobacillus johnsonii can help alleviate symptoms of IBS, such as abdominal pain, diarrhea, and constipation.
    • Allergies and Asthma: Lactobacillus johnsonii may help reduce the severity and frequency of allergies and asthma by modulating the immune system.

Side Effects of Lactobacillus Johnsonii

Lactobacillus johnsonii is generally safe for consumption, but some people may experience mild side effects, such as:

  • Gas and bloating
  • Diarrhea
  • Indigestion

These side effects are usually temporary and subside within a few days.


Lactobacillus johnsonii is not recommended for people with:

  • Weakened immune systems: Individuals with compromised immune systems may be more susceptible to infections from probiotics.
  • Open wounds or recent surgery: Probiotics can potentially introduce bacteria into the bloodstream, which can lead to infections.
  • Allergies to probiotics: Some individuals may be allergic to certain types of probiotics, including Lactobacillus johnsonii.


The recommended dosage of Lactobacillus johnsonii varies depending on the purpose of use. For general digestive health, a daily dose of 10 billion to 100 billion CFUs (colony-forming units) is typically recommended. For specific health conditions, such as IBD or IBS, higher doses may be necessary.

Choosing a Lactobacillus Johnsonii Supplement

When choosing a Lactobacillus johnsonii supplement, it is important to consider the following factors:

  • Strain: Ensure that the supplement contains Lactobacillus johnsonii strain specifically.
  • CFU count: Choose a supplement that provides an adequate CFU count to achieve the desired benefits.
  • Quality: Look for supplements that are manufactured by reputable companies and meet Good Manufacturing Practices (GMP) standards.
  • Shelf stability: Probiotics can lose potency over time, so choose supplements that are packaged to maintain their stability.

Alternative Sources of Lactobacillus Johnsonii

Lactobacillus johnsonii can also be obtained from fermented foods, such as:

  • Yogurt
  • Sauerkraut
  • Kimchi
  • Kombucha

However, it is important to note that the CFU count in fermented foods can vary, and may not be as concentrated as in supplements.


Lactobacillus johnsonii is a beneficial probiotic bacteria strain that offers numerous health benefits. It can improve digestion, boost the immune system, and reduce certain health risks. While generally safe for consumption, it is important to consult with a healthcare professional before taking Lactobacillus johnsonii supplements, especially if you have certain medical conditions or allergies. By choosing high-quality supplements and following recommended dosages, you can harness the health-promoting properties of Lactobacillus johnsonii.

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