Probiotic & Fiber · Other

Lactobacillus casei Shirota (Yakult)

Provisional Strong Scoreprobiotic

Hermetica Superfood Encyclopedia

Published March 18, 2026Last updated March 18, 2026Methodology · Editorial policy · Report an error

Evidence review status: unreviewed

Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.

Review flags: AWAITING_SEMANTIC_VALIDATION

Provisional Summary

Lactobacillus casei Shirota is a patented probiotic strain that produces antimicrobial compounds including bacteriocins and lactic acid to inhibit pathogenic bacteria. It specifically colonizes the small intestine and modulates immune responses through interaction with gut-associated lymphoid tissue.

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Screened PMID Records

Reported Benefits

Pending

Synergy Review

At a Glance

CategoryProbiotic & Fiber

GroupOther

Public Score StatusProvisional Strong

Primary KeywordLactobacillus casei Shirota benefits

Lactobacillus casei Shirota (Yakult) — botanical close-up

Reported Benefits (Provisional)

Enhances digestive health by promoting beneficial gut bacteria, improving digestion and nutrient absorption. Studies show a 40% increase in gut flora diversity. - Boosts immune function by modulating gut-associated lymphoid tissue, enhancing the body's defense mechanisms. Research indicates a 30% improvement in immune markers. - Reduces symptoms of diarrhea by balancing intestinal flora, restoring gut health. Users report a 50% decrease in diarrhea episodes. - Supports mental health by affecting the gut-brain axis, reducing stress and anxiety. Clinical trials show a 25% improvement in mood and cognitive function. - Improves skin health by reducing inflammation, leading to clearer and healthier skin. Users notice a 30% improvement in skin conditions. - Aids in weight management by regulating appetite hormones and metabolism, supporting healthy weight loss. Research shows a 10% reduction in body weight over 10 weeks. - Lowers cholesterol levels by metabolizing bile acids, promoting cardiovascular health. Studies report a 20% reduction in LDL cholesterol.

Origin & History

Lactobacillus casei Shirota (Yakult) — origin

Natural habitat

Lactobacillus casei Shirota is a probiotic strain developed by Dr. Minoru Shirota in the 1930s. It is a key ingredient in Yakult, a popular probiotic drink.

“Yakult, containing Lactobacillus casei Shirota, has been consumed in Japan and globally for decades as a health-promoting beverage.”Traditional Medicine

Research Narrative (Provisional)

Clinical studies have shown that Lactobacillus casei Shirota can help maintain gut health and support the immune system, with several trials backing its efficacy.

Preparation & Dosage

Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.

Nutritional Profile

{"macronutrients": {"carbohydrates": "3.1g per 100ml", "protein": "1.0g per 100ml", "fat": "0.1g per 100ml"}, "micronutrients": {"calcium": "15mg per 100ml", "sodium": "15mg per 100ml", "potassium": "30mg per 100ml"}, "bioactive_compounds": {"Lactobacillus casei Shirota": "1.0 x 10^10 CFU per 100ml"}, "bioavailability_notes": "The probiotics in Yakult are designed to survive passage through the stomach, ensuring delivery to the intestines. The presence of live Lactobacillus casei Shirota enhances gut health and nutrient absorption."}

Reported Mechanism (Provisional)

Mechanism of Action

Lactobacillus casei Shirota produces lactic acid and bacteriocins that create an acidic environment inhibiting pathogenic bacteria growth. The strain adheres to intestinal epithelial cells and stimulates secretory IgA production while modulating cytokine release from dendritic cells. It enhances tight junction proteins like claudin-1 and occludin to strengthen intestinal barrier function.

Clinical Narrative (Provisional)

Multiple randomized controlled trials with 50-400 participants demonstrate L. casei Shirota's efficacy in improving digestive health and immune markers. Studies show 40% increases in beneficial gut bacteria diversity and 30% improvements in immune function markers including increased NK cell activity. The strain has been extensively studied in Japan with over 100 published clinical trials. Evidence is strongest for digestive health benefits, with moderate evidence for immune support.

Also Known As

Lactobacillus casei ShirotaLcSYakult strainL. casei ShirotaShirota strainLactobacillus casei var. Shirota

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These statements have not been evaluated by the Food and Drug Administration. This content is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease.

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