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Head-to-head evidence comparison — which supplement is right for you?
L. casei Shirota vs Turkey Tail: Turkey Tail has the stronger overall evidence (6 vs 5/10); they're alternatives for improve digestion — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Turkey Tail wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Mostly mechanism / observational
2 of 2 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both L. casei Shirota and Turkey Tail have evidence — compare verdict strength side-by-side.
One 65-100 mL bottle of the fermented milk drink daily, delivering roughly 6.5 x 10^9 to 1 x 10^11 CFU depending on the product. Doses across trials span this whole range with no dose-comparison study to separate them.
Any time of day
Fermented milk drink containing L. casei Shirota (Yakult), 65-100 mL daily
1-3g dried mushroom or equivalent extract
With or without food
Hot water extract capsules or powder
4 weeks
2 weeks
2-12 weeks
8 weeks
4-8 weeks
4-8 weeks
Efficacy of daily intake of Lactobacillus casei Shirota on respiratory symptoms and influenza vaccination immune response: a randomized, double-blind, placebo-controlled trial in healthy elderly nursing home residents.
Am J Clin Nutr (2012) · Rct · n=737
PRIMARY ENDPOINTS ALL NULL: no effect on days with respiratory symptoms, probability of respiratory symptoms, or post-vaccination antibody titre
Probiotics and synbiotics in chronic constipation in adults: A systematic review and meta-analysis of randomized controlled trials.
Clin Nutr (2022) · Meta analysis
Probiotics overall increased stool frequency (SMD 0.71, 95% CI 0.37-1.04, p<0.00001) — but the effect was driven by Bifidobacterium lactis, 'not mixtures of probiotics, Bacillus coagulans Unique IS2 or Lactobacillus casei Shirota'
A study into the effect of Lactobacillus casei Shirota in preventing antibiotic associated diarrhoea including Clostridioides difficile infection in patients with spinal cord injuries: a multicentre randomised, double-blind, placebo-controlled trial.
EClinicalMedicine (2021) · Rct · n=359
PRIMARY ENDPOINT NULL: antibiotic-associated diarrhoea at 30 days 45% vs 42.1% (RR 1.071, 95% CI 0.8-1.4, p=0.639)
Anti-Cancer Potential of Edible/Medicinal Mushrooms in Breast Cancer
International journal of molecular sciences (2023) · Review
In this article, we reviewed mushrooms showing antineoplastic activity again breast cancer cells, especially focusing on the possible bioactive compounds involved and their mechanisms of action.
Coriolus (Trametes) versicolor mushroom to reduce adverse effects from chemotherapy or radiotherapy in people with colorectal cancer
The Cochrane database of systematic reviews (2022) · Systematic review · n=1569
We found low-certainty evidence of a small effect of adjunctive Coriolus on improved survival at five years compared with no adjunctive care (RR 1.08, 95% CI 1.01 to 1.15; 1094 participants; 3 studies; number needed to benefit (NNTB) = 16 (95% Cl 9 to 70).
Current Advancements in Antitumor Properties and Mechanisms of Medicinal Components in Edible Mushrooms
Nutrients (2022) · Review
Our review summarizes the research progress on the anticancer properties of edible and medicinal fungi and the underlying molecular mechanism, which may offer a better understanding of this field.
The only cited trial that compared doses is a phase I dose-escalation study with no control group (PMID 22701186): women who had finished radiotherapy for breast cancer took 3, 6 or 9 g a day of a Trametes versicolor preparation for 6 weeks, 3 women per dose, 9 completing. It reported trends, not significant effects: higher lymphocyte counts at 6 and 9 g, higher natural killer cell activity at 6 g, and dose-related rises in CD8+ T cells and CD19+ B cells. Nine adverse events were reported (7 mild, 1 moderate, 1 severe) and the authors judged up to 9 g a day safe and tolerable. These are blood immune markers, not infections or other clinical outcomes, and no trial shows a benefit above 6 g.
AI-estimated from published studies. Interpret as directional guidance.
Turkey Tail has a higher evidence score (6/10 vs 5/10) and wins in 2 of 3 categories.
Both L. casei Shirota and Turkey Tail score equally (52) for improve digestion.
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.