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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 support immune system — 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
Mostly mechanism / observational
Top outcomes
Verdict
Mixed evidence
1 of 3 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
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) · Systematic 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) · Systematic 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.
Based on systematic reviews and clinical studies using PSK/PSP extracts. Most studies used standardized polysaccharide extracts, not raw mushroom powder. Effects may be significantly lower with mycelium-on-grain products due to poor bioavailability.
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.
For support immune system, Turkey Tail has a higher relevance score (85 vs 38).
No known interactions between L. casei Shirota and Turkey Tail have been documented in our database. However, always consult a healthcare provider before combining supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.