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Head-to-head evidence comparison — which supplement is right for you?
Olive Leaf Extract wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
9 of 11 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
3 of 5 studies with measurable effects showed benefit.
Top outcomes
500-1000mg (standardized to 15-20% oleuropein)
With meals
Standardized extract (15-20% oleuropein)
5-15g dried mushroom or 1-3g extract daily
With meals, Divided doses if using higher amounts
Shiitake extract (standardized to polysaccharides)
2-4 weeks
8 weeks
4 weeks
8-12 weeks
4-8 weeks
The impact of oleuropein, hydroxytyrosol, and tyrosol on cardiometabolic risk factors: a meta-analysis of randomized controlled trials
Critical reviews in food science and nutrition (2025) · Meta analysis · n=594
Fourteen human intervention studies with 594 participants were included.
Exploring the Benefits of Extra Virgin Olive Oil on Cardiovascular Health Enhancement and Disease Prevention: A Systematic Review
Nutrients (2025) · Systematic review
The beneficial effect was attributed to the polyphenols contained in EVOO.
Olive leaf extract effect on cardiometabolic risk factors: a systematic review and meta-analysis of randomized clinical trials
Nutrition reviews (2024) · Meta analysis · n=703
In the meta-analysis, fasting glycemia, as evaluated in studies using a low dose of OLE, showed a significant result favoring the control group.
Critical Review on the Anti-Tumor Activity of Bioactive Compounds from Edible and Medicinal Mushrooms over the Last Five Years
Nutrients (2025) · Systematic review
In recent years, the incidence rate of cancer has been on the rise all over the world, and the age of cancer patients has shown a younger trend, which seriously endangers patients' health.
Vitamin B12 sources in non-animal foods: a systematic review
Critical reviews in food science and nutrition (2023) · Systematic review · n=25
In the last decade, more sensitive method for real B12 determination was used, the liquid chromatography-electrospray ionization tandem mass spectrometry chromatograms.
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.
Based on RCT showing 6.4 mmHg SBP reduction, but one crossover trial showed no effect. Mixed results suggest conservative effectiveness estimates. Primarily studied in hypertensive populations.
Based on beta-glucan studies and one pilot RCT (n=239) showing modest immune response trends. Evidence limited by small sample sizes and primarily preclinical data. Effects may vary significantly by extract standardization and processing method.
AI-estimated from published studies. Interpret as directional guidance.
Olive Leaf Extract has a higher evidence score (7/10 vs 4.5/10) and wins in 2 of 3 categories.
Both Olive Leaf Extract and Shiitake score equally (75) for support immune system.
No known interactions between Olive Leaf Extract and Shiitake have been documented in our database. However, always consult a healthcare provider before combining supplements.