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Head-to-head evidence comparison — which supplement is right for you?
Vitamin D3 wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Probably helps
18 of 30 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Agarikon and Vitamin D3 have evidence — compare verdict strength side-by-side.
500-1500mg extract daily
With or without food
Agarikon extract
2000-4000 IU daily
Morning with breakfast
D3 (cholecalciferol) softgel or liquid
4-8 weeks
Ongoing
N/A
4-8 weeks
4-8 weeks
2-4 weeks
4-8 weeks
Fomitopsis officinalis: a Species of Arboreal Mushroom with Promising Biological and Medicinal Properties
Chemistry & biodiversity (2020) · Systematic review
Because of its valuable biological properties and its use in 18th and 19th-century pharmacy, Fomitopsis officinalis used to be mass-collected.
An antitumor fungal polysaccharide from Fomitopsis officinalis by activating immunity and inhibiting angiogenesis
International journal of biological macromolecules (2024) · Observational
The following mechanism examination discovered that FOBP50-1 interacted with TLR-4, PD-1, and VEGF to activate immunity and inhibit angiogenesis according to a series of cell, transgenic zebrafish, and surface plasmon resonance (SPR) experiments.
A fungal polysaccharide from Fomitopsis officinalis as a multi-target molecule to combat cancer
International journal of biological macromolecules (2024) · Observational
The following mechanistic analysis discovered that the in vivo antitumor effect was linked to immune activation and angiogenesis inhibition.
Vitamin D supplementation vs. placebo and incident type 2 diabetes in an ancillary study of the randomized Vitamin D and Omega-3 Trial
Nature communications (2025) · Meta analysis · n=5205
Mean body mass index (BMI) was 27.5 kg/m2 (SD = 5.3), with 51% female and 17% Black race/ethnicity.
Vitamin D Supplementation for Patients with Dysmenorrhoea: A Meta-Analysis with Trial Sequential Analysis of Randomised Controlled Trials
Nutrients (2024) · Meta analysis · n=687
TSA revealed that the current RCTs provide sufficient information.
Vitamin D and respiratory tract infections
BMJ (2017) · Meta analysis · n=11321
12% reduction in respiratory infections overall
Evidence primarily from animal studies and in-vitro research. Polysaccharide compounds show immunomodulatory activity through TLR-4 interactions. Human clinical data limited. Conservative estimates due to lack of RCT data.
Meta-analysis showed 12% overall reduction in respiratory infections, with greater benefits in severely deficient individuals. Daily dosing more effective than bolus. Conservative estimate assumes most users not severely deficient.
AI-estimated from published studies. Interpret as directional guidance.
Vitamin D3 has a higher evidence score (7.5/10 vs 3.5/10) and wins in 3 of 3 categories.
For support immune system, Vitamin D3 has a higher relevance score (92 vs 70).
No known interactions between Agarikon and Vitamin D3 have been documented in our database. However, always consult a healthcare provider before combining supplements.