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Head-to-head evidence comparison — which supplement is right for you?
Vitamin A wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
9 of 18 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Chaga and Vitamin A have evidence — compare verdict strength side-by-side.
1-3g dried mushroom or 500-1500mg extract daily
Morning, Can be taken as tea or with food
Dual extraction (hot water + alcohol) extract
2500-5000 IU daily (retinol); up to 25000 IU (beta-carotene)
With fat-containing meal, Any time of day
Mixed carotenoids or low-dose retinyl palmitate
4-8 weeks
4-8 weeks
2-4 weeks
2-4 weeks
2-4 weeks
4-8 weeks
With chronic excess
Medicinal Mushrooms in Colon Cancer Therapy: Mechanisms of Action of Bioactive Compounds and Therapeutic Potential
International journal of molecular sciences (2025) · Systematic review
Therefore, there is a strong demand for innovative, affordable, and minimally invasive treatments such as medicinal mushrooms.
Effects and mechanisms of natural products on Alzheimer's disease
Critical reviews in food science and nutrition (2023) · Systematic review
Alzheimer's disease (AD) is the most common form of dementia in elderly people with a high incidence rate and complicated pathogenesis, and causes progressive cognitive deficit and memory impairment.
The Antiviral, Anti-Inflammatory Effects of Natural Medicinal Herbs and Mushrooms and SARS-CoV-2 Infection
Nutrients (2020) · Systematic review
Thus, the possibilities of natural substances as effective treatments against COVID-19 may seem promising.
Effects of primary or secondary prevention with vitamin A supplementation on clinically important outcomes: a systematic review of randomised clinical trials with meta-analysis and trial sequential analysis
BMJ open (2024) · Meta analysis · n=672
Vitamin A did not reduce mortality in individually randomised trials (RR 0.99, 95% CI 0.93 to 1.05; I²=32%; p=0.19; 105 trials; moderate certainty), and this effect was not affected by the risk of bias.
Vitamin and Mineral Supplementation During Pregnancy on Maternal, Birth, Child Health and Development Outcomes in Low- and Middle-Income Countries: A Systematic Review and Meta-Analysis
Nutrients (2020) · Meta analysis · n=451723
IFA supplementation showed notable improvement in maternal anemia and the reduction in low birthweight, whereas LNS supplementation had no apparent effect on outcomes; further research that compares LNS and MMN supplementation could help understand differences with these commodities.
Vitamin A supplements for reducing mother-to-child HIV transmission
The Cochrane database of systematic reviews (2017) · Meta analysis · n=6601
Antepartum or postpartum vitamin A supplementation, or both, probably has little or no effect on mother-to-child transmission of HIV in women living with HIV infection and not on antiretroviral drugs.
Evidence limited to systematic reviews without specific RCTs. Effects may vary significantly by extraction method - dual extracts likely more bioavailable than raw powder. Most studies are preclinical or mechanistic.
AI-estimated from published studies. Interpret as directional guidance.
Vitamin A has a higher evidence score (7/10 vs 3.5/10) and wins in 2 of 3 categories.
For healthy aging, Vitamin A has a higher relevance score (80 vs 65).
No known interactions between Chaga and Vitamin A have been documented in our database. However, always consult a healthcare provider before combining supplements.