What Is Systematic Review?
A comprehensive, structured review of all available research on a specific question, using pre-defined criteria to identify, evaluate, and synthesise relevant studies. Distinguished from a meta-analysis in that it does not necessarily involve statistical pooling of data.
Why It Matters for Supplement Brands
Systematic reviews provide a complete picture of the evidence landscape for an ingredient. They help identify gaps, inconsistencies, and the overall quality of research — critical context for substantiation decisions.
How It Works
A systematic review follows a rigorous methodology:
1. **Research question**: A clearly defined question using the PICO framework (Population, Intervention, Comparison, Outcome). 2. **Search strategy**: Comprehensive searches across multiple databases (PubMed, Cochrane, Embase) with documented search terms. 3. **Inclusion/exclusion criteria**: Pre-defined criteria for which studies to include. 4. **Quality assessment**: Each included study is rated for risk of bias using validated tools (e.g., Cochrane Risk of Bias tool). 5. **Qualitative synthesis**: A narrative summary of findings across all included studies.
A systematic review may include a meta-analysis (quantitative pooling of data), but not all systematic reviews do — some present findings qualitatively only.
Common Mistakes to Avoid
- ✗Treating a narrative literature review as equivalent to a systematic review — the methodology is very different
- ✗Citing a systematic review's conclusion without checking the quality of the underlying studies
- ✗Not checking whether the systematic review's inclusion criteria match your product's form and dose
- ✗Confusing 'systematic review' with 'meta-analysis' — all meta-analyses are systematic reviews, but not all systematic reviews include meta-analysis
Related Terms
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