Our Methodology

How We Research Supplements

We take a systematic, evidence-based approach to evaluating supplements. Here’s how we develop our recommendations.

Evidence Hierarchy

We evaluate evidence using a hierarchy of reliability:

Highest Quality

  1. Systematic Reviews & Meta-Analyses — Combine results from multiple studies
  2. Randomized Controlled Trials (RCTs) — Gold standard for establishing causation
  3. Large Cohort Studies — Observational but with many participants

Moderate Quality

  1. Smaller Clinical Trials — Valuable but may have limitations
  2. Case-Control Studies — Comparing groups retrospectively
  3. Mechanistic Studies — Understanding how something works

Lower Quality (Supporting Only)

  1. Animal Studies — Inform potential mechanisms but don’t confirm human effects
  2. In Vitro (Cell) Studies — Basic science, far from clinical application
  3. Traditional Use — Historical context, not proof of efficacy

Not Evidence

  • Testimonials and anecdotes
  • Celebrity endorsements
  • Marketing claims
  • “Research shows…” without citations

How We Rate Evidence

For each claim, we consider:

Strength of Evidence

  • Strong: Multiple RCTs, meta-analyses, consistent results
  • Moderate: Some RCTs with positive results, or consistent observational data
  • Emerging: Limited human trials, but promising mechanisms or animal data
  • Weak: Mostly animal studies, in vitro, or conflicting results

Quality of Studies

  • Sample size (larger is better)
  • Study duration (especially important for chronic use)
  • Funding sources (industry-funded studies may have bias)
  • Methodology (proper blinding, controls, endpoints)

Consistency

  • Do different studies reach similar conclusions?
  • Are results replicated across populations?
  • Are there conflicting studies, and why?

Our Research Process

1. Literature Review

We search:

  • PubMed and medical databases
  • Cochrane Library for systematic reviews
  • Examine.com (comprehensive supplement database)
  • Recent clinical trials

2. Source Evaluation

We assess:

  • Study quality and methodology
  • Potential biases
  • Applicability to real-world use
  • Consistency across multiple studies

3. Practical Application

We translate research into:

  • Specific dosage recommendations
  • Timing and form suggestions
  • Expected timelines for results
  • Important interactions and warnings

4. Ongoing Updates

We continuously:

  • Monitor new research
  • Update recommendations when evidence changes
  • Note when consensus shifts

What We Include in Each Article

For Individual Supplements

  • Mechanism of Action: How it works in the body
  • Benefits: What research supports (and how strongly)
  • Dosage: Evidence-based recommendations
  • Best Forms: Which forms absorb best
  • Timing: When to take for optimal effects
  • Results Timeline: How long until you notice benefits
  • Side Effects: What to watch for
  • Interactions: With other supplements and medications
  • Quality Indicators: What to look for when buying

For Stacks/Combinations

  • Why They Work Together: Mechanisms of synergy
  • Dosing Protocol: How to combine effectively
  • Timing: Optimal schedule
  • Warnings: What to avoid

For Medication Guides

  • Nutrient Depletions: What the medication uses up
  • Supportive Supplements: What may help
  • Dangerous Interactions: What to absolutely avoid
  • Protocol: How to supplement safely

Our Limitations

We’re transparent about what we don’t know:

Individual Variation

  • Genetics affect response
  • Health conditions change outcomes
  • What works for most may not work for you

Research Gaps

  • Many supplements lack large human trials
  • Long-term effects often unknown
  • Combinations rarely studied together

Evolving Science

  • Recommendations may change as new research emerges
  • We update content, but may not catch everything immediately

Not Personalized

  • We provide general guidance
  • Your specific situation may require different approaches
  • We can’t replace individual medical advice

Quality Standards for Recommendations

Before recommending a supplement, we consider:

Efficacy

  • Is there good evidence it works?
  • For what specific conditions/goals?
  • How strong is the effect?

Safety

  • What are the risks?
  • Who should avoid it?
  • What interactions exist?

Practicality

  • Is it affordable?
  • Are quality products available?
  • Is the protocol realistic?

Necessity

  • Can this be achieved through diet?
  • Is supplementation actually needed?
  • What’s the alternative?

Sources We Trust

Primary Sources

  • Peer-reviewed journals (JAMA, Lancet, etc.)
  • NIH databases
  • Cochrane Collaboration

Trusted Secondary Sources

  • Examine.com (rigorous, regularly updated)
  • ConsumerLab.com (independent testing)
  • Office of Dietary Supplements (NIH)

Sources We Approach Cautiously

  • Supplement company websites
  • Influencer recommendations
  • Studies funded by manufacturers

Transparency

We believe in full disclosure:

  • We use affiliate links (clearly labeled)
  • We note when evidence is limited
  • We update content when we learn new information
  • We welcome corrections and feedback

Contact Us

Found an error? Have a study we should consider? Let us know:

Email: contact@supplementguide.co

We’re committed to accuracy and appreciate help maintaining it.