Research Methodology and Editorial Standards

SighedEffects.com operates as an evidence-based supplement and nutrition information resource. This document outlines our research methodology, source evaluation criteria, editorial standards, and quality control processes. Our approach draws from established practices in academic research, library and information science, and evidence-based medicine.

Core Principles

Evidence-Based Analysis: All content relies on verifiable, credible sources rather than marketing claims, industry promotion, or algorithmic content generation.

Source Transparency: Citations link directly to peer-reviewed research, authoritative health organizations, or credibly authored expert sources. Readers can verify any claim independently.

Editorial Independence: We maintain no commercial relationships with supplement manufacturers, distributors, or retailers. The site operates without affiliate links, advertising, or sponsored content.

Scientific Rigor: Claims are proportionate to evidence strength. We distinguish between “unproven” (insufficient evidence either way) and “proven ineffective” (evidence demonstrates lack of effect).

Ongoing Verification: Articles undergo continuous review. Errors are corrected immediately upon identification. Content updates reflect new research as it emerges.

Information Hierarchy and Source Selection

Research methodology in library and information science establishes clear hierarchies for evaluating sources. We apply these principles to supplement and nutrition research.

Primary Sources

Primary sources constitute the foundation of evidence-based content. These represent original research and firsthand documentation:

Peer-Reviewed Research Articles:

Randomized controlled trials (RCTs)
Systematic reviews and meta-analyses
Observational studies (cohort, case-control)
Clinical trials registered with ClinicalTrials.gov
Pharmacokinetic and pharmacodynamic studies
In vitro and animal studies (when human data unavailable)

Authoritative Organizations:

National Institutes of Health (NIH)
Food and Drug Administration (FDA)
World Health Organization (WHO)
Centers for Disease Control and Prevention (CDC)
United States Pharmacopeia (USP)
European Food Safety Authority (EFSA)

Government Documents:

Congressional testimony
Regulatory filings and decisions
Official guidance documents
Public health advisories

We access peer-reviewed literature primarily through PubMed/MEDLINE, the National Library of Medicine’s database of biomedical literature. PubMed provides reliable access to indexed, peer-reviewed journals and allows verification of publication details, author affiliations, and citation networks.

Secondary Sources

Secondary sources analyze, synthesize, or interpret primary research. We use these selectively:

Acceptable Secondary Sources:

Medical textbooks from established publishers
Clinical practice guidelines from professional medical societies
Systematic reviews in peer-reviewed journals
Evidence syntheses from organizations like Cochrane Collaboration
Meta-analyses published in reputable journals

Quality Criteria:

Published within the last 5-10 years (unless discussing historical context)
Authors with relevant expertise and disclosed affiliations
Transparent methodology
Comprehensive literature review
Acknowledged limitations

Tertiary Sources

Tertiary sources compile information from primary and secondary sources. We generally avoid these except under specific circumstances:

Acceptable Tertiary Sources:

Expert-authored content where the author holds relevant doctoral-level credentials (PhD, MD, PharmD) in the subject area
Content from credentialed professionals writing within their area of expertise
Educational materials from academic medical centers
Patient information from major medical institutions (Mayo Clinic, Cleveland Clinic, Johns Hopkins)

Excluded Tertiary Sources:

Influencer content without credible expertise
Algorithm-generated listicles
Marketing blogs
Uncredentialed health and wellness sites
Commercial supplement vendor educational content
Social media health claims

The critical distinction: expertise and verifiability. A blog post by a nutrition PhD discussing metabolism is acceptable; a fitness influencer’s supplement recommendations are not.

Evidence Evaluation Framework

Not all research carries equal weight. We apply established evidence hierarchies when evaluating claims.

Hierarchy of Evidence

Tier 1 – Strongest Evidence:

Systematic reviews and meta-analyses of randomized controlled trials
Large, well-designed randomized controlled trials
Meta-analyses of observational studies (for questions where RCTs are unethical or impractical)

Tier 2 – Moderate Evidence:

Individual randomized controlled trials
Well-designed cohort studies
Case-control studies with adequate controls

Tier 3 – Weaker Evidence:

Observational studies without controls
Case series and case reports
Cross-sectional studies
Animal studies (for mechanisms, not efficacy claims)
In vitro studies (for mechanisms, not efficacy claims)

Tier 4 – Insufficient for Claims:

Expert opinion without systematic evidence review
Anecdotal reports
Testimonials
Marketing materials
Undisclosed or unpublished studies

Study Quality Assessment

Beyond study design, we evaluate methodological quality:

Sample Size and Power: Studies must demonstrate adequate statistical power to detect meaningful effects. Small studies (n<20) receive limited weight unless they are pilot studies acknowledged as preliminary.

Randomization and Blinding: For interventional studies, we assess randomization methods and blinding procedures (single-blind, double-blind, triple-blind). Unblinded studies receive appropriate caveats.

Control Groups: Studies must include appropriate controls. Comparisons against placebo are standard; active comparator trials provide additional context.

Outcome Measures: We prioritize clinically meaningful outcomes over surrogate markers. For example, fracture reduction carries more weight than bone density changes alone.

Follow-Up Duration: Study duration must be adequate for the outcome measured. Acute studies cannot support chronic use claims.

Conflict of Interest: We note funding sources and author affiliations. Industry-funded research is not automatically excluded but receives additional scrutiny and is noted in context.

Publication Venue: Journal impact factor and editorial standards matter. We verify journals are indexed in PubMed and have legitimate peer review processes.

Statistical Interpretation

We evaluate statistical reporting for:

Effect Sizes: Statistical significance (p-values) differs from clinical significance. We report effect sizes and confidence intervals where available.

Multiple Comparisons: Studies testing multiple outcomes require correction for multiple comparisons. Uncorrected analyses receive appropriate skepticism.

Subgroup Analyses: Post-hoc subgroup findings are noted as exploratory unless pre-specified.

Absolute vs. Relative Risk: We report absolute risk reductions, not just relative risk, to provide meaningful context.

Source Verification Process

Every citation undergoes verification before publication and during content updates.

Citation Verification Steps

1. Source Location: Citations must link to verifiable sources. We obtain full text when possible, not just abstracts. PubMed provides PMID numbers and links to publisher full text or PMC free versions.

2. Accuracy Check: We verify that cited material actually supports the claim made. Misrepresentation of study findings is a common problem in health content; we read sources in full to confirm accuracy.

3. Context Verification: Individual studies exist within broader research contexts. We check whether:

Findings have been replicated
Subsequent research contradicts earlier conclusions
Systematic reviews provide synthesis
The study represents consensus or outlier findings

4. Date Verification: Publication dates matter. A 1985 study may be historically important but does not represent current evidence. We note when citing older research and verify whether findings remain accepted.

5. Retraction Check: We verify studies have not been retracted or corrected. Retraction Watch and PubMed retraction notices flag problematic research.

6. Author Credentials: We verify author affiliations and expertise match the subject matter.

Example: Citation Verification in Practice

When developing our Vitamin D article, a citation claimed “a 70-year-old makes approximately 25% as much vitamin D from sun exposure as a 20-year-old.” Verification revealed the actual study (MacLaughlin & Holick, 1985) stated “aging can decrease by greater than twofold the capacity of the skin to produce previtamin D3.”

The original claim was imprecise. We corrected the text to accurately reflect the study: “A 70-year-old has more than a twofold reduction in previtamin D3 synthesis compared to young adults under identical sun exposure conditions.”

This exemplifies our verification standard: claims must precisely match source material.

Handling Conflicting Evidence

Research frequently produces conflicting findings. Our approach to contradictory evidence:

Present the Controversy: When legitimate scientific debate exists, we acknowledge it. For example, optimal vitamin D blood levels remain debated between the Institute of Medicine (30-50 ng/mL sufficiency) and the Endocrine Society (≥30 ng/mL with 40-60 ng/mL potentially optimal for some).

Weight of Evidence: We indicate which position has stronger evidentiary support while noting the debate continues.

Temporal Context: Scientific consensus evolves. We note when recent evidence contradicts older studies and explain why perspectives have shifted.

Quality Over Quantity: Ten poor-quality studies do not outweigh one well-designed systematic review. We weight evidence by quality, not volume.

Plausible Mechanisms: We consider whether conflicting findings might reflect different populations, doses, formulations, or outcome measures rather than true contradiction.

Medical Claims and Legal Boundaries

We maintain clear boundaries regarding medical claims:

What We Do:

Provide factual information about supplements based on research evidence

Explain mechanisms of action supported by peer-reviewed research

Summarize clinical trial findings

Compare supplement options based on quality, formulation, and evidence

Discuss safety considerations and contraindications documented in literature

Present information to support informed decision-making

What We Do Not Do:

Diagnose medical conditions

Recommend specific treatments for diseases

Advise stopping or starting medications

Make health claims beyond what research supports

Replace medical advice from healthcare providers

Recommend supplements for treating diagnosed conditions

We include disclaimers where appropriate. For example: “Potassium supplements can cause fatal cardiac arrhythmias and should only be used under physician supervision. Do not take potassium supplements without medical guidance.”¹

This represents verifiable, consensus medical knowledge documented in medical literature and FDA warnings, not medical advice to any individual.

Content Development Process

Article development follows systematic methodology:

Topic Selection

Topics are selected based on:

Availability of peer-reviewed research
Consumer interest and search behavior
Gaps in existing evidence-based resources
Supplement categories with quality concerns requiring clarification

We do not cover topics without sufficient evidence base. If research is insufficient, we may still cover the topic while explicitly acknowledging evidence limitations and explaining what is unknown.

Research Phase

Literature Search: We conduct comprehensive literature searches using PubMed/MEDLINE with relevant MeSH (Medical Subject Headings) terms and keywords. Searches typically include systematic reviews, meta-analyses, and recent RCTs.

Source Collection: We compile relevant studies, noting:

Publication date
Study design
Sample size
Key findings
Limitations
Funding sources

Evidence Synthesis: We identify patterns across studies:

Consistent findings
Contradictory evidence
Gaps in research
Quality of available evidence

Writing Phase

Claim Substantiation: Every factual claim requires citation to a verifiable source. Claims are proportionate to evidence:

“Research demonstrates…” (strong, replicated evidence)
“Studies suggest…” (moderate evidence with some limitations)
“Preliminary research indicates…” (early-stage evidence)
“Evidence is insufficient…” (when research is limited or contradictory)

Quantitative Precision: We report specific values with appropriate context:

“Vitamin D3 was 87% more effective than D2 at raising serum 25(OH)D levels” (specific finding from meta-analysis)
Not: “Vitamin D3 is much better than D2”

Mechanistic Explanations: When explaining biological mechanisms, we cite peer-reviewed research demonstrating the mechanism, distinguish between in vitro, animal, and human evidence, and note when mechanisms are theoretical vs. demonstrated.

Safety Information: Contraindications, drug interactions, and adverse effects are documented with clinical evidence and referenced to medical literature, not speculation.

Review Phase

Accuracy Check: All factual claims are verified against cited sources. Citations are checked for accuracy and accessibility.

Consistency Check: Information is verified for internal consistency across the article and consistency with related articles on the site.

Completeness Check: We verify that coverage includes relevant aspects: mechanisms, dosing, safety, interactions, quality considerations.

Clarity Check: Technical information is explained accessibly without sacrificing accuracy. We define specialized terms and provide context for clinical data.

Publication and Maintenance

Initial Publication: Articles are published after completing verification and review processes.

Ongoing Updates: Articles are reviewed periodically and when new significant research emerges. Updates reflect current evidence.

Correction Policy: Errors are corrected immediately upon identification. We do not maintain error logs publicly but work to ensure all live content reflects current evidence and accurate source interpretation.

Smart Stack Tool Methodology

The Smart Stack Builder differs from typical supplement recommendation engines by basing suggestions on peer-reviewed research rather than commercial partnerships.

Database Structure

The Smart Stack tool operates on a Flask API backend with a structured database containing:

Supplement Profiles: Each supplement entry includes:

Ingredient identity and common names
Mechanisms of action (research-supported)
Clinical evidence for various applications
Dosing ranges from clinical trials
Safety considerations and contraindications
Bioavailability considerations
Quality markers (standardization, forms)

Evidence Links: Database entries use supporting peer-reviewed research. Recommendations reflect evidence strength.

Interaction Matrices: The database includes documented interactions between different supplements and nutrition profiles based on published research. Common warnings about supplement combinations are noted where evidence supports them.

Recommendation Algorithm

The Smart Stack tool uses deterministic processes:

User Input Processing: Users provide information about health goals and current physical conditions (ie: height, age, weight).

Criteria Matching: The system matches user criteria against database entries using coded logic based on:

Evidence for specific health goals
Absence of contraindications
Appropriate dosing ranges
Quality considerations

Output Generation: Recommendations are generated based on evidence strength and user-specific factors. The tool does not recommend specific brands or products: only generic supplement types and evidence-based dosing.

Transparency: Users receive information about why specific supplements are recommended (or not recommended) based on their inputs and the evidence.

No Commercial Conflicts

The Smart Stack tool contains no product recommendations, affiliate links, or commercial relationships. Recommendations are based solely on research evidence and user-provided information. We do not receive compensation from any manufacturer for inclusion or exclusion of supplements.

Quality Assurance Standards

Citation Format

All citations follow a consistent format with author names, article titles, journal names, publication years, volume, issue, and page numbers. Where available, we include DOI numbers or PubMed IDs.

Citations link directly to:

PubMed entries (preferred for peer-reviewed research)
Official organization websites (for guidelines and position statements)
Government document repositories (for regulatory information)
Source of information

We do not cite press releases, news articles about research, or secondary reporting unless discussing media coverage itself.

Internal Consistency

Information must be consistent across articles. When we state a fact in multiple articles (e.g., “vitamin D deficiency affects 1 billion people worldwide”), the citation and specific claim match across all uses.

Accessibility of Sources

We prioritize sources accessible to readers:

PubMed abstracts (freely available)
PMC full-text articles (free access)
Official organization websites (public access)

Paywalled journals are cited when they are the best source, but we note when abstracts provide sufficient information for verification.

Expertise and Qualifications

Content development draws on graduate-level training in research methodology, information science, and systematic literature evaluation. This background informs:

Source evaluation and credibility assessment
Database searching and literature review techniques
Information organization and synthesis
Critical appraisal of research methodology
Understanding of peer review and publication processes

This training aligns with established practices in evidence-based medicine and academic research.

Scope and Limitations

What We Cover

Evidence-based information about:

Dietary supplements (vitamins, minerals, herbs, amino acids, other compounds)
Supplement quality and testing standards
Mechanisms of action supported by research
Clinical evidence for supplement use
Safety considerations and interactions
Bioavailability and formulation factors
Comparison of supplement forms and types

What We Acknowledge

Evidence Limitations: When research is limited, contradictory, or preliminary, we state this explicitly. Absence of evidence is not evidence of absence. We distinguish between “unproven” (insufficient research either way) and “proven ineffective” (research demonstrates lack of effect).

Individual Variation: Supplement effects vary between individuals based on genetics, health status, medications, and other factors. Our content addresses population-level evidence, not individual responses.

Research Evolution: Scientific understanding evolves. Current evidence may be superseded by future research. We update content as evidence changes.

Complexity: Nutrition and supplementation involve complex biological systems. Reductionist approaches have limitations. We acknowledge complexity while providing actionable information.

Differentiation from Algorithm-Driven Content

The supplement information landscape contains substantial low-quality content:

Common Problems We Avoid:

Influencer recommendations without evidence basis

Algorithm-generated listicles lacking source verification

Affiliate-driven content promoting specific products for commission

Marketing content disguised as educational material

Uncritical repetition of supplement marketing claims

Oversimplified “superfood” narratives

Failure to distinguish evidence quality

Our Approach:

Every claim requires verifiable source

Commercial independence (no affiliate relationships)

Evidence strength explicitly noted

Limitations and contradictions acknowledged

Quality and safety considerations included

Differentiation between proven, unproven, and disproven

This reflects professional research standards rather than content optimization for algorithms or affiliate revenue.

User Trust and Transparency

Verification Invitation

Readers can verify any claim by:

Following citation links to original sources
Checking PubMed entries for cited research
Reviewing systematic reviews that synthesize evidence
Consulting cited organizational guidelines

We provide sufficient citation detail for independent verification.

Feedback and Corrections

Errors identified by readers are investigated and corrected if confirmed. We maintain email contact for error reporting and questions about sources.

No Hidden Relationships

We disclose that:

We maintain no affiliate relationships with supplement retailers or manufacturers. If this changes, it will be expressly stated immediately.
The Smart Stack tool generates revenue through direct user fees, not product sales or referrals
No content is sponsored or influenced by commercial interests
Article topics are selected based on evidence availability and user interest, not commercial partnerships

Alignment with Search Quality Guidelines

This methodology aligns with established principles for evaluating health information quality:

Expertise: Content draws on research methodology training and systematic literature evaluation skills from graduate education in information science and research methods.

Authoritativeness: Citations link to peer-reviewed research and authoritative health organizations. Claims are proportionate to evidence strength.

Trustworthiness: Commercial independence, transparent methodology, verifiable sources, and immediate error correction build trust.

YMYL (Your Money Your Life) Standards: Health information directly affects decision-making. We apply rigorous standards appropriate for consequential information: extensive source verification, evidence-based claims only, medical claim boundaries, safety information prominently featured, and acknowledgment of limitations.

Continuous Improvement

Research methodology evolves. We continuously refine:

Source Evaluation: As new databases and research repositories emerge, we incorporate them into research processes.

Evidence Standards: We monitor methodological advances in evidence synthesis and systematic review.

Quality Metrics: We track citation accuracy, source accessibility, and content comprehensiveness.

User Needs: Search behavior and user questions inform topic selection and content depth.

Conclusion

This methodology establishes systematic, verifiable, evidence-based practices for developing supplement and nutrition information. Every claim links to credible sources. Every citation undergoes verification. Every article maintains commercial independence.

The goal is not perfection—science itself is an iterative process with evolving evidence. The goal is rigorous methodology that prioritizes accuracy, transparency, and user trust over algorithmic optimization, affiliate revenue, or promotional goals.

Readers deserve supplement information based on research evidence rather than marketing. This methodology ensures that standard is maintained consistently across all content.

References

1
Saad SM, Yasin S, Jain N, LeLorier P. Cardiac Manifestations in a Case of Severe Hyperkalemia. Cureus. 2021 Mar 1;13(3):e13641. doi: 10.7759/cureus.13641. PMID: 33824794; PMCID: PMC8012067.