Why Methodology Matters

Most supplement review sites don’t publish a methodology. That’s not an accident — it’s because most supplement review sites don’t have one.

Rankings are determined by affiliate commissions. Products are reviewed without being tested. Scores are assigned without criteria. And readers have no way of knowing any of this because there is nothing published that would expose it.

At BestRatedSupps.com, we do things differently. This page exists because we believe you deserve to know exactly how we arrive at every ranking, score, and recommendation we publish — before you read a single review.

Who Does the Testing

All reviews and rankings on BestRatedSupps.com are conducted by Sarah Caldwell, an independent supplement researcher and Certified Clinical Nutritionist (CCN) with 12 years of clinical experience in metabolic health, gut function, hormonal balance, and weight management.

Sarah purchases every product she reviews independently, at retail price. No products are gifted, sponsored, or provided free of charge in exchange for coverage. When a product is provided free of charge for any reason, this is disclosed explicitly in the review.

For full details on Sarah’s background and credentials, see her Sarah Caldwell.

The 5-Step Evaluation Process

Every supplement reviewed on BestRatedSupps.com goes through the same five-step process — regardless of brand size, price point, or how heavily a product is marketed.

Step 1 — Independent Purchase

Every product is purchased at full retail price through the official brand website or an authorized retailer. We do not accept free samples, sponsored shipments, or review units from brands.

This matters because brands that provide free products for review have a documented tendency to receive more favorable coverage — consciously or not. Paying full price eliminates that dynamic entirely.

Step 2 — Label and Formulation Analysis

Before testing begins, we conduct a complete analysis of the product label and formulation. This includes:

Ingredient identity — we verify that every active ingredient is clearly identified by its specific chemical form, not hidden behind a proprietary blend that obscures individual dosages.

Dosage assessment — we compare the dosage of each active ingredient against the amounts used in peer-reviewed clinical trials. A product that contains berberine at 200mg when the clinically studied dose is 1,500mg per day is noted and scored accordingly.

Bioavailability — ingredient form matters as much as dose. We assess whether each compound is in a form the body can actually absorb and utilize. For example, magnesium glycinate has significantly higher bioavailability than magnesium oxide. These distinctions are evaluated and explained in every review.

Inactive ingredients — we review fillers, binders, coatings, and excipients for any ingredients that raise concern for specific populations, including common allergens, artificial additives, and compounds with known interactions.

Manufacturing standards — we verify whether the product is manufactured in a GMP-certified facility and whether it has been independently tested by a third-party organization such as NSF International, USP, or Informed Sport.

Step 3 — Clinical Literature Review

We review the peer-reviewed scientific literature on every key ingredient in the formula. Our research process includes:

Primary sources — we read original studies from PubMed, NIH, and peer-reviewed journals. We do not rely on brand-provided research summaries, press releases, or secondary aggregators.

Study quality assessment — not all research is equal. We weight randomized controlled trials more heavily than observational studies, and human clinical trials more heavily than animal or in-vitro research.

Population relevance — we assess whether the study population is relevant to our readers. A trial conducted on elite athletes has limited applicability to a 45-year-old with metabolic resistance. This context is explained in every review.

Dosage alignment — we compare the dose used in clinical studies to the dose present in the product. When a product uses a sub-clinical dose of a key ingredient, this is flagged clearly.

Consistency of evidence — a single positive study is not sufficient to validate a mechanism. We look for consistency across multiple independent studies before drawing conclusions about efficacy.

Research sources we reference regularly include:

• PubMed / NCBI
• NIH Office of Dietary Supplements
• Mayo Clinic
• Examine.com
• ConsumerLab
• WebMD
• NSF International

Step 4 — Personal Testing

Following formulation analysis, each product is used personally by Sarah for a minimum of four weeks. During this period:

• The product is used as directed on the label
• No other new supplements are introduced during the testing period to isolate variables
• Subjective and observable outcomes are documented throughout
• Any side effects, tolerability issues, or unexpected responses are recorded

Four weeks is the minimum testing period because many supplements — particularly those targeting metabolic function, gut microbiome, hormonal balance, or cognitive performance — require sustained use before meaningful outcomes are observable. Shorter testing periods produce unreliable data.

Where a product requires longer use to assess efficacy accurately (for example, testosterone support supplements), testing is extended beyond four weeks before a final review is published.

Criterion 5 — Value and Transparency (20%)

We evaluate:

• Price per serving relative to formulation quality
• Strength and terms of the money-back guarantee
• GMP certification and third-party testing verification
• Clarity and honesty of marketing claims
• Company responsiveness and customer service reputation
• Availability and accessibility of purchasing

Score Interpretation