How We Choose Products
WellGuide is an independent editorial resource that helps people make informed choices about supplements and wellness products on iHerb. Every product featured in our recommendations goes through a rigorous multi-step analysis. We don't simply rewrite product descriptions from the store โ we study formulations, compare alternatives, analyze scientific data, and consider real buyer experiences.
Our goal is to save you time and help you avoid poor purchases. We strive to make every recommendation evidence-based, transparent, and genuinely useful.
Evaluation Criteria
Every product is assessed against four key criteria:
๐ฌ Ingredients & Formulation
We analyze the quality of active ingredients, checking their bioavailability and form. For example, magnesium glycinate is better absorbed than magnesium oxide, and methylcobalamin is a more active form of vitamin B12 than cyanocobalamin. We verify dosages against recommendations from scientific organizations, check for unnecessary fillers, artificial colors, and common allergens.
๐ฐ Value Per Serving
The price of a bottle is not the best indicator of value. We calculate the cost per serving (or per day of use) so you can accurately compare different products. Often a larger package or a lesser-known brand turns out to be significantly more cost-effective while maintaining the same formulation quality.
โญ Brand Reputation
We consider the brand's track record, quality certifications (GMP, NSF, USP, IFOS), third-party testing results, and overall reputation within the supplement community. Brands that undergo independent testing and publish Certificates of Analysis (COA) receive additional merit in our evaluations.
๐ฅ Customer Reviews
We study real customer reviews on iHerb: average ratings, review volume, feedback on effectiveness, taste, tolerability, and convenience of use. We pay particular attention to negative reviews to identify any systemic product issues.
Selection Process
Our product selection follows several stages:
- Category definition: We choose a topic or need (e.g., "vitamin D3 for immune support") and compile a list of all relevant products on iHerb.
- Initial screening: We filter out products with low ratings (below 4.0), few reviews, questionable formulations, or from unknown manufacturers without certifications.
- Detailed analysis: Each remaining candidate undergoes a full evaluation across all four criteria: ingredients, value, brand, and reviews.
- Comparison & ranking: We compare finalists against each other and determine the best options for different needs and budgets.
- Editorial review: The final list is verified for accuracy, current pricing, and availability on iHerb.
Independence
WellGuide does not accept payment from brands for product placement in our recommendations. No brand or manufacturer can pay to be included in our "Top Picks" list or to receive a favorable review. Our recommendations are based solely on the results of our independent analysis.
We participate in the iHerb affiliate program, meaning we earn a small commission on purchases made through our links. However, this commission is the same for all products and in no way influences our selections. The price you pay remains unchanged.
Updates
We regularly review and update our recommendations. Typically, a full review of each category occurs at least once per quarter. Additionally, we update information when:
- A manufacturer changes a product's formula or formulation
- There is a significant price change
- New meaningful scientific research is published
- A competitive new product enters the market
- Ratings shift or widespread negative reviews emerge
The date of the last update is displayed on each recommendation page.