Red Flag #1: Proprietary Blends Hiding Ingredient Doses
A proprietary blend lists multiple ingredients under a single combined weight — for example "Performance Blend 1,200mg" containing twelve separate compounds. The label discloses the total blend weight but not the amount of each individual ingredient.
Why this is a problem: an ingredient at 10mg and an ingredient at 1,190mg can appear equally on a proprietary blend label. Manufacturers use this format to include impressive-sounding ingredients at token amounts — insufficient to produce clinical effects but sufficient to allow marketing claims. Every product reviewed on WellnessChecked requires full ingredient disclosure.
Red Flag #2: Dose Mismatch with Published Research
The second most important red flag is the gap between the dose of an ingredient in the product and the dose used in the clinical research cited. KSM-66® Ashwagandha is studied at 600mg — products containing 150mg cannot be expected to replicate those results. NMN is studied at 250–500mg — a product containing 50mg is not delivering a clinically relevant dose regardless of how prominently NMN appears on the label.
Red Flag #3: No Money-Back Guarantee
Manufacturers who are confident their products produce real results offer money-back guarantees. The willingness to refund unsatisfied customers is one of the strongest quality signals available. Every supplement reviewed by WellnessChecked carries a minimum 30-day money-back guarantee. Products without a clear, enforceable guarantee should be treated with significant caution.
Red Flag #4: Exaggerated or Specific Medical Claims
Under FDA and MHRA regulations, dietary supplements cannot legally claim to diagnose, treat, cure or prevent any disease. Products making specific medical claims — "clinically proven to cure X" or "eliminates Y permanently" — are either regulatory violations or examples of deliberately misleading marketing. Legitimate supplement brands communicate benefits in terms of support, maintenance and general wellness.
Red Flag #5: No Disclosed Manufacturer or Facility Information
Legitimate supplement manufacturers disclose their identity, location and manufacturing facility details. cGMP certification from a named, verifiable facility is a positive signal. Products with no manufacturer address, no facility information and no way to verify production standards should be avoided entirely.
Red Flag #6: Sold Exclusively on Third-Party Marketplaces
If a supplement is only available through Amazon, eBay or other third-party marketplaces — and has no official manufacturer website — this is a significant warning sign. Legitimate supplement brands maintain direct-to-consumer sales channels specifically because they want to control product authenticity and offer money-back guarantees they can honour.
Red Flag #7: Before-and-After Photos Without Context
Dramatic before-and-after transformation images in supplement marketing are almost universally misleading — often showing different lighting, posture, hydration status or simply paid models. Results presented as "typical" that reflect extreme outliers are a form of deceptive advertising. Look instead for brands that present aggregated user data from verified review platforms and are transparent about realistic expected outcomes.
What Good Looks Like
Products like VigRX Plus®, Testosil® and Semenax® represent the evidence-backed end of the supplement spectrum: published clinical studies or clinically dosed patented ingredients, fully disclosed formulas, cGMP manufacturing, genuine money-back guarantees and transparent manufacturer information. This is the standard every supplement should be held to.