Across all brands, there’s a few key takeaways of what makes a supplement brand reputable. “What builds trust for me is consistency, transparency, and alignment with published human data,” says Fazio. “No supplement replaces foundational lifestyle medicine, but when used appropriately and sourced responsibly, they can be powerful adjuncts in a comprehensive health strategy.” Below, a few helpful guidelines on what to look for.
Certifications
Certifications are crucial as a top line way to evaluate a brand. “Credible third-party certification seals on packaging, such as USP Verified from United States Pharmacopeia, certification from NSF International, or testing verification from ConsumerLab.com, indicate that the product has undergone independent evaluation for identity, potency, purity, and manufacturing quality beyond basic regulatory requirements,” says Fazio. These seals do not validate efficacy claims, but they do help confirm manufacturing standards and label accuracy.” You can also look for a COA (Certificate of Analysis). “Consumers should also review whether a company provides certificates of analysis (aka a COA) upon request, even if a formal seal is not displayed on packaging,” adds Fazio. “That adds a layer of reassurance that consumers can verify the authenticity of the ingredients listed.” A look at the certifications we look for, below.
- USP (USP Verified)
- GMP-certified (Good Manufacturing Processes)
- NSF International (NSF Certified for Sport / NSF Contents Tested & Certified)
- NPA (Natural Products Association)
- ConsumerLab approval
- Informed Choice (especially for athletes)
- Friend of the Sea certified
“These certifications indicate independent testing for purity, potency, and contaminants,” says Smith. “That said—absence of a logo doesn’t automatically mean low quality. Some high-end practitioner brands perform rigorous third-party testing but don’t pay for certification marks. Transparency is key.”
Research
Knowledge is power so it’s important to do your own research—it can help you evaluate between different brands and narrow down exactly what you’re looking for. An educated consumer is not an easily influenced consumer. “I love the NIH’s Office of Dietary Supplements,” explains Endemann. “They have the latest on research, health benefits, news, and more.”
While it’s still in the beta stages, I’ve also seen great things with the app SuppCo. It does some heavy lifting for you: their TrustScore uses a proprietary rating system to score brands and products on a 10-point scale, evaluating criteria from manufacturing standards and product certifications, to testing benchmarks and product quality indicators. From there, it can add even more data, like price per serving, user popularity, and even how it measures up to other supplements you’re taking. I especially love this feature—it helps users see how much of a certain vitamin or mineral they’re getting and offers advice or suggestions on what to take a deeper look at.
Third-Party Testing
Third-party testing is important because it is backed by multiple clinical studies, which are considered the most scientifically rigorous form of research. “Third-party testing protects consumers from three major risks: contamination (heavy metals, microbes, pesticides), mislabeling (wrong dose, wrong ingredient), and adulteration (undeclared stimulants or pharmaceuticals),” says Smith. “An independent lab verifies that what’s on the label is actually in the bottle, and in the correct amount.” Fazio adds that “an independent lab adds an additional layer of accountability and reduces reliance solely on the manufacturer’s internal quality controls or consumer discernment.”
Traceability and Transparency
“Ingredient transparency is important and something I always encourage my clients to look for when shopping for trustworthy supplement brands,” says Casavecchia. “Companies that are extremely transparent about the sourcing of all of their ingredients, sharing exactly where they’re manufacturing all ingredients, as well as the supplier name, is helpful so consumers know the exact sourcing of supplements.”
“Nutrients are only as good as their origin,” says Smith. “Traceable sourcing ensures that the botanical is correctly identified, it’s grown in clean soil, it’s harvested at the right potency, and hasn’t been contaminated during processing.” An example? “Curcumin sourced from one region may have dramatically different bioactive compound levels than another,” adds Smith. “Traceability protects both safety and efficacy.”
Minimal Additives
Unnecessary additives and ingredients can tamper or dilute a supplement’s effectiveness. “Inactive ingredients are not inherently harmful, but dyes, artificial sweeteners, and excessive fillers are largely unnecessary and provide no benefit,” says Fazio. “Some individuals are sensitive to certain additives that can contribute to gastrointestinal discomfort or immune reactivity in certain populations. A simple, clean formulation reflects intentional design.”
Dosages
Beyond ingredients, clear dosages on the label ensures you know the precise amount of each ingredient you’re consuming—which can help when looking at your levels and needs comprehensively, ensuring you’re not taking too much or too little. “Labels should clearly disclose all active ingredients and exact dosages, without relying on proprietary blends that obscure meaningful amounts,” says Fazio.
Claims
Be cautious of any extravagant claims or promises made by the supplement company—if it sounds too good to be true, it probably is. “The FDA has strict rules about claims that products may make about efficacy,” explains Endemann. “Supplements may not claim to prevent or cure any medical condition, even if evidence does exist that they may be helpful.”