Certwell surfaces products certified by seven programmes from five independent bodies (NSF, USP, LGC, IFOS, and Nutrasource). Each requires manufacturers to submit products for testing — certification is not self-declared. The schemes differ in what they test for and how often, so the right certification depends on what the product is and how you intend to use it.
Important: absence of certification does not mean a product is unsafe. It means the product has not been independently verified by one of these bodies. Many good products are not certified. Certification adds assurance — it is not a requirement for a safe supplement.
Batch-level screening against 290+ banned substances, plus identity, potency, and contaminant testing. The certification most often cited by professional sports leagues.
Best for: Athletes in tested sports. Protein, pre-workout, sports supplements.
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Verifies identity, potency, purity, and dissolution against United States Pharmacopeia standards. The dissolution test in particular is uncommon among supplement schemes.
Best for: Everyday vitamins and minerals. Multivitamins, vitamin D, magnesium.
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UK-run, ISO 17025-accredited. Every batch is tested against the WADA banned-substance list. Lot codes are searchable in a public database.
Best for: UK athletes. Strongest brand uptake among UK and European sports brands.
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LGC programme using monthly blind sampling rather than every-batch testing. Same banned-substance scope as Informed Sport, looser cadence — closer to a routine surveillance programme.
Best for: Recreational and amateur athletes wanting independent banned-substance assurance.
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LGC programme that verifies the protein content claim on the label, with banned-substance screening included. Targets the protein category specifically.
Best for: Buying whey or plant protein and wanting independent confirmation that the protein claim is honest.
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Per-batch testing of fish oil and omega-3 products for EPA/DHA potency, PCBs, heavy metals, and oxidation. Reports are published publicly with a 1–5 star rating.
Best for: Fish oil and other omega-3 supplements — a category with high rates of mislabelling.
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Lab-based detection of GMO material using PCR (DNA) and ELISA (protein) at sub-0.1% sensitivity. Goes beyond supplier-declaration non-GMO labelling.
Best for: Soy- and corn-derived supplements where GMO variants are common.
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The schemes are complementary, not competing. A few practical rules of thumb: