The US supplement market hit $74.15 billion in 2025 — growing 7.1% — and is projected to approach $100 billion by 2029. That's a massive market. It's also a market where consumer trust has historically been low — and where it's becoming a competitive advantage for brands that play the transparency game.
Key takeaways
- US supplement market: $74.15B in 2025, ~$100B by 2029
- 63% of supplement buyers now check third-party certifications before purchasing
- NARB ruling against NAD+ longevity claims: a signal of regulatory tightening
- Third-party testing (NSF, Informed Sport, USP) shifting from premium signal to consumer expectation
- Winning brands: transparency-first positioning, full ingredient disclosure, no proprietary blends
Why transparency became a commercial advantage
The supplement sector has long operated with opaque proprietary formulas, unsubstantiated marketing claims, and loose regulation in most markets. That model is eroding on two fronts: regulatory pressure and shifting consumer behavior.
On the regulatory front: in 2026, the NARB ruling against NAD+ brands claiming to «reverse cellular aging» created precedent. Those claims can no longer be made without solid clinical data. The FTC has increased enforcement against unsubstantiated sports nutrition claims. In Europe, EFSA maintains an authorized claims list that blocks most standard marketing language.
On the consumer front: 63% of regular supplement buyers now verify third-party certifications before buying — a significant increase since 2020. Gen Z and Millennials, who represent market growth, have particularly low tolerance for unsubstantiated marketing.
The certifications that matter
Not all certifications are equal. The 2026 hierarchy:
NSF International (Sport): The most recognized certification for professional athletes. Certifies absence of banned substances per WADA/USADA lists. Required for federation sponsors and brands targeting pro markets.
Informed Sport (LGC): UK equivalent to NSF for the European market. Adopted by premium brands operating across both Atlantic markets.
USP Verified: Certifies purity, potency, and composition — that ingredients are what the label says at the stated doses. More accessible than NSF, sufficient for general consumer markets.
COAs (Certificates of Analysis): For brands not yet third-party certified, publishing batch COAs (independent lab tests per batch) is the accessible first step toward transparency.
What winning brands do differently
Brands gaining market share in 2026 premium sports nutrition share several practices:
- Open formulas: All doses for all ingredients, no «proprietary blends» that hide under-dosing
- Declared sourcing: Raw material origins, certified suppliers, traceable supply chain
- Accessible COAs: Batch test results available online or on request
- Calibrated claims: Don't claim more than clinical data supports — even if regulation doesn't yet prevent it
- No fake before/afters: Brands caught on manipulated imagery lose more in trust than they gain in acquisition
These aren't just marketing advantages — they create defensive asymmetry. A brand that has built its reputation on transparency is far less vulnerable when regulation tightens or a competitor gets caught.