We built the standards we wished existed.
Before founding Previnex, David Block spent years as a research analyst in the nutritional supplement industry. He understood it from the inside: how products were formulated, how supply chains worked, and how little oversight stood between a label claim and what was actually in the bottle. He left that work knowing exactly what a trustworthy supplement company would have to do differently, and he founded Previnex as the answer to that question.
"I spent years analyzing this industry from the inside. And watching corners constantly being cut. I founded Previnex because I wanted products I could actually trust — and I knew if I wanted that, other people did too."
David Block
Founder & CEO, Previnex
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Pharmaceutical-grade
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Third-party tested
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COA every run
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No proprietary blends
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Transparent sourcing
How we verify every bottle.
Most supplement companies aren't required to test like this. We do it anyway. When contamination and mislabeling are industry-wide problems, testing this rigorously is how we earn the trust we're asking for.
Raw material testing
Every ingredient tested for purity, potency, and safety before entering production — regardless of how it affects cost or timeline.
100% of ingredients screened
U.S. Pharmacopeia standards
Tested for stability, disintegration, dissolution, hardness, and thickness — so your body can actually use what you take.
Faster dissolution vs. 45-min industry norm
Finished product verification
Every batch confirmed: label matches product. No fillers, no surprises. The right ingredients, at the right dosages, free from anything that should not be there.
Label-to-product match, every batch
"The industry wouldn't hold itself to a higher standard, so I built the standards that I would demand as a customer."
The PLUS Standard
Four criteria. Every product meets all of them — not as a goal, but as a requirement.
PLUS Purity
Pharmaceutical-grade.
Third-party tested.
Every batch.
PLUS Performance
Clinical ingredients.
Effective dosages.
Proven mechanisms.
PLUS Purpose
One purchase
= One donation.
Health that multiplies.
PLUS Prevention
Compounding benefits.
Built for decades, not days.
Certificate of Analysis, on every production run.
Every ingredient is tested line-by-line. Potency, safety, and purity verified and documented before a single bottle ships.
Precision at every decision point.
Standards extend beyond testing. Every formulation decision — from ingredients to forms to dosages — is aligned with our commitment to what actually works.
Clinically effective forms only
Active, bioavailable forms your body recognizes — not synthetic versions that require conversion before they're usable.
Clinically studied dosages, every time
very ingredient dosed at the level proven by human clinical studies. Never under-dosed to save on costs.