Vitamin Brand Index

In-House Testing Benefits

Why running quality tests inside your own facility can raise standards and boost consumer trust.

Self-Manufactured

Most supplement brands don’t make their own products. They hire third-party factories. Those factories make supplements for dozens, sometimes hundreds, of other companies. So the brand you think you’re buying from often has little to do with what’s happening on the production floor.

When a brand self-manufactures, the game changes. They own the equipment. They run the processes. They control the environment. And most importantly—they can test everything themselves.

Here’s why that matters:

The Outsourcing Reality

Most brands outsource their manufacturing. That means they depend on certifications to prove those third-party factories are meeting quality standards. In practice, that’s like renting someone else’s kitchen and hoping they followed your recipe exactly. Some do it well. Others don’t. Either way, the brand is one step removed from the work that actually matters.

Certifications That Back It Up

This is where certifications come in. Programs like GMP (Good Manufacturing Practices), USP, and NSF International hold manufacturers accountable to consistent quality and safety standards…and, ideally, to the brand’s own mission. Other seals: Certified Organic, Non-GMO Project Verified, Gluten-Free, Vegan, etc. signal additional quality assurances that matter to certain buyers.

Why This Matters to You

Because you’re the one swallowing the pill. At the end of the day, what goes into your body is your choice. Some people care about price. Others care about brand story. And some care about who actually makes the product. There’s no right or wrong here.

This site just gives you the facts so you can line them up with what matters to you. Whether self-manufactured is a deal-breaker or just “nice to have,” at least you’ll know.

Do your own research. Trust your own judgment. That’s the point.