The problem with these proprietary blends is that you can't be sure how much of each ingredient you're getting per serving. This means if you're having a bad interaction with a compound, it's difficult to say which one is causing it as you're not getting an accurate representation of each individual ingredient.

Are proprietary blends good?

Proprietary blends make sense for supplement manufacturers. It gives them the perfect opportunity to hide what goes into their blends, meaning they have the freedom to combine various elements and to use low-quality ingredients.

What is proprietary blend?

A "proprietary blend" is a combination of ingredients used exclusively by one supplement manufacturer. No other company produces the exact same combination of ingredients, and, in most cases, it is difficult to know from the label the exact amounts of each of the ingredients in that blend.