Proprietary blend
A group of ingredients listed together under one combined name and total weight, without disclosing how much of each individual ingredient is inside. Proprietary blends are legal, but they make it impossible to know the dose of most individual ingredients inside the blend from the label alone (required nutrients such as vitamins and minerals still carry their own amounts).
Example
27.2% of on-market products (33,203 of 121,959) declare at least one proprietary blend -- see the full breakdown, including which compounds are most often hidden inside one, on the Proprietary Blends report.