This site contrasts its approach with formulas that list 10+ ingredients at unclear individual doses.
The site argues a long list makes it hard to know which ingredient is doing anything, and often includes trendy but less-researched botanicals. It positions four well-researched ingredients as the focused alternative.
It is a design argument, not proof of better results. The site does not claim a clinical trial of the finished product, and amounts remain undisclosed, so "focused" describes ingredient count rather than demonstrated effect.