Serum purifiant

Contains salicylic acid like the source but it's buried lower in the ingredient list alongside niacinamide and many extras, suggesting a lower/different concentration and a more complex formula overall.

Salicylic acid is present but it's a minor player behind glycolic and lactic acid, making this primarily an AHA glycolic serum rather than a BHA purifying serum like the source.

Salicylic acid appears but far down the list behind niacinamide and brightening actives, so this is really a brightening serum with a trace of BHA, not a purifying salicylic acid treatment.

No salicylic acid at all; this is a scalp serum built around willow bark, ginger oil, and fragrance components, entirely different from the source's simple BHA formula.

No salicylic acid or any BHA; this is a peptide/hyaluronic acid hydrating glaze serum, a completely different category from the source's purifying acid serum.