Yep, humectants vs occlusives! This is why, for example, you should never apply pure hyaluronic acid on dry skin/hair: it's a humectant, which means it works b

Yep, humectants vs occlusives! This is why, for example, you should never apply pure hyaluronic acid on dry skin/hair: it's a humectant, which means it works by sealing in existing moisture. You have to apply it to damp skin/hair to get the intended benefit.