Why don't collagen creams, drinks, or supplements fix sagging skin?

Sagging happens in the dermis - deep below the surface - where collagen and elastin fibres break down over time. Topical creams can't reach there; the molecules are too large to penetrate the skin barrier. Collagen supplements are broken down by digestion and distributed wherever your body needs them - not necessarily your face. To rebuild firmness, you need a technology that physically reaches those dermal cells directly. That's what medical-grade laser does.