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Week 1–2: corneometry shows roughly 25 percent more moisture and skin gets a fresh-glass sheen. Week 4–8: biopsies reveal a 0.28 mm dermal-thickness rise and elastin up 15 percent, translating to a tighter jawline and softer folds. Ultrasound finds 70 percent of these gains intact at six months and 50 percent at nine. Smokers or heavy sun lovers often add a third visit at month 3; low-stress lifestyles can stretch results to month 10. Any over-fill fades in days because the HA isn’t cross-linked, yet the collagen boost lingers well beyond gel resorption.