The 6 Best Ingredients to Tighten Your Skin

Retinol (vitamin A) is an over-the-counter retinoid that can be helpful in smoothing skin texture and firming the skin. "One way retinoids work is by inhibiting 'matrix metalloproteinases,' which are the enzymes that break down collagen in the skin," Dr. Woolery-Lloyd explained. "Prescription products with retinoids like tretinoin and tazarotene are helpful. Over-the-counter products with retinol — such as the Specific Beauty Intensive Skin Brightening Serum ($50) — may also be helpful."

For a splurgy but highly effective option, we also recommend the new Joanna Vargas Super Nova Serum ($285), an all-natural retinol serum that celebs swear by.