4 Best Face-Tightening Serums That Can Reverse Sagging Skin 

1. Neutrogena Rapid Wrinkle Repair Retinol Chacon sees retinol as a "dermatologist-recommended type of vitamin A" therefore a "potent ingredient in this anti-wrinkle serum that fights fine lines, dullness, wrinkles, and dark spots."

The $30.99 Neutrogena serum "contains hyaluronic acid," which Chacon says provides "plumping moisture to help hydrate and revitalize the appearance of skin." Chacon advises "applying to a clean face and neck two times per day."

Overnight Sensation™ Gentle Retexturizing Solution by Thrive Causemetics This serum is ideal for mature women over 40 with sensitive skin or who find retinol too harsh. "I personally recommend the Bigger Than Beauty Skincare Overnight Sensation Gentle Retexturizing Solution to my clients with specific anti-aging needs," Lévy.

"Not only does it have bakuchiol, an excellent retinol alternative, it also has blend of 10% AHA + BHA to help with pore minimizing, pore tightening, skin texture, overall gentle but efficient exfoliation

Urban Skin Rx Advanced Even Tone Day/Night Treatment Kung recommends this serum-like solution for reducing obstinate dark spots and acne scars over 40 and encouraging supple skin.  

"Some skincare ingredients that have been scientifically and clinically studied to help with discoloration include kojic acid, tranexamic acid, and bakuchiol, which are all found in this product,

Senté Bio Full Serum Kung recommends this "complete" nightly serum for women over 40. "I'm a simple skincare person who just wants to use one product after cleanser

and before moisturizer to take care of all my skin care concerns - discoloration, fine lines and wrinkles, and skin barrier repair," she says, explaining why this serum works.