India, Dec. 4 -- The beauty world's must-have ingredient this year is peptides, but not the simple ones used in old anti-aging creams.

A new, advanced generation of these ingredients, boosted by celebrity endorsements (like singer Dua Lipa's DUA brand and model Hailey Bieber's Rhode lip treatment), promises to dramatically lift, tighten, and repair the skin.

This popularity has led to an even more advanced, high-tech trend called peptide stacking, which is the newest and most scientific way people are using them.

Peptides are essentially short chains of amino acids, tiny messengers that tell your skin or body what to do. They can signal collagen to rebuild, inflammation to ease, muscle recovery to accelerate or hormones to regulate. Fo...