India, Dec. 11 -- The new generation of peptides has become this year's beauty must-have. Boosted by celebrity endorsements like Dua Lipa's DUA brand and Hailey Bieber's Rhode lip treatment, they promise to dramatically lift, tighten, and repair the skin. Their popularity has led to a more high-tech trend called peptide stacking, which is the latest, most science-driven way beauty enthusiasts are using them. Peptides are 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. For years, dermatologists have used them for targeted repair. Peptides were already popular, but stacking pushed them into a new kind of virality, with wellness creators like Yuri Lee showcasing rows of droppers, pastel serums, and peptide vials in their routines. "Social media made stacking visible because people started showing faster improvements," explains dermatologist Dr Prachi. On the wellness side, stacking taps into the current longevity culture, where creators share their approaches to metabolic health and gut repair. Peptides have a powerful effect on the body's hormonal and cellular signalling, and combining multiple types can cause those signals to overlap or interfere. Dermatologist Dr Deepali Bhardwaj notes that not all peptide pairings work well. With injectables especially, mixing peptides without strict medical guidance can trigger mood fluctuations, dizziness or disrupted sleep. Some people also experience shifts in insulin response, blood sugar imbalance, or added strain on the liver and kidneys. Even the skin can react, showing redness, irritation, or sudden breakouts....