Liz Song 10/27/26 Liz Song 10/27/26

Glycolic vs Lactic vs Mandelic Acid: Choosing Your AHA Ingredient

Glycolic, lactic or mandelic acid? How each AHA differs in strength, irritation and pH, plus the US sunburn alert and Korea's AHA label rules.

Liz Song 10/4/26 Liz Song 10/4/26

Collagen in K-Beauty: The Ingredient Founders Love to Overclaim

Hydrolyzed, marine, recombinant or vegan collagen? What each does in a K-beauty formula, which US claims are safe, and what to ask your Korean ODM.

Liz Song 10/3/26 Liz Song 10/3/26

Glutathione in Korean ODM Skincare: A Founder Sourcing Guide (2026)

Glutathione is K-beauty's hot brightening active, but reduced GSH is unstable in water. How indie founders source and formulate it from Korean ODMs.

Liz Song 10/1/26 Liz Song 10/1/26

Liposomes vs Cyclodextrins vs Microcapsules for K-Beauty Actives

Liposomes, lipid nanoparticles, cyclodextrins or microcapsules? How each protects retinol, the EU nano and microplastics rules, and what to ask your ODM.

Liz Song 9/23/26 Liz Song 9/23/26

Squalane in Korean K-Beauty: An Indie Founder's 2027 Sourcing and Formulation Guide

Squalane sourcing from Korean ODMs: sugarcane vs olive, MFDS and MoCRA compliance, formulation grade, and the one-page ODM brief indie K-beauty founders need.