: This is the hydrogenated, stable version of squalene. It provides the same hydrating benefits but is shelf-stable , non-comedogenic (won't clog pores), and resistant to oxidation. For skincare, you should almost always buy Squalane . 2. Sourcing and Ethical Considerations

Historically, squalene was harvested from , which has devastating effects on marine ecosystems. Most reputable modern brands now use sustainable, plant-based alternatives. Squalane Oil for Skin: Benefits and How to Use It | CeraVe

: This is the natural form produced by human skin (sebum). However, it is highly unstable and oxidizes quickly when exposed to air, which can lead to clogged pores and a short shelf life. It is rarely sold in its pure form for topical use.