The Ordinary's 100% Plant-Derived Hemi-Squalane is half the molecular weight of 100% Plant-Derived Squalane. What's different: - Price: 100% Plant-Derived Hemi-Squalane is $3.95 whereas original 100% Plant-Derived Squalane is $7.90 - Molecular weight: Hemi-Squalane is even lighter and has a "drier" feel/touch - Hemi-Squalane is 100% derived from sustainable sugarcane; original Squalane is just plant-derived (doesn't specify from what plant). What's the same: - Suitable for all skin and hair types - Product features: oil-free, alcohol-free, nut-free, vegan, cruelty-free, non-comedogenic