Human hair can almost fully recover its structure within about 1,000 minutes after being stretched.
September 2015 in “The European physical journal. E, Soft matter and biological physics/The European physical journal. E, Soft matter” Longer time setting curls overnight leads to better curl retention.
3 citations,
September 2005 in “International Journal of Cosmetic Science” Different oils penetrate hair differently; monounsaturated oils like olive oil penetrate better than polyunsaturated oils.
October 2024 in “Acta Biomaterialia” Collagen makes skin stiff, and preservation methods greatly increase tissue stiffness.
22 citations,
May 2021 in “Nature Communications” Tissue stiffness affects hair follicle regeneration, and Twist1 is a key regulator.