skin thickness ranges from just 0.5mm on eyelids to over 4mm on the back, requiring calibrated formulations with penetration enhancers for optimal ingredient delivery
journal entries
lab report: posterior neglect - the overlooked back skin science
studies show people spend 90% of body care time on the front of the body while neglecting the back, yet back skin has unique needs,...
lab report: the thick skin paradox - why thicker areas get drier
skin barrier on elbows, knees and heels is up to 40% thicker yet more prone to dryness due to fewer oil glands and increased friction
lab report: humidity response variations across body regions
different body zones respond uniquely to summer humidity with limb skin remaining dry despite increased moisture while facial skin may overproduce oil
lab report: body hyperpigmentation science - why knees and elbows darken
melanocyte activity differs across body regions, making knees, elbows and underarms more prone to hyperpigmentation due to friction and thinner skin
lab report: summer body acne science - understanding heat-triggered oil production
summer increases body acne incidence by 46% primarily on back, chest and shoulders due to larger sebaceous glands and heat-responsive oil production
lab report: male body skin science - understanding father's day skincare needs
male body skin has 15-20% higher collagen density but significantly lower lipid content, explaining extreme dryness despite "thicker" skin
lab report: nighttime body repair - why circulation matters for ingredient delivery
overnight blood flow to limb skin decreases by up to 30% compared to facial skin, requiring higher concentrations of active ingredients
lab report: friction zones - protecting high-contact areas from daily damage
areas of constant friction experience up to 5,000 rubbing contacts daily, disrupting barrier function and requiring specialized protection
lab report: the oil gland deficit in body skin compared to facial skin
body skin has fewer oil glands than facial skin, creating natural dryness that requires specialized care with science-backed ingredients