Lesson 1Humectants: examples (glycerin, propanediol, sodium PCA), mechanism and suitability for sensitive skinThis lesson looks at moisture keepers like glycerin, propanediol, and sodium PCA, explaining how they hold water, work in mixes, affect skin feel, and fit for sensitive or weak skin barriers.
Glycerin as main moisture keeperPropanediol and other smoothsSodium PCA and skin match mixesLess stick and feel balanceMoisture keepers in weak skinLesson 2Antioxidants and chelators: examples (tocopherol, EDTA), role in oxidative stability and preservationThis lesson explains how fighters against rust and metal binders like tocopherol and EDTA protect oils and actives from air damage, help keep fresh, and last long without hurting skin feel or clear look.
Oil phase rust fightersWater phase fighters and team workBinders for small metalsEffect on color and smell steadyMaking rust fight systems in oil-waterLesson 3Occlusives: examples (dimethicone, hydrogenated polyisobutene), balancing occlusion and light feelThis lesson talks about blockers like dimethicone and hydrogenated polyisobutene, showing how to balance skin cover, less water loss, and light, easy feel for daily sensitive skin care.
Dimethicone types and skin feelHydrogenated polyisobutene in creamsWater loss cut and skin measuresAvoid heavy and block poresBlock levels for day and nightLesson 4Soothing/anti-irritant actives: examples (niacinamide, panthenol, dipotassium glycyrrhizate), evidence and typical use rangesThis lesson checks calm and anti-hurt actives like niacinamide, panthenol, and dipotassium glycyrrhizate, summing ways they work, proof, match, and usual amounts in sensitive skin creams.
Niacinamide for skin and red helpPanthenol for moisture and fixDipotassium glycyrrhizate calm workUse amounts and pH matchMixing calm actives safeLesson 5Core functional groups for O/W moisturizer: role of solvent, humectant, emollient, occlusive, emulsifierThis lesson maps main work groups in oil-water creams—solvents, moisture keepers, softeners, blockers, and mixers—showing how each adds to feel, moisture, steady, and take in sensitive skin mixes.
Water part and co-solvent pickMoisture mix design and amountsSoftener part build and feelBlock agents and skin helpMixer system and part balanceLesson 6Preservative systems for mild formulas: examples (phenoxyethanol+ethylexylglycerin, sodium benzoate+potassium sorbate), rationale for sensitive skinThis lesson reviews keep-fresh systems for soft oil-water creams, like phenoxyethanol with ethylhexylglycerin and acid salts, focusing on cover, pH needs, rule limits, and sensitive skin take.
Phenoxyethanol and help in mixesSodium benzoate and potassium sorbatepH spaces for acid systemsKeep fresh work vs softCut sting and sense riskLesson 7Emollients: examples (caprylic/capric triglyceride, C12-15 alkyl benzoate), sensory and absorption considerationsThis lesson looks at softener choices like caprylic/capric triglyceride and C12-15 alkyl benzoate, linking build to spread, take rate, left over, and fit for light, no-grease sensitive skin creams.
Medium spread esters and fatsQuick take vs rich softenersPull and color or filter wetStick, shine, and after feel controlSoftener picks for spot skinLesson 8Solubilizers, pH adjusters, and texture modifiers: examples and impact on performanceThis lesson reviews key solvers, pH changers, and feel changers in oil-water creams, explaining how they affect clear, thick, spread, and whole work while keeping comfort on sensitive skin.
No-charge solvers for smell and oilspH change for skin matchHolds and pH move controlFlow changers and thick tuneSlide, spread, and pick up bestLesson 9Common incompatibilities and ingredient substitution strategiesThis lesson covers usual no-match in oil-water creams, like pH, charge, and rust issues, and gives real swap ways to keep steady, soft, and work when changing sellers or actives.
pH cause un-steady and breakCharge fights between partsRust easy oils and activesKeep fresh and chain fightsMaking strong swap plansLesson 10Emulsifiers and co-emulsifiers: examples (polyglyceryl esters, glyceryl stearate SE), HLB considerations and mildnessThis lesson details mixers and co-mixers, like polyglyceryl esters and glyceryl stearate SE, explaining HLB ideas, needed HLB of oil parts, and how to make soft, steady systems for sensitive skin creams.
Needed HLB of oil partNo-charge mixers for softPolyglyceryl esters in oil-waterFat drinks as co-mixersBest drop size and steady
