Lactic acid
ChemicalSubstanceA dual-action AHA: exfoliates via desmosome disruption and replenishes NMF as a humectant. Better tolerated than glycolic acid at equivalent efficacy.
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14 entities found starting with L Clear filters
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Lamellar body secretion
BiologicalProcessThe calcium-triggered exocytosis event at the stratum granulosum–stratum corneum interface that delivers ceramide precursors, enzymes, and antimicrobial peptides into the extracellular space.
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LED therapy
MedicalTherapyLED light therapy uses visible and near‑infrared wavelengths to activate mitochondrial photoreceptors, boosting collagen, calming inflammation, improving barrier repair, and targeting C. acnes.
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Leptin
ProteinSatiety hormone produced by fat cells that signals energy sufficiency to the brain; levels drop during caloric restriction.
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Linoleic Acid
MolecularEntityAn essential omega-6 fatty acid with a specific structural role in the stratum corneum's lamellar lipid architecture. Precursor to GLA, DGLA, and arachidonic acid in the omega-6 metabolic pathway.
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Lip
AnatomicalStructureThe lip is the most dynamically expressive structure in the lower face and among the earliest to register the visual signs of ageing.
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Lip care occlusive and emollient agents
ChemicalSubstanceOcclusive and emollient agents that reduce TEWL and restore intercellular lipids in lips, addressing their thin barrier and lack of sebum to prevent dehydration and structural dryness.
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Lip vulnerability
MedicalConditionLips requiring external lipid sources and protective barriers due to lacking oil-producing glands found elsewhere on the face.
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Lipid synthesis
BiologicalProcessThe biological process by which skin cells produce ceramides, cholesterol, and fatty acids - the structural lipid building blocks of the stratum corneum's protective barrier.
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LL-37
ProteinA cationic antimicrobial protein that kills pathogens, shapes the skin microbiome, and can drive inflammation when overexpressed.
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Loricrin
ProteinThe dominant structural protein of the cornified envelop, co-suppressed with filaggrin by IL-4/IL-13, with NRF2 partially compensating for its loss through increased lipid barrier secretion.
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Low-carbohydrate diet
MedicalTherapyDietary approach limiting carbohydrates below 130g daily, potentially supporting natural GLP-1 production and appetite regulation.
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Lumi-Pro Lips
MedicalTherapyLumi-Pro Lips works by restoring the lip's own hydration capacity from within — delivering free HA chains that attract and bind water molecules in the tissue.
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Lympho-epithelial Kazal-type-related inhibitor
ProteinA serine protease inhibitor produced by granular layer keratinocytes whose primary function is the precise spatial and quantitative regulation of KLK5, KLK7, and KLK14 activity in the stratum corneum.