Lanosterol (Standard) is the analytical standard of Lanosterol, primarily used for quantitative analysis and metabolic research. Lanosterol is the first sterol intermediate in the cholesterol biosynthetic pathway, synthesized from squalene via squalene epoxidase. It plays a pivotal role in lipid homeostasis by inducing the ubiquitination and proteasomal degradation of HMG-CoA reductase (HMGCR), the rate-limiting enzyme of the pathway. Beyond its metabolic function, Lanosterol exhibits potent molecular chaperone-like activity, inhibiting the aggregation and associated cytotoxicity of misfolded proteins linked to neurodegenerative diseases and cataracts.