(3S,4E)-4-formyl-3-(2-oxoethyl)-4-hexenoic acid 2-(4-hydroxyphenyl)ethyl ester, commonly known as oleocanthal, is a naturally occurring secoiridoid derivative found in extra virgin olive oil. It is characterized by a phenolic moiety (tyrosol ester) linked to a dialdehydic structure, which is responsible for its distinctive pungent, peppery taste. Oleocanthal is a bioactive phytochemical with significant pharmacological interest. It exhibits potent anti-inflammatory properties by inhibiting cyclooxygenase (COX) enzymes in a manner analogous to ibuprofen. Research has identified its potential neuroprotective effects, including the inhibition of tau protein aggregation and amyloid-beta oligomerization, suggesting relevance in Alzheimer's disease. It also demonstrates anti-cancer activity against various cell lines through mechanisms involving apoptosis induction and cell cycle arrest. Due to its natural origin and promising bioactivity profile, oleocanthal is studied as a potential lead compound or active pharmaceutical ingredient (API) for nutraceutical and pharmaceutical applications targeting inflammation, neurodegenerative diseases, and cancer. Its stability and bioavailability are active areas of investigation.