Pregnenolone is an endogenous steroid hormone synthesized primarily in the adrenal glands, liver, and gonads. It belongs to the chemical class of neurosteroids and serves as a precursor to various other steroid hormones, including progesterone, glucocorticoids, mineralocorticoids, androgens, and estrogens. Often referred to as the 'mother hormone,' pregnenolone plays a crucial role in the biosynthesis of these hormones. Researchers have been investigating its potential roles in various physiological processes and its implications in health and disease. Pregnenolone is primarily studied for its involvement in neuroprotection, cognitive enhancement, and mood regulation. It has been observed to influence memory and learning, and there is ongoing research into its potential therapeutic roles in neurodegenerative diseases such as Alzheimer's disease. Additionally, pregnenolone's role in stress response and its potential anxiolytic effects are areas of active investigation. The mechanism of action of pregnenolone involves its conversion into other steroid hormones, which then exert effects through their respective receptors. Pregnenolone itself is believed to modulate the activity of neurotransmitter receptors, including NMDA and GABA receptors, influencing neuronal excitability and synaptic plasticity. Its actions on these receptors contribute to its neurosteroid classification and its potential effects on the central nervous system. Pharmacokinetically, pregnenolone has a circulating half-life of approximately 20 to 30 minutes. It undergoes extensive first-pass metabolism, which limits its oral bioavailability. The compound is metabolized primarily in the liver, and its metabolites are excreted via the kidneys. Researchers have observed that pregnenolone's pharmacokinetics can vary based on the route of administration. Clinically, pregnenolone is not widely used as a therapeutic agent, and its regulatory status varies by country. It is not approved by the FDA for any specific medical indication, and its use is primarily limited to research settings. Pregnenolone is available as a dietary supplement in some regions, but its efficacy and safety for various health conditions remain under investigation.