BTHE + Huperzine A

**BTHE + Huperzine A** appears to be a combination formula, with one component being **Huperzine A**. Huperzine A is a natural Lycopodium alkaloid isolated from Huperzia serrata and related species. It acts as a reversible acetylcholinesterase inhibitor, thereby increasing the levels of acetylcholine in the brain and is also a noncompetitive antagonist of the NMDA receptor. These actions are thought to contribute to its putative cognitive-enhancing effects and its use in traditional medicine and as a nootropic supplement for memory and concentration enhancement. Huperzine A is approved for use in China for Alzheimer's disease but is sold as a dietary supplement in other regions[1][5]. There is insufficient information available from the search results to determine what "BTHE" refers to specifically; it may be another herbal or supplemental ingredient or a brand-specific formulation.