Peptide & Nootropic Glossary
This comprehensive glossary defines key terms used throughout Dihexa.co.uk and in nootropic and peptide research. Terms are organised by category for easy reference.
Neuroscience Terms
Synaptogenesis
The formation and development of new synaptic connections between neurons. This process is critical for learning, memory formation, and neural plasticity. Compounds that promote synaptogenesis may enhance cognitive function by increasing the number of functional connections in the brain. Research into Dihexa's mechanism of action focuses heavily on synaptogenesis.
BDNF (Brain-Derived Neurotrophic Factor)
A protein that supports the growth and maintenance of neurons. BDNF is essential for neuroplasticity and plays a key role in learning and memory. Many nootropic compounds aim to increase BDNF levels. See potential benefits for more information on how this relates to cognitive enhancement.
LTP (Long-Term Potentiation)
A persistent strengthening of synapses that occurs after repeated stimulation. LTP is considered a cellular mechanism underlying learning and memory formation. Compounds that enhance LTP may improve cognitive performance and information retention.
Blood-Brain Barrier (BBB)
A highly selective, semi-permeable membrane that separates circulating blood from the brain and central nervous system. The BBB is critical for protecting the brain but also creates challenges for delivering therapeutic compounds. Peptides must cross or work around the BBB to affect brain function.
Neuroplasticity
The ability of the brain to reorganize and form new neural connections throughout life. Neuroplasticity underlies learning, memory, and recovery from brain injury. Nootropic compounds like those discussed in Dihexa information may enhance neuroplasticity.
Dendritic Spine
A small protrusion on dendrites where synaptic connections form. Dendritic spines are sites of synaptic plasticity and are critical for learning. Changes in dendritic spine density correlate with learning and memory performance.
Hippocampus
A brain region critical for forming new memories and for learning. The hippocampus is one of the first areas affected in Alzheimer's disease. Many Dihexa studies focus on hippocampal function and plasticity.
AMPA Receptor
A type of glutamate receptor found on the surface of neurons. AMPA receptors are crucial for fast synaptic transmission and are involved in LTP. Some compounds enhance AMPA receptor trafficking to strengthen synapses.
Neuroprotection
Mechanisms that protect neurons from damage, degeneration, or death. Neuroprotective compounds may reduce neuroinflammation, oxidative stress, or excitotoxicity—factors implicated in neurodegenerative diseases like Alzheimer's.
Molecular Biology & Protein Terms
HGF (Hepatocyte Growth Factor)
A signaling protein that binds to the c-Met receptor to trigger cell growth, survival, and migration. In the brain, HGF and c-Met signaling supports neuronal survival and plasticity. This pathway is central to understanding Dihexa's proposed mechanism.
c-Met Receptor
A cell surface receptor that binds HGF and is activated by the HGF/c-Met signaling cascade. c-Met activation promotes neuron survival, growth, and synaptogenesis. Dihexa is hypothesised to act as an agonist at c-Met.
Angiotensin IV
A peptide hormone derived from angiotensin II that enhances memory formation and synaptic plasticity. Angiotensin IV activates AT4 receptors and shares some structural and functional properties with Dihexa.
Oligopeptide
A peptide molecule composed of a small number of amino acids (typically 3-20). Dihexa is an oligopeptide. Oligopeptides are larger than individual amino acids but smaller than full proteins.
Peptide
A molecule composed of two or more amino acids linked by peptide bonds. Peptides are intermediates between amino acids and proteins. Many biological signaling molecules are peptides.
mEPSC (Miniature Excitatory Postsynaptic Current)
Spontaneous synaptic currents recorded at the receiving end of a synapse. mEPSCs reflect the strength of individual synaptic connections. Increased mEPSC amplitude or frequency indicates synaptic strengthening.
Pharmacology Terms
Oral Bioavailability
The percentage of an orally administered compound that reaches systemic circulation in active form. High oral bioavailability means a larger portion of the dose is absorbed and available to produce effects. Peptides typically have poor oral bioavailability due to stomach acid and digestive enzymes.
Prodrug
A compound that is inactive until metabolised in the body into an active form. Some compounds are designed as prodrugs to improve absorption or target delivery. This term is relevant to understanding peptide pharmacokinetics.
Half-Life
The time it takes for the concentration of a compound in the body to reduce by half. A shorter half-life means more frequent dosing may be required; a longer half-life allows less frequent dosing.
CYP450 (Cytochrome P450)
A family of enzymes in the liver responsible for metabolising most drugs and xenobiotics. CYP450 activity affects drug clearance, half-life, and potential drug interactions. Peptides are typically not metabolised by CYP450 but by proteolytic enzymes.
Bioavailability
The degree and rate at which an administered substance becomes available at the site of action. Bioavailability is affected by absorption, distribution, metabolism, and excretion (ADME).
Nootropic
A compound that enhances cognitive function with minimal side effects and low toxicity. Classic nootropics meet criteria including memory enhancement, neuroprotection, and improved cerebral blood flow. Dihexa's potential benefits are evaluated against nootropic criteria.
Research Methods & Analytical Terms
COA (Certificate of Analysis)
A document from an analytical laboratory certifying the purity, identity, and composition of a chemical compound. A COA includes test results from methods like HPLC or mass spectrometry. See research chemicals guide for how to evaluate COAs.
HPLC (High-Performance Liquid Chromatography)
An analytical technique that separates and quantifies components in a sample. HPLC is widely used to test purity of research chemicals. See the HPLC section in our buying guide for details.
In Vitro
Research conducted in a laboratory setting outside a living organism, typically in cells or tissues cultured in dishes. In vitro studies are useful for mechanistic investigation but may not translate to in vivo effects.
In Vivo
Research conducted within a living organism, such as in animal models or humans. In vivo studies better approximate real-world physiology but are more complex and ethically constrained.
Preclinical
Research conducted before human trials, typically including laboratory and animal model studies. Preclinical evidence for Dihexa exists but human clinical data is limited.
Phase 1/2/3 Clinical Trial
Stages of human drug testing. Phase 1 tests safety in small groups; Phase 2 tests efficacy and monitors side effects; Phase 3 compares to standard treatments in larger populations. Dihexa has not completed Phase 3 trials. See research and studies for the current status.
Scopolamine Model
A research model in which scopolamine (an anticholinergic drug) is used to impair memory in animals, creating a model of cognitive dysfunction. Compounds are tested to see if they can reverse scopolamine-induced memory impairment.
Transgenic Mouse Model
Laboratory mice genetically modified to carry specific genes or mutations. Transgenic models of Alzheimer's disease are used to test compounds. These models approximate aspects of human disease but may not fully replicate it.
Regulatory & Legal Terms
WADA (World Anti-Doping Agency)
An international authority that sets standards for prohibited substances in sport. Dihexa is banned by WADA, meaning athletes cannot use it in competition. This reflects regulatory caution regarding novel peptides.
MHRA (Medicines and Healthcare Products Regulatory Agency)
The UK regulatory authority responsible for approving medicines and monitoring safety. The MHRA has not approved Dihexa as a licensed medicine. See UK legal status for more information.
Research Chemical
A chemical compound sold "for research purposes only" that is not approved for human consumption. Research chemicals occupy a legal grey zone; they are not controlled but are not licensed medicines. See research chemicals guide for more detail.
Additional Resources
For more information on how these terms relate to Dihexa specifically, visit: