Focus Dissolving Strips (Semax · NAD+ · Methylene Blue)

Semax — signalling

Semax is the ACTH(4–10) fragment extended with a C-terminal Pro-Gly-Pro tail, a modification that removes the corticotropic activity of the parent hormone and slows exopeptidase cleavage. Rodent studies have reported increased BDNF and NGF expression in hippocampus and cortex, changes in TrkB receptor signalling and altered monoamine turnover, with behavioural work centred on attention, learning acquisition and memory retention.

NAD+ — cofactor availability

NAD+ carries electrons through glycolysis, the TCA cycle and oxidative phosphorylation, and is consumed stoichiometrically by sirtuins, PARPs and CD38. Because those enzymes turn it over continuously, tissue NAD+ pools are dynamic, and the NAD+/NADH ratio is widely used as an index of metabolic state alongside oxygen-consumption rate and ATP output in mitochondrial studies.

Methylene blue — electron transport

• At low concentrations it has been studied as an alternative electron carrier that can shuttle electrons within the mitochondrial respiratory chain.
• Its behaviour is concentration-dependent in published work — reported effects at low concentrations differ from those at higher ones, a hormetic pattern investigators are explicit about.
• It is also studied as a monoamine oxidase inhibitor and as a classical redox indicator in biochemical assays.
• Its strong absorbance can interfere with colorimetric readouts, which experimental design has to account for.

Why the three appear together

Each addresses a different layer of the same question: Semax at the level of neurotrophic signalling, NAD+ at cofactor availability, methylene blue at electron flux. A combined film is an exploratory arm rather than a mechanistic one — it cannot attribute an observed change to any single component. Designs that need attribution should run single-compound formats in parallel.

Format and evidence limits

Store the pack sealed, cool and dry, out of direct light — thin-film matrices are hygroscopic and will tack or curl once exposed to humidity. Remove one strip at a time with clean dry forceps or dry gloved hands and reseal immediately. Methylene blue stains readily, so work over a protected surface, keep gloves dry and clean spills promptly with water before the dye sets. For dispersion work, drop the strip into the aqueous medium and let it dissolve without aggressive stirring, and remember that the dye's absorbance can interfere with colorimetric or fluorescence readouts. Record the pack lot number against your COA and dispose of unused strips under institutional chemical waste procedure.