MOTS-c (Mitochondrial ORF within the 12S rRNA Type-C) is a peptide encoded within the mitochondrial genome itself — one of a class of mitochondria-derived peptides that act as systemic metabolic messengers. NAD+ (Nicotinamide Adenine Dinucleotide) is the coenzyme central to all mitochondrial energy production and the substrate for sirtuins — the proteins that regulate cellular stress response, DNA repair, and metabolic efficiency. Both decline with age, and both are targets of protocols aimed at maintaining cellular energy and cognitive performance.
MOTS-c: The mitochondrial messenger
MOTS-c is released from mitochondria under metabolic stress and travels to the nucleus and other tissues to regulate gene expression and metabolic adaptation. Its primary studied effects include AMPK pathway activation — a cellular energy sensor that promotes fat burning, glucose uptake, and mitochondrial biogenesis. MOTS-c has also demonstrated insulin sensitising effects in animal studies and has been proposed as a mediator of exercise-induced metabolic adaptation, with plasma levels rising during physical activity.
NAD+: The energy coenzyme and its decline
NAD+ is required for the function of the electron transport chain — the mitochondrial process that converts nutrients into ATP, the cellular energy currency. Beyond energy production, NAD+ is the substrate for sirtuins (SIRT1-7), which regulate metabolic efficiency, DNA damage repair, and cellular stress responses. NAD+ levels decline by approximately 50% between young adulthood and middle age, and this decline correlates with reduced mitochondrial function, impaired DNA repair, and the metabolic deterioration associated with biological ageing. NMN (Nicotinamide Mononucleotide), as used in the N500 Focus protocol, is a NAD+ precursor that raises cellular NAD+ levels through the salvage biosynthesis pathway.
The combined FOCUS rationale
MOTS-c and NAD+ precursors address mitochondrial function from different angles. MOTS-c works on metabolic signalling and adaptation — improving how cells sense and respond to energy demand. NAD+ precursors work on the substrate level — ensuring the coenzyme required for energy production and cellular maintenance is available in sufficient quantity. Together they target the upstream drivers of the cellular energy decline that underlies both metabolic and cognitive performance deterioration with age.