Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| MOTS-c | P21 (Cerebrolysin Analog) | |
|---|---|---|
| Category | Peptides | Peptides |
| Standard Dose | Research indicates 5-10 mg administered 3-5 times per week via subcutaneous injection. | Research indicates 750 mcg-1 mg daily via intranasal administration or subcutaneous injection. |
| Timing | Morning administration preferred. Can be dosed pre-workout for enhanced exercise performance. | Morning dosing preferred for cognitive effects. |
| Cycle Duration | 8-16 week cycles. | 4-8 week cycles with 4-week rest periods. |
| Evidence Level | Emerging (strong preclinical) | animal_plus_anecdotal |
MOTS-c is a 16-amino acid mitochondrial-derived peptide encoded by the 12S rRNA gene of the mitochondrial genome. It primarily acts through the folate-AICAR-AMPK pathway: by regulating the folate cycle and de novo purine biosynthesis, it increases AICAR accumulation, which phosphorylates and activates AMPK. This enhances glucose uptake in skeletal muscle, improves insulin sensitivity, and mimics exercise-mediated physiological responses. Skeletal muscle MOTS-c levels increase 11.9-fold in response to acute exercise in young men.
Research indicates 5-10 mg administered 3-5 times per week via subcutaneous injection.
Morning administration preferred. Can be dosed pre-workout for enhanced exercise performance.
8-16 week cycles.
P21 is a tetrapeptide (DGGL — Asp-Gly-Gly-Leu) derived from the most active region of ciliary neurotrophic factor (CNTF, residues 148-151), identified through reverse engineering of Cerebrolysin. An adamantylated glycine enhances BBB permeability and metabolic stability. P21 works through LIF/STAT3 pathway inhibition, BDNF/TrkB/CREB signaling enhancement, and restoration of synaptic proteins (synaptophysin, synapsin I) and glutamate receptors. It promotes neurogenesis and maturation of newborn neurons in the dentate gyrus.
Research indicates 750 mcg-1 mg daily via intranasal administration or subcutaneous injection.
Morning dosing preferred for cognitive effects.
4-8 week cycles with 4-week rest periods.
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