Bryan Johnson called cerebrolysin "the best subjective neuro-enhancer" he's tried, then added that it produced no measurable biomarker improvement. Phase 1: 5mL IM every other day (10 injections over 20 days). Phase 2: 5mL IM daily for 3 months. Porcine-derived, so not suitable for pork allergies. The gap between subjective experience and objective data is the interesting part here.