Muscle
Synthesis, performance, recovery
Muscle is the body's largest metabolic organ and the one most under your control. Building and repairing it is protein-limited — you need enough total protein, and the leucine within it, to trigger muscle protein synthesis — while vitamin D governs the contractile machinery and is reproducibly tied to strength and fall risk. Creatine refills the rapid-energy system for short bursts, magnesium guards against cramping, and iron delivers the oxygen working muscle demands. Muscle mass is now one of the strongest predictors of healthy aging, so this system is as much about longevity as performance.
How your supplements + diet cover this system right now — the nutrients feeding it, where the gaps are, and your own lab readouts.
The load-bearing nutrients — if these are deficient, this system shows symptoms first. Click any to see daily targets, top food sources, and supplements that supply it.
Lab markers that report on this system’s health.
Save a lab session under My Journey → Biomarkers to see your own values for these.
Where the biochemistry happens for this system.
Systems that share a load-bearing nutrient with this one.