Substrate, cell volume & training capacity
One of 6 mechanistic pathways to 💪 Build muscle & strength · 17 options
The unglamorous pathway, and the one with the strongest evidence base by an enormous margin. You cannot signal your way past insufficient protein, depleted phosphocreatine or a workout you couldn't finish.
The unglamorous checks that explain most stalled progress. Low ferritin and low B12 both present as 'I just can't train hard any more' with a completely normal full blood count.
Comprehensive Metabolic Panel (CMP)Complete Blood Count (CBC) with DifferentialFerritinVitamin B12Magnesium, RBC🏋️ Athletic Performance & Recovery covers these in one panel →
What engages this pathway
Ordered by how directly each one acts on the mechanism above — never by how much trial evidence exists. Each links to its full breakdown with dosing, half-life and vendor.
🧬 Creatine
Expands the phosphocreatine pool so more ATP is available for high-intensity work, plus a cell-volumising effect that is itself a hypertrophy signal. Hundreds of trials. Nothing else here is close.
🧬 Creatine HCL
More soluble than monohydrate. The claimed advantage is gastric comfort at lower doses; no trial shows superior outcomes, and monohydrate is the studied form.
🧬 Creatine + Alpha-GPC
Creatine's substrate effect plus Alpha-GPC's demonstrated power-output improvement — two different mechanisms in one product.
🧬 Whey Protein (RecoveryPro)
Fast leucine delivery, the strongest acute mTOR stimulus available from food. Total daily protein matters more than timing, but this is how most people reach total.
🧬 Casein Protein
Slow-digesting micellar casein sustains amino-acid availability for hours — the overnight argument, which has modest but real support.
🧬 Plant Protein
Pea/rice blends complement each other's limiting amino acids. Needs a slightly higher dose to match whey's leucine.
🧬 Essential Amino Acids
The nine that must be eaten. Efficient when total protein is constrained; redundant when it isn't.
🧬 HMB
Reduces protein breakdown. Best evidence in untrained or catabolic populations.
🧬 Betaine Anhydrous (TMG)
Trimethylglycine improves power output and body composition in several resistance-training trials; the methyl-donor and osmolyte roles are both plausible mechanisms.
🧬 Beta-Alanine
Raises muscle carnosine, buffering the hydrogen ions that end a set. The benefit is specific to 1–4 minute efforts — meaning higher training volume, not direct anabolism.
🧬 Citrulline Malate
Raises plasma arginine more effectively than arginine does, increasing nitric-oxide-mediated blood flow and reducing perceived exertion across a session.
🧬 Peak ATP
Oral ATP doesn't reach the muscle intact — it acts extracellularly on purinergic receptors to raise blood flow. Small human trials show improved training volume.
🧬 Agmatine
An arginine metabolite that modulates nitric-oxide synthase. The pump effect is the claim; the human evidence is thin.
🧬 Nitrosigine
Inositol-stabilised arginine silicate with better bioavailability than plain arginine and human data for blood flow and cognition.
🧬 Glycerol (HydroMax)
Hyperhydrates the muscle cell osmotically. Real, measurable, and mostly a performance and appearance effect.
🧬 Electrolytes
Sodium, potassium and magnesium drive muscle contraction directly. Depletion looks exactly like weakness, and people reach for hormones before they check this.
🧬 Sodium Bicarbonate
Extracellular buffering — the complement to beta-alanine's intracellular buffering. Effective and gastrointestinally brutal if you get the dose wrong.
The other 5 routes to build muscle & strength
Pick the pathway that matches where you are actually stuck. An appetite drug does nothing for someone who already undereats.
Want the protocols behind these?
Dosing schedules, stacking, cycle timing and Coach Cam's notes live inside the Academy — plus the full interactive Vault.
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Frequently asked questions
The unglamorous pathway, and the one with the strongest evidence base by an enormous margin. You cannot signal your way past insufficient protein, depleted phosphocreatine or a workout you couldn't finish.
17 options are mapped to this pathway in the Vault, including Creatine, Creatine HCL, Creatine + Alpha-GPC, Whey Protein (RecoveryPro). They are grouped by the mechanism they act through rather than ranked by how much trial evidence exists — 15 carry clinical validation and 2 are mechanistic predictions.
The unglamorous checks that explain most stalled progress. Low ferritin and low B12 both present as 'I just can't train hard any more' with a completely normal full blood count. The markers worth checking are Comprehensive Metabolic Panel (CMP), Complete Blood Count (CBC) with Differential, Ferritin, Vitamin B12.
Unproven is not the same as ineffective. Of the 17 options on this pathway, 15 have clinical validation and 2 are graded theoretical — meaning the mechanism is sound but the specific human trial has not been run, which is true of a great deal of what works in this space. Nothing on this page is ordered by evidence tier, because sorting by trial count would bury the compounds you came looking for.