Oxygen carrying, blood sugar & the boring causes
One of 4 mechanistic pathways to 🔋 Energy & fatigue · 13 options
Before anything exotic, rule these out. Low ferritin, B12 deficiency and blood-sugar swings account for an enormous share of chronic fatigue, and all three are cheap to test and cheap to fix.
Start here. This list explains the large majority of unexplained fatigue, costs very little, and people skip it to buy peptides. Ferritin under 30 and functional B12 deficiency both hide behind a normal full blood count.
Complete Blood Count (CBC) with DifferentialFerritinIron Panel (Iron, TIBC, Transferrin Saturation)Vitamin B12Methylmalonic Acid (MMA)Folate, SerumVitamin D (25-Hydroxy)HbA1c (Hemoglobin A1c)TSH (Thyroid-Stimulating Hormone)🔋 Chronic Fatigue Workup 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.
🧬 Iron
Low ferritin causes fatigue well before it causes anaemia — the full blood count looks normal and the person feels terrible. Under 30 is deficient; under 50 is symptomatic for many. Never supplement without testing, because iron overload is genuinely dangerous.
🧬 Iron Complex
Iron with the B12, folate and vitamin C that erythropoiesis actually requires.
🧬 Methylcobalamin (B12)
B12 deficiency causes fatigue, neuropathy and cognitive change. Serum B12 is an insensitive marker — methylmalonic acid catches what it misses.
🧬 Methylfolate (5-MTHF)
Folate deficiency causes the same macrocytic picture; supplementing folate alone can mask B12 deficiency while the neurological damage continues.
🧬 B-Complex
The whole set works together, and correcting one B vitamin in isolation can unmask a shortage of another.
🧬 Vitamin D
Deficiency is strongly associated with fatigue and is extremely common at higher latitudes.
🧬 Berberine
Post-meal glucose crashes produce a distinctive afternoon fatigue that is easy to mistake for something more complicated.
🧬 Myo-Inositol
Insulin sensitivity, particularly where PCOS is part of the picture.
🧬 Chromium
Insulin signalling cofactor; helps mainly where intake is low.
🧬 Magnesium
Involved in both glucose handling and ATP utilisation.
🧬 Electrolytes
Dehydration and sodium depletion produce fatigue that no supplement fixes, and low-carbohydrate diets make it worse by increasing sodium excretion.
🧬 Desiccated Beef Liver
Whole-food source of heme iron, B12, folate and retinol together — the combination most commonly short in genuine deficiency fatigue.
💉 B12
Injectable B12 bypasses absorption entirely — the right answer in pernicious anaemia, after gastric surgery, or with metformin-induced malabsorption.
The other 3 routes to energy & fatigue
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
Before anything exotic, rule these out. Low ferritin, B12 deficiency and blood-sugar swings account for an enormous share of chronic fatigue, and all three are cheap to test and cheap to fix.
13 options are mapped to this pathway in the Vault, including Iron, Iron Complex, Methylcobalamin (B12), Methylfolate (5-MTHF). They are grouped by the mechanism they act through rather than ranked by how much trial evidence exists — 11 carry clinical validation and 0 are mechanistic predictions.
Start here. This list explains the large majority of unexplained fatigue, costs very little, and people skip it to buy peptides. Ferritin under 30 and functional B12 deficiency both hide behind a normal full blood count. The markers worth checking are Complete Blood Count (CBC) with Differential, Ferritin, Iron Panel (Iron, TIBC, Transferrin Saturation), Vitamin B12.
Unproven is not the same as ineffective. Of the 13 options on this pathway, 11 have clinical validation and 0 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.