Mitochondrial enzymes are not freelance. Every reaction along the electron transport chain requires specific cofactors. When any of them is short, the chain slows. The patient feels it as fatigue, slow recovery, brain fog, or any of the other mitochondrial-pattern symptoms.
Most of these cofactors are nutrients. Some are common to every adult diet. Others are commonly short in modern adults despite intake that looks adequate on paper. The difference is whether your specific biochemistry is using what you eat efficiently, and that is a question the metabolomics panel answers directly.
Here are the nutrients I read most carefully and the food sources that support them.
The high-leverage cofactors
CoQ10 (ubiquinone, ubiquinol). Sits at the heart of the electron transport chain. The body synthesizes it, but production declines with age and is suppressed by statins. Food sources: fatty fish, organ meats, whole grains. I supplement (typically ubiquinol, 100 to 200 mg daily) when a patient is on a statin, when a metabolomics panel shows the signature, or when the case calls for it on a fatigue workup. I do not blanket-prescribe.
B vitamins as a group. Every step of glucose metabolism, fat oxidation, and ATP production requires B vitamins as cofactors. The functional markers I read:
- B12: methylmalonic acid (MMA). Elevated MMA means functional B12 shortfall regardless of serum level.
- Folate: formiminoglutamate (FIGLU). Elevated means functional folate shortfall.
- B6: xanthurenate. Elevated means B6 shortfall.
- B1 (thiamine): alpha-ketoglutarate accumulation suggests insufficiency.
I supplement with methylated forms (methylcobalamin, methylfolate, pyridoxal-5-phosphate) when the panel calls for them. Whole-food sources: leafy greens, eggs, liver, legumes, fish.
Magnesium. Required for over 300 enzymatic reactions including ATP production. Magnesium-bound ATP is the actual energy unit, not naked ATP. Functional magnesium status is commonly low in adults eating typical American diets. Food sources: nuts, seeds, leafy greens, dark chocolate. Supplementation works when the diet is not closing the gap, typically as glycinate or threonate.
Omega-3 fatty acids (EPA, DHA). Embed in mitochondrial membranes and affect both fluidity and signaling. The omega-3 to omega-6 ratio is off in most modern diets. Food sources: fatty fish (salmon, sardines, mackerel) two to three times weekly. Supplementation when food intake is not sufficient.
L-carnitine. Shuttles fatty acids into mitochondria for oxidation. The body synthesizes it from lysine and methionine, but supplementation matters in specific contexts (muscle disorders, certain hereditary conditions, sometimes statin users). Food sources: red meat, dairy.
Alpha-lipoic acid. Cofactor for pyruvate dehydrogenase, which is the gateway from glucose metabolism into the mitochondria. Also regenerates other antioxidants. Food sources: spinach, broccoli, potatoes. Modest amounts.
Iron. Cytochromes in the electron transport chain are iron-dependent. Iron deficiency, even sub-clinical (low ferritin without anemia), produces mitochondrial-pattern fatigue. Food sources: red meat, organ meats, legumes paired with vitamin C. I check ferritin on every patient with fatigue, and I treat below 50 ng/mL even when the CBC is normal.
What food alone does well
Most of these cofactors are well-covered by a diet rich in whole foods, with three or more daily servings of vegetables, two to three servings of fatty fish weekly, eggs or organ meats when tolerated, nuts and seeds, and modest amounts of grass-fed meat. That pattern handles most adults' cofactor needs.
The exceptions are patients with absorption issues (low stomach acid, gut inflammation, surgical changes), patients with genetic variants that increase need (MTHFR is the most common), patients on medications that deplete specific cofactors (statins, metformin, PPIs), and athletes with high turnover.
What I do not prescribe
A few categories of supplements come up in patient questions that I usually do not recommend:
- Generic multivitamins. Most are too low-dose to matter and contain forms (cyanocobalamin, folic acid) that some patients cannot use efficiently.
- Mega-dose antioxidants. The data suggests high-dose isolated antioxidants can blunt the hormetic benefit of exercise.
- Random "energy" supplements. B12 shots without a B12 shortfall do nothing.
I prescribe based on the panel, the case, and the goal. If you want a physician to read your specific cofactor pattern, the path in is the Precision Call.
