Molybdenum vs Potassium (Citrate)

Mechanism

Molybdenum is the essential cofactor for three human enzymes: sulfite oxidase (converts toxic sulfite to sulfate — critical for sulfur amino acid metabolism), xanthine oxidase (purine catabolism to uric acid), and aldehyde oxidase (aldehyde detoxification, drug metabolism). The molybdenum cofactor (Moco) requires molybdopterin as a carrier. Sulfite oxidase is the most clinically significant — sulfite accumulation is neurotoxic. Molybdenum also plays a role in the metabolism of sulfur-containing amino acids and may support phase I/II detoxification pathways.

Standard Dosing

75-250 mcg daily

Timing

With meals. Often included in multimineral formulas.

Cycle Duration

ongoing (via multimineral)

Side Effects

• Generally very well tolerated
• Gout flares at high doses (increased uric acid production)
• Copper depletion at very high doses
• Joint pain (rare)

Contraindications

• Gout (xanthine oxidase is the uric acid-producing enzyme — molybdenum supports this enzyme)
• Copper deficiency

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Mechanism

Potassium is the principal intracellular cation, maintaining resting membrane potential (-70 to -90mV) via the Na+/K+-ATPase pump (3 Na+ out, 2 K+ in per ATP). It is essential for: cardiac rhythmicity (phase 3 repolarization of cardiac action potential), skeletal muscle contraction, nerve impulse transmission, acid-base balance (exchanged for H+ in renal tubules), blood pressure regulation (promotes natriuresis via renal sodium excretion), and insulin secretion. Citrate form provides alkalinizing anion that inhibits calcium oxalate and uric acid kidney stone formation.

Standard Dosing

99-200mg per capsule (regulatory limit in US); dietary target 3500-4700mg/day total

Timing

With meals, divided throughout the day. Slow-release forms preferred for higher doses.

Cycle Duration

ongoing

Side Effects

• GI irritation/ulceration (non-microencapsulated forms)
• Nausea
• Diarrhea
• Hyperkalemia (dangerous — cardiac arrhythmias)

Contraindications

• Hyperkalemia
• Renal insufficiency (impaired K+ excretion)
• Addison's disease (aldosterone deficiency)
• Concurrent ACE inhibitor/ARB + potassium-sparing diuretic

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