Iron Bisglycinate vs Molybdenum

Mechanism

Iron is essential for hemoglobin (oxygen transport), myoglobin (muscle oxygen storage), cytochrome enzymes (electron transport chain — Complexes I, II, III, IV), cytochrome P450 enzymes (drug/hormone metabolism), catalase (H2O2 decomposition), ribonucleotide reductase (DNA synthesis), and aconitase (Krebs cycle). Iron bisglycinate (Ferrochel) uses amino acid chelation to bypass the normal DMT1/ferroportin pathway, instead being absorbed intact via PepT1 transporter. This mechanism avoids the GI side effects of ionic iron (free Fe2+ generates hydroxyl radicals via Fenton reaction in the gut lumen) and is not inhibited by phytates, tannins, or calcium.

Standard Dosing

25-36mg elemental iron (as bisglycinate) daily for deficiency correction

Timing

On empty stomach or with vitamin C for absorption. Alternate day dosing (every other day) may be superior due to hepcidin cycling. Separate from calcium, zinc, tea, coffee by 2+ hours.

Cycle Duration

Until ferritin >50 ng/mL, then reassess (typically 3-6 months). Not for ongoing supplementation unless chronic blood loss.

Side Effects

• GI distress (significantly less than ferrous sulfate)
• Constipation (less common with bisglycinate)
• Dark stools
• Nausea
• Iron overload if supplemented unnecessarily

Contraindications

• Hemochromatosis
• Iron overload conditions
• Thalassemia (without documented deficiency)
• Hemolytic anemias (unless also iron deficient)
• Chronic transfusion therapy

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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

Best Stacking Partners