Iron

Iron is an essential trace mineral required for the synthesis of hemoglobin, the protein in red blood cells responsible for transporting oxygen throughout the body. It also serves as a critical component of myoglobin, which supports muscle metabolism and healthy connective tissue, and is a vital cofactor for enzymes involved in energy production, DNA synthesis, and neurological development.

Iron facilitates the delivery of oxygen to cells, where it is used by mitochondria in the electron transport chain to produce ATP (cellular energy). The body's iron levels are primarily regulated by the liver-derived hormone hepcidin. When iron is ingested, hepcidin levels rise and temporarily block further absorption for 24 to 48 hours to prevent toxicity. This physiological mechanism is the basis for modern alternate-day dosing strategies which aim to maximize fractional iron absorption.

Based on 2024-2025 research and clinical guidelines:

1. Baseline Testing: Before supplementing, obtain a full iron panel including serum ferritin and transferrin saturation. Optimal ferritin levels for longevity and metabolic health are generally considered to be 50–100 ng/mL, while levels above 200 ng/mL may increase oxidative stress.
2. Alternate-Day Dosing: In cases of deficiency, taking 60–120 mg of elemental iron every other day (e.g., MWF) has been shown to be as effective as daily dosing with significantly fewer gastrointestinal side effects.
3. Synergistic Intake: Take iron with 500 mg of Vitamin C or a glass of orange juice to enhance absorption.
4. Avoid Inhibitors: Do not consume iron within 2 hours of calcium supplements, coffee, tea, eggs, or whole grains, as these significantly inhibit uptake.
5. Morning Timing: Take supplements in the morning when hepcidin levels are naturally lower for better bioavailability.