In brief, the August 1 article established the clinical case for ferritin and hair loss. This article covers what to do about it through food, which iron sources have the highest absorption rates, what significantly reduces that absorption without most people realizing it, and the honest finding from a 2020 JAMA Network Open RCT on whether vitamin C with iron actually makes a meaningful difference. The gap between eating iron-rich foods and actually raising ferritin is the absorption story. Iron comes in two dietary forms with dramatically different absorption rates. Understanding this distinction is the most important practical fact in dietary iron management. Heme iron is found in animal products, meat, fish, poultry. Heme iron from animal sources is absorbed at roughly 15 to 35% efficiency. The body absorbs it through a dedicated transport mechanism that is relatively unaffected by other dietary components. It absorbs well regardless of what else is on the plate. Non-heme iron is found in plant foods and fortified products. Non-heme iron absorption is generally lower than heme iron, with absorption rates as low as 2%. The wide range, 2 to 20%, is because non-heme iron absorption is highly variable and significantly affected by other foods consumed in the same meal. This is where dietary strategy matters most. Which foods have the highest iron content for raising ferritin? Food iron content, a prox. Notes, liver, beef or chicken, beef liver, tilde 6.5 memg per 100g, highest heme. Iron per gram of any food, also rich in B12 folate, vitamin A. Weekly consumption, 100 to 150 G, is the highest dietary impact single food for ferritin. Note, limit to 12x weekly in pregnancy due to vitamin A content. Red meat, beef lamb, tilde 2.5-3.5, mg per 100 G. Heme iron, 15 to 35% absorbed lean beef is the most practical regular source. 3.4 servings per week provides meaningful heme iron without excess saturated fat. Also contains the meat factor that enhances non-heme absorption from other foods in the same meal, oysters and mussels. Oysters, tilde 712 mg per 100 G, exceptionally high heme iron. The highest iron content per gram of any commonly eaten food, often overlooked as an iron source, also rich in zinc, relevant to hair health independently. Lentils tilde 3.3 mg per 100g cooked, non-heme. 2-20% absorb the highest yield plant iron source. Soaking before cooking reduces phytates by tilde 50%, significantly improving absorption. Pair with vitamin C foods and not tea coffee. Tofu, firm, tilde 2.7 mg per 100 G. Non-heme good plant source. Pair with tomato-based sauces or citrus dressing to maximize absorption. Soy itself can mildly inhibit non-heme iron absorption. The vitamin C pairing compensates. Dark leafy greens, spinach, kale, spinach, tilde 2.7, mg per 100 G raw, non-heme. But oxalates reduce absorption. Spinach is often cited as iron-rich, but absorption is poor due to oxalates. Lightly cooking reduces oxalates. Pair with lemon juice, kale has lower oxalates than spinach, better absorption p. Rophile, pumpkin seeds tilde 8 mg per 100 G, non-heme, but high phytate content, high nominal iron content, but significant phytate inhibition. Roasting reduces phytates, useful as a regular dietary addition alongside other sources, not a primary iron intervention on its own. Dark chocolate, 70% plus, tilde, 11 mg per 100 G. Non-heme genuinely meaningful iron content. Do not eat alongside iron-rich meals though. Polyphenols and chocolate reduce non-heme iron absorption. As a standalone snack, a meaningful contribution. What blocks iron absorption, and by how much? This is where most dietary iron strategies fail. The foods being eaten may be iron-rich, but if the absorption inhibitors are not managed, the iron passes through largely unabsorbed, tea and coffee, the most significant everyday blocker. The polyphenols, also known as tannins, in tea and coffee can reduce non-heme iron absorption by up to 70%. You must avoid drinking them for at least one hour before and after an iron-rich meal or supplement. This applies to both caffeinated and herbal teas, it is the tannins, not the caffeine, that inhibit iron. Green tea, black tea, ruibose, and many herbal blends all contain enough tannins to significantly reduce absorption. The practical rule? Separate tea and coffee from iron-rich meals and iron supplements by a minimum of one hour. Calcium, the timing issue? Calcium competes with iron for the same intestinal transport proteins, a glass of milk or calcium supplement taken with an iron rye. Each meal can measurably reduce iron absorption. The practical implication, do not take iron supplements alongside calcium supplements or dairy heavy meals, space them by at least two hours. This does not mean avoiding dairy entirely, it means timing matters. Dairy at breakfast when you are not taking iron supplements is fine. Dairy alongside your lunchtime iron supplement is not. Phtates in raw legumes and whole grains, fitic acid in raw legumes, whole grains, and seeds binds to iron and reduces its absorption. Soaking beans and legumes in water before cooking can reduce the phytates and polyphenols that may block non-heme iron absorption. Soaking lentils for eight hours before cooking reduces phytates by approximately 50%. Sprouting reduces them further. For whole grains, fermentation, as in sourdough bread, significantly reduces phytate content compared to standard whole grain products. These are not dramatic interventions, but consistently soaking legumes before cooking makes a meaningful difference to iron yield over time. Antacids and proton pump inhibitors. Stomach acid is required for iron absorption. It converts ferric iron, F3, to the more absorbable ferrous form, F2. Antacids and PPIs that reduce stomach acid also reduce iron absorption. This is clinically significant for people taking PPIs regularly. It explains why ferritin can be difficult to raise despite adequate dietary intake. If you are on a PPI and have low ferritin, discuss this interaction with