Iron Bisglycinate

Yes. Iron supplements can reduce absorption of levodopa (Sinemet, Stalevo) for Parkinson's and restless leg syndrome, and of levothyroxine (Synthroid and others) for thyroid conditions; take levothyroxine over 4 hours apart. Proton pump inhibitors like omeprazole (Prilosec) can reduce iron absorption. — per the NIH Office of Dietary Supplements; general information, not medical advice.

Source Naturals, Iron Chelate, 25 MG, 250 Tabs at $0.05 per serving — the lowest cost-per-dose iron bisglycinate in our catalog. See the full ranking on the Best Iron Bisglycinate page.

We're tracking 42 active Iron Bisglycinate deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.

Across 42 tracked Iron Bisglycinate deals the median cost-per-dose is $0.084; the cheapest quartile comes in under $0.063 per serving. Anything below the median is a solid deal for the same molecule.

Deals are submitted by the community and ranked by net votes (hot minus cold) plus cost-per-dose normalised across container sizes. We take no affiliate kickbacks for ordering; sponsored slots, when present, are clearly badged.

The risk of iron overload from dietary sources is low among adults with normal intestinal function, but high doses of iron supplements can cause gastrointestinal effects such as gastric upset, constipation, nausea, vomiting, and diarrhea, and extremely high doses can be severe, including corrosive necrosis of the intestine, multisystem organ failure, and even death. The Tolerable Upper Intake Level for iron is 45 mg for adults, and it ranges from 40 mg to 45 mg for infants, children, and adolescents, depending on age. — per the NIH Office of Dietary Supplements.

Although most people in the United States obtain adequate iron, pregnant women, infants and young children, women with heavy menstrual bleeding, frequent blood donors, and people with conditions such as cancer, gastrointestinal disorders, or heart failure are at risk of inadequate intakes. Iron deficiency anemia, which occurs when iron stores are exhausted and hemoglobin declines, can cause gastrointestinal disturbances, weakness, fatigue, and difficulty concentrating, and may impair cognitive function, immune function, and body temperature regulation; in infants and children it can cause psychomotor and cognitive abnormalities that may be irreversible. — per the NIH Office of Dietary Supplements.

The richest dietary sources of heme iron are lean meat and seafood, while nonheme iron comes from nuts, beans, vegetables, and fortified grain products; in the United States about half of dietary iron comes from bread, cereal, and other grain products because wheat and other flours are often fortified with iron. Heme iron has better bioavailability than nonheme iron, and some plant sources such as spinach have low bioavailability because they contain iron-absorption inhibitors. — per the NIH Office of Dietary Supplements.

Labels often show the iron bisglycinate COMPOUND weight, not elemental iron. By weight, iron carbonyl is about 98% elemental while gluconate is only about 12% — so a "1,000 mg gluconate" product delivers roughly 120 mg of elemental iron. Compare the "Iron Bisglycinate" line in the Supplement Facts panel, not the front-of-bottle number.