A shortage of iron in the body is a more serious and widespread problem than many people realize. In fact, iron deficiency anemia is the most common nutritional deficiency in the world and a major cause of reduced work capacity in adults and impaired mental function in children and adolescents.1

Although this problem is more pervasive in parts of the world other than the United States, there are segments of the U.S. population particularly susceptible to iron deficiency.

These segments include teenage girls, pregnant women, women of childbearing age (particularly if they have heavy menses), individuals with malabsorption syndromes (Crohn's disease or Celiac disease), individuals on chemotherapy, elderly patients with low stomach acid secretion, and individuals with poor kidney function.

Although the only sure way to know if you are iron deficient is to have a blood test, tell-tale symptoms of iron deficiency include weakness, fatigue, shortness of breath on exertion, dizziness, tinnitus, spots before the eyes, drowsiness, irritability, infrequent menses, and loss of libido.

What is the connection between iron and health?

Essentially it comes down to blood building, which is a more demanding job than you might realize. Believe it or not, a healthy body (specifically the body’s bone marrow) produces 2-3 million red blood cells every second.2 As you might realize, that process requires an ample supply of hematinic (blood building) nutrients, and iron is a key hematinic nutrient.*

However, many iron supplements are made with ferrous sulfate, which is poorly absorbed and often causes significant GI side effects, such as constipation, bloating, and nausea.

The iron in Thorne’s Ferrasorb® is iron bisglycinate, an iron form that is bound to the amino acid glycine, and is absorbed twice as efficiently as ferrous sulfate.*3

And subjects in a randomized, crossover study of the tolerability of iron bisglycinate versus ferrous sulfate found the iron bisglycinate used in Ferrasorb was less likely to cause GI upset.4

As important as iron is, however, it’s not the only key nutrient for blood building. Studies indicate that combining iron with several B vitamins and vitamin C is superior to using these nutrients individually.

Ferrasorb combines the active forms of vitamin B6 (pyridoxal 5'-phosphate), vitamin B12 (methylcobalamin), and folate (L-5-methyltetrahydrofolate) – with the well-absorbed iron bisglycinate – for an optimal blood-building supplement.* Vitamin C is added to enhance iron's absorption.*

Ferrasorb contains the nutrients most commonly lacking in anemic individuals and provides them in forms that are well-absorbed and biologically active.*

If you need extra iron, then get the iron supplement with optimal absorption and tolerability.*


  1. Killip S, Bennett J, Chambers M. Iron deficiency anemia. Am Fam Physician 2007;75(5):671-678.
  2. Dean L. National Center for Biotechnology Information 2005. http://www.ncbi.nlm.nih.gov/books/NBK2263/ [Accessed July 25, 2018]
  3. Layrisse M, García-Casal M, Solano L, et al. Iron bioavailability in humans from breakfasts enriched with iron bis-glycine chelate, phytates and polyphenols. J Nutr 2000;130(9):2195-2199.
  4. Coplin M, Schuette S, Leichtmann G, Lashner B. Tolerability of iron: a comparison of bis-glycino iron II and ferrous sulfate. Clin Ther 1991;13:606-612.