Is there an Iron Supplement Which Won't Cause Diarrhea?

One of the truly unpleasant side effects of most iron supplements is the fact they can cause diarrhea and other forms of stomach upset.

But why does this happen and is there anything you can do about it?

The good news is, there is. I'll introduce Nano Iron, a gentle iron supplement designed to reduce or eradicate side effects such as diarrhea, constipation or intestinal dysbacteriosis.

Is there an Iron Supplement Which Does not Cause Diarrhea?

Why Does Iron Supplementation Cause Diarrhea?

Diarrhea can be a common and unpleasant side effect of traditional iron supplements. To understand why this happens, let's take a closer look at some of the science of iron absorption and how it affects the stomach.

When you take an oral iron supplement, the iron enters your digestive system and is absorbed primarily in the duodenum and upper jejunum of the small intestine. This absorption process is regulated by a protein called hepcidin. However, traditional iron supplements tend to release a large amount of iron at once, overwhelming the body's natural regulatory mechanisms. As a result, not all of the iron is absorbed, and the unabsorbed iron continues to travel through the digestive tract.

This surplus iron disrupts the balance of the gut microbiome, which is the community of microorganisms that live in your digestive system.

When the gut microbiome is disrupted, it can lead to a range of symptoms including diarrhea, heartburn, constipation, nausea and so forth.

Additionally, the unabsorbed iron can draw water into the gut, causing loose stools and cramping. In some cases, the free iron can even damage the intestinal lining.

3 Reasons Iron Upsets Your Stomach

Iron upsets your stomach when the amount ingested surpasses what your body can absorb. When the capacity to absorb iron is exceeded, the excess remains in the gastrointestinal tract.

This unabsorbed iron can lead to several issues:

  1. Microbiome Disruption: Excess iron alters the growth patterns of gut bacteria, leading to an imbalance. Some bacteria that thrive on iron can outcompete others, potentially leading to gas, bloating, and altered stool consistency.

  2. Osmotic Effect: Iron that remains in the colon can attract water into the bowel. This osmotic effect results in watery stools as the body attempts to flush out the unabsorbed iron.

  3. Mucosal Irritation: The excess iron can also irritate the lining of the gastrointestinal tract which may contribute to stomach discomfort and exacerbate bowel irritation.

In my experience, these persistent gastrointestinal side effects end up discouraging people from adhering to their iron supplement regimen.

So is there a supplement which does things differently?

What Iron Supplements Don't Upset Your Stomach?

Nano Iron is a new, pure (elemental) form designed to reduce or eradicate unpleasant side effects. 

Because Nano Iron consists of ultra-fine particles (the size of single atoms) of 99.99% pure (elemental - non compound), in a highly purified (demineralised and energised) water, it is not purely reliant on the digestive processes for absorption. The iron particles can be readily absorbed directly through the oral mucosa (soft tissues) meaning less free iron ends up in the gut.

In the broader market, iron bisglycinate, also known as gentle iron, is another option that is reputed to be easier on the digestive system. This form is chelated, meaning the iron is bound to amino acids, making it more absorbable and less likely to cause stomach problems. However, while it is gentler, it is not entirely free from causing side effects. 

Liquid iron supplements are also considered to be gentler on the stomach, as they can be more readily absorbed.

Time-release iron supplements release iron slowly, which can lessen gastrointestinal distress compared to those that release iron immediately upon ingestion.

Nano Iron: an Easily Tolerated Iron Supplement 

Nano Iron is a cutting-edge iron supplement has been specifically designed to be as absorbable as it can be, providing a more comfortable and effective way to achieve well balanced iron levels.

The key to Nano Iron's lack of side effects in bowel discomfort lies in its enhanced absorption. The minuscule size of the iron nanoparticles allows for a greater surface area, leading to improved absorption, which can occur through any soft tissues (including in the mouth). This increased absorption means that less unabsorbed iron reaches the colon, reducing the likelihood of disrupting the gut microbiome and irritating the gastrointestinal lining. 

Conclusion: The Best Iron Supplement for a Sensitive Stomach

Ask your doctor, GP or qualified health professional if Nano Iron would be worth trying.

It is tasteless and odourless and is suitable for the whole family.


Why do iron tablets upset my stomach? Iron tablets commonly upset the stomach due to the irritation they can cause to the stomach lining and their potential to disrupt the gut microbiome. This can result in side effects like nausea, and cramps. Nano Iron's smaller particle size and higher absorption rate may help avoid such irritations.

Which iron is gentlest on the stomach? While iron bisglycinate is considered gentle, Nano Iron is often preferred which may be due to its purity (lack of compound) and other qualities that make it easy to absorb. 

How should you take iron supplements to avoid gastric upset? Taking compound iron supplements with food can mitigate gastric upset. Nano Iron, due to its purity and high absorbency does not impact in the same way and thus can be taken away from food, making it a convenient option. Regardless of the supplement type, it is always advisable to follow the dosing recommendations of a healthcare provider.

What happens if you can't tolerate iron supplements? If traditional iron supplements cause intolerable side effects you should seek the guidance of a qualified health professional who can help determine your best options. This is especially important if you have a health condition. They can also help you decide if Nano Iron is an alternative due to its innovative form.