Nano Iron: What It Is, How It Works, and Why the Format Matters
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Iron is one of the most important minerals in the human body. It plays a central role in the production of haemoglobin — the protein in red blood cells that carries oxygen from the lungs to every cell in the body — and is essential for normal energy metabolism. Despite this, iron is one of the most commonly insufficient minerals in UK diets, particularly among women of reproductive age, vegetarians, and those with higher physical demands.
For those who supplement their iron intake, the format of the supplement matters considerably. Not all iron supplements work in the same way, and understanding the differences helps you make a better-informed choice. This post explains what nano iron is, how it differs from standard iron supplement formats, and what the science behind it actually means in practice.
The Problem with Standard Iron Supplements
Standard oral iron supplements — tablets, capsules, and most liquids — contain iron in compound form. Common examples include ferrous sulphate, ferrous fumarate, and ferrous gluconate. These are widely available and have been used for decades, but they come with a well-known practical problem: gastrointestinal side effects.
When you read the label of a compound iron supplement, you will typically see two numbers. The larger number is the total weight of the chemical compound. The smaller number — the one that actually matters — is the elemental iron: the amount of iron the body can potentially absorb. The elemental iron must first be liberated from the compound within the gastrointestinal tract before the body can use it. This liberation process occurs throughout the digestive system, primarily in the upper gut including the stomach.
In healthy individuals, absorption from compound iron supplements is typically 10–15%. In those with iron-deficiency anaemia, the body can upregulate absorption to as much as 50%. In people with malabsorption conditions, it can be considerably lower.
The iron that is not absorbed does not simply disappear — it passes into the lower gut, where it can disturb the balance of gut bacteria. This is the primary reason compound iron supplements are associated with side effects including stomach cramps, nausea, dizziness, constipation, dark stools, disturbed intestinal flora, and a metallic taste in the mouth. The higher the dose required, the more pronounced these effects tend to be. Ferrous iron also produces free radicals in the intestines, which can impact gut microflora and promote the growth of harmful bacteria at the expense of beneficial ones.
It is also worth noting that many compound iron supplements — including tablets, capsules, powders, and liquids — contain fillers, residues, additives, excipients, and adulterants in addition to the iron compound itself.
How Small Is "Nano"?
The prefix "nano" means one-billionth. One nanometre is one-billionth of a metre. To put that in context: a sheet of paper is approximately 100,000 nanometres thick. A single human hair is 80,000–100,000 nanometres wide. A strand of human DNA is 2.5 nanometres in diameter.
Nano Iron contains iron particles measuring between 0.5 and 7 nanometres. To illustrate just how small that is: if a nanoparticle were the size of a kiwi fruit, the kiwi would be the size of the world. These particles are also small enough to pass through the blood brain barrier — the membrane that protects the central nervous system and restricts passage to particles below approximately 10 nanometres.
What Is Nano Iron?
Nano Iron is elemental iron — iron in its pure, uncombined form, not bonded to any salt, compound, or carrier. It consists of perfectly spherical iron particles between 0.5 and 7 nanometres suspended in ultra-purified, energised water. That is the complete ingredient list: iron (elementary) and purified water. No fillers, no additives, no preservatives, no allergens. Tasteless and odourless.
Because it is 100% elemental iron and not a compound, Nano Iron does not need to be liberated from anything in the digestive tract. There is no chemical compound to break down, no conversion process required in the stomach, and no unabsorbed iron passing into the lower gut.
How Nano Iron Is Actually Absorbed
This is the most important distinction — and the one most often missing from descriptions of nano iron.
Nano Iron is not absorbed through the gut in the way conventional iron supplements are. It is absorbed through the oral mucosa — the mucous membrane lining of the mouth, including the soft tissue of the gums, cheeks, and lips. When the liquid is held in the mouth and swished gently, the nanoparticles penetrate the soft tissue directly and enter the bloodstream, bypassing the digestive tract entirely.
This is why how you take it matters. No food or drink should be consumed for at least 30 minutes before or after taking Nano Iron — food and drink occupy the soft tissue surfaces of the mouth through which absorption occurs. Holding the liquid in the mouth with a gentle swishing movement for a minimum of 30 seconds before swallowing maximises contact with the oral mucosa.
Because the particles are under 10 nanometres in size, they are also small enough to pass through the blood brain barrier — the membrane that restricts access to the central nervous system based on particle size.
Understanding the Iron Content: The Two Numbers Explained
Nano Iron's label states: 30 ml Nano Iron is equal to 14 mg iron bisglycinate (100% RI).
This needs a little unpacking, because it uses a reference compound for comparison rather than stating the physical iron content of the liquid directly.
Each 30 ml of Nano Iron contains approximately 0.75–0.9 mg of elemental iron. Because Nano Iron is absorbed as whole nanoparticles through the oral mucosa — rather than being partially absorbed from a compound in the gut — the iron bisglycinate equivalence figure is used to express the effective dose in terms of a familiar reference standard. Iron bisglycinate is one of the better-absorbed compound iron formats, and is the standard used to calculate Reference Intake (RI) percentages.
In other words: a much smaller physical quantity of elemental nano iron provides an equivalent effective dose to 14 mg of iron bisglycinate, because the nano iron does not need to be partially lost to the gut liberation process.
This is also why translating a healthcare professional's recommendation requires a different calculation than you might expect:
- If recommended 15 mg of a regular iron supplement: approximately 30–35 ml of Nano Iron on an empty stomach.
- If recommended 20–30 mg of a regular iron supplement: approximately 30–35 ml of Nano Iron twice a day on an empty stomach.
Always follow the specific guidance of your healthcare professional.
The Miron Violet Glass
Nano Iron is bottled in dark violet Miron glass — which may appear black but is a unique deep violet. This is biophotonic glass: it blocks the visible light spectrum that causes oxidation and molecular degradation, while allowing infrared and UV-A light to pass through. This protects the suspension from light damage without the need for any preservatives.
When the bottle is empty, it is worth keeping. The same properties that protect nano iron make it useful for storing filtered water, seeds, oils, or anything else where preserving nutritional quality matters.
Nano Iron in Practical Terms
Tasteless. Odourless. Two ingredients. No gut burden. Suitable for the whole family from infancy. Can be taken during pregnancy and breastfeeding. Available in 500 ml and 1000 ml bottles — the 1000 ml offers better value for regular use or households where more than one person is taking it.
References
- Oral iron supplementation: new formulations, old questions — haematologica.org
- The Effects of Nanoparticles Containing Iron — pmc.ncbi.nlm.nih.gov
- Nanoparticulate iron(III) oxo-hydroxide delivers safe iron — pmc.ncbi.nlm.nih.gov
- A metal-polyphenol network-based iron supplement — sciencedirect.com
Further Reading
For practical guidance on dosing, timing, and method, our complete guide to using nano iron covers everything. For a direct comparison between nano iron and ferric iron (Fe3+) formats, our nano iron vs Fe3+ post explains the structural differences. Both are part of our natural supplements range.
