Mineral guide

Iron

Iron supplements can look similar on the shelf while differing substantially in iron form, daily amount, added vitamin C and instructions around food. This guide focuses on the details that actually change how a consumer uses and compares them.

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In this guideIngredient basics, choosing & product comparison

What is iron?

Iron is an essential mineral needed for haemoglobin and normal oxygen transport. Dietary iron occurs in two main forms: haem iron, found in meat and other animal foods, and non-haem iron, found mainly in plant foods. Non-haem iron is more affected by other foods and drinks eaten at the same time. Supplements use compounds such as ferrous fumarate, ferrous sulfate and iron bisglycinate.

What does iron support?

Iron contributes to normal formation of red blood cells and haemoglobin, normal oxygen transport, normal energy-yielding metabolism, normal immune-system function and reduction of tiredness and fatigue. It also contributes to normal cognitive function and has a role in the process of cell division.

What happens if you don’t get enough iron?

Iron deficiency develops in stages. The body can first draw on stored iron; if stores become depleted far enough, iron-deficiency anaemia can develop and haemoglobin falls. Symptoms of iron-deficiency anaemia can include tiredness, weakness, shortness of breath, palpitations and difficulty concentrating. These symptoms are not specific to iron deficiency, so they should not be used to diagnose it on their own.

Iron deficiency is not the same as iron-deficiency anaemia

Low iron stores can exist before anaemia develops. Blood tests are used to assess iron status and anaemia, and the underlying cause matters — for example, blood loss, pregnancy, low intake or impaired absorption may require different evaluation. This is one reason high-dose iron is not a routine “just in case” supplement.

Iron and hair loss

Hair loss is a common reason people search for iron and ferritin information. A systematic review of women with nonscarring alopecia found lower ferritin levels than in women without hair loss. This supports iron status as relevant context, but it does not mean that taking extra iron improves hair in someone who is already iron-replete.

Iron absorption: what you take it with matters

Non-haem iron is especially affected by what you eat and drink at the same time. Some meal components can increase absorption, while others can reduce it.

Several meal components can affect how well non-haem iron is absorbed.

Can increase absorption

Vitamin C

Vitamin C increases iron absorption.

Meat, fish and poultry

Eating them with a meal can improve the absorption of non-haem iron.

Can reduce absorption

Tea and coffee

Polyphenols in tea and coffee can reduce non-haem iron absorption.

Phytates

Phytates in foods such as grains and legumes can reduce non-haem iron absorption.

Calcium

Calcium can reduce iron absorption in a meal, although the long-term effect on iron status is less clear.

Taking iron with other mineral supplements Large supplemental doses of minerals can interact with one another. Calcium can interfere with iron absorption, and high-dose iron can reduce zinc absorption. Evidence for magnesium is less clear and depends partly on the magnesium compound, so a universal rule to separate all mineral supplements is not justified. If you use separate high-dose mineral supplements, check the product instructions or healthcare guidance for timing.

Does iron form change the comparison?

Yes. Conventional ferrous salts, iron bisglycinate, ferric compounds and newer delivery systems should not be treated as interchangeable simply because the front label shows the same milligram amount. The meaningful comparison is the declared elemental iron, the formulation, label directions and tolerability context.

Common comparison categories

Iron bisglycinateWidely used in products marketed as “gentle iron”. Check elemental iron and the actual label rather than relying on the marketing name.

Ferrous saltsTraditional oral iron forms with substantial clinical use. Food can reduce absorption, while taking iron without food may increase gastrointestinal discomfort for some people.

Ferric formulationsProducts may use ferric pyrophosphate, ferric sodium EDTA or other ferric compounds; delivery system matters.

Alternative deliveryOral sprays and encapsulated technologies may have manufacturer-specific directions that differ from conventional tablets.

Compare iron forms and daily amounts →

Formulation spotlight

Sucrosomial® iron and SiderAL® Forte

SiderAL Forte is classified by its manufacturer as a food supplement and supplies 30 mg iron as Sucrosomial® Iron plus 70 mgvitamin C per capsule. The manufacturer directs one capsule daily and states it can be taken at any time of day.

Sucrosomial® Iron uses ferric pyrophosphate in a protected delivery matrix. Published literature and manufacturer material discuss gastrointestinal tolerability and absorption as advantages of the technology. IngredientScope treats those as formulation-specific evidence rather than assuming every product using a different iron form is inferior.

If conventional iron causes stomach discomfort, compare alternative formulations, including sucrosomial iron and iron bisglycinate, and check their use instructions.

Comparing low, standard and higher-strength iron

Iron supplements span a wide range of strengths. With an EU NRV of 14 mg, a 10 mg product is below the NRV, 15 mg is close to it, while 25–30 mg products are clearly higher-strength. This makes the labelled iron per recommended day more useful than judging a product by capsule count or front-of-pack wording.

Strength should match the reason for using the product

EFSA has set a safe level of total iron intake of 40 mg/day for adults rather than a tolerable upper intake level. That figure is not a supplement target. When iron status is a concern, the reason for low iron and any healthcare advice matter more than simply moving to the strongest product available.

What should you compare?

Iron per daily serving

Strengths vary widely, so compare the full labelled daily amount rather than capsule count.

Iron form

Bisglycinate, conventional salts, ferric compounds and specialised delivery technologies belong in the table.

Vitamin C

Show the amount when included. It increases iron absorption.

Food directions

IngredientScope reports what the manufacturer actually says: with food, preferably with food, any time of day, or no food required.

Product comparison

Compare iron supplements

Compare iron per day, iron per unit, serving, iron form, vitamin C, food directions, format and vegan suitability.

Iron milligrams are only the start. Compare elemental iron, form, vitamin C and the labelled directions for use. The EU Nutrient Reference Value (NRV) for iron is 14 mg for adult labelling; it is a labelling reference, not a personal dose recommendation. EFSA set an adult safe level of total iron intake at 40 mg/day because available data were insufficient to establish a Tolerable Upper Intake Level (UL); the safe level is not a target dose.

Default order: labelled iron per recommended daily serving, lowest to highest. The order is not a ranking, and higher-dose products are not presented as better.

Product	Iron / day	Iron / unit	Recommended serving	Iron form	Vitamin C	Absorption & food	Format	Vegan
BetterYou Iron 10 Oral SprayView product ↗	10 mg	2.5 mg	4 sprays daily	Ferric sodium EDTA + ferric ammonium citrate	—	With or without food · manufacturer says any time of day	Oral spray	Yes
Viridian Balanced Iron ComplexView product ↗	15 mg	15 mg	1 capsule daily	Iron bisglycinate	100 mg vitamin C	Take with food	Plant capsule	Yes
NOW Foods Iron 18 mgView product ↗	18 mg	18 mg	1 capsule daily with a meal	Ferrous bisglycinate (Ferrochel™)	—	Take with a meal	Veg capsule	Yes
Solgar Gentle IronView product ↗	25 mg	25 mg	1 vegetable capsule daily, preferably with a meal	Iron bisglycinate chelate	—	Take preferably with a meal	Vegetable capsule	Yes
SiderAL ForteView product ↗	30 mg	30 mg	1 capsule daily	Sucrosomial® Iron (ferric pyrophosphate delivery system)	70 mg vitamin C	Manufacturer says any time of day · formulation-specific directions	Capsule	Yes

Absorption note: Tea, coffee, calcium-rich foods or supplements and phytate-rich meals can reduce absorption of conventional non-haem iron. Vitamin C increases iron absorption. The practical instruction still depends on the formulation, so this table reports product-specific directions rather than applying the same separation rule to every iron product.

EU health claim details

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Authorised health claims

A quick consumer view — full regulatory list available below

● Iron contributes to the reduction of tiredness and fatigue.Tiredness & fatigue · General population