Supplement ingredient databaseChecked 2026-09-30

Iron 鉄

Nutrient Function Claims ingredientEU-authorised claim

A mineral.

See example products PR

Minerals

In Japan: Foods with Nutrient Function Claims and the Dietary Reference Intakes

Wording allowed (current): “Iron is a nutrient necessary for making red blood cells.”
Amount per daily serving: 2.04-10 mg (within this range, the wording above may be used without notification)
Proposed revision: “Iron is a nutrient necessary for making red blood cells.”
Amount: 1.95-10 mg
Referred to the Consumer Commission on July 17, 2026. The proposal includes a transition period allowing the current wording until March 31, 2030.
Dietary Reference Intakes (2025, ages 30–49): Recommended dietary allowance: men 7.5 mg, women (non-menstruating) 6.0 mg, women (menstruating) 10.5 mg / tolerable upper intake level: not set (2025 edition)

In the EU: the register of health claims

EU-authorised claimIn the register: 8 authorised, 3 not authorised

Claims such as red blood cell and hemoglobin formation, oxygen transport, and reduction of tiredness are authorised.

In the EU, only health claims whose evidence has been assessed by the European Food Safety Authority (EFSA) and authorised by the European Commission may be used on food. “Not authorised” means the evidence for that claim was not established under EU standards — not that the ingredient is dangerous.

What the US NIH says

In people who are iron deficient or pregnant, it improves hemoglobin.
Taking a lot causes nausea, constipation, and stomach pain. Accidental ingestion by children can be life-threatening. It reduces the absorption of thyroid hormone medication (levothyroxine), the Parkinson's disease drug levodopa, and some antibiotics.

Sources: MHLW eJIM "Iron"

Find products PR

These are Japanese online shops (affiliate links).

Example of a product labeled as a Food with Nutrient Function Claims

Chosen from products on Rakuten with “栄養機能食品” in the name, picking one with many reviews. Check the amount per daily serving on the package.

See on Rakuten (aequalis)See on Amazon.co.jp

This database does not guarantee any product's effect. For Foods with Function Claims, check the notification number on the package; for Foods with Nutrient Function Claims, check the amount per daily serving.

Compare “鉄サプリ栄養機能食品” products on Rakuten Compare “鉄サプリ栄養機能食品” products on Amazon.co.jp

This page lists information published by governments and public bodies. It does not guarantee any effect or judge whether something is good or bad. If you are being treated for an illness, taking medicine, pregnant or breastfeeding, talk to a doctor or pharmacist before use.

Other ingredients in the same categories

This page is a translation of our Japanese page; if they differ, the Japanese page is the reference.

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