English version in progress: interface and data are in English; some explanatory text is still in Chinese.

Iron

铁被吸收后装进血红蛋白，红细胞靠它把氧从肺送到全身。

Full ranking Dose tool Products (3,054)

Key facts

Daily Value (US FDA)18 mg

Tolerable Upper Intake Level (UL)45 mg

Median（Per day）5 mgP5 0.43 – P95 30.9

Products3,054

Sources: https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/ · FDA DV 18 mg (https://www.fda.gov/food/nutrition-facts-label/daily-value-nutrition-and-supplement-facts-labels); pre-2016 DV [] (https://www.federalregister.gov/documents/2016/05/27/2016-11867/food-labeling-revision-of-the-nutrition-and-supplement-facts-labels); adult UL 45 mg; hard_high=450 per serving (UL x10 or market maximum), hard_low=DV/1000

How it works：铁怎样变成"运氧"的能力？

1/5食物里有两种铁：肉类中的血红素铁吸收较好；植物和补剂中的非血红素铁吸收较少。维生素 C 能提高非血红素铁的吸收。

食物里有两种铁：肉类中的血红素铁吸收较好；植物和补剂中的非血红素铁吸收较少。维生素 C 能提高非血红素铁的吸收。
铁主要在十二指肠吸收。
吸收后与转铁蛋白结合，随血液运输。
大部分铁用于合成血红蛋白，负责把氧从肺运到组织。
多余的铁以铁蛋白形式储存在肝脏等处。

Schematic only; positions and scale are not anatomical.

Limits and cautions：成人 UL 为 45 mg/天；儿童误服铁剂可致严重中毒，需放在儿童拿不到的地方。

Sources：NIH ODS: Iron Fact Sheet for Health Professionals

Daily dose across products（mg/day）

DV 18 UL 45

0.2 mglog scale · n=3,05484 mg

Label data from official national databases and brand websites, as declared; not lab-verified.

Common forms

Form	Products	Median	P5–P95	Elemental fraction
Iron fumarate	538	10 mg	1.67 – 35	32.9% [source]
Iron bisglycinate	147	18 mg	2.5 – 45	—
Iron gluconate	115	10 mg	1.25 – 35	11.6% [source]
Iron carbonyl	101	18 mg	1.66 – 40	—
Iron sulfate	59	12 mg	1.1 – 65	—
Iron citrate	41	5 mg	1.25 – 25	—

Top ranked

Rank	Brand	Product	Per day	Score
1	XYMOGEN	Iron Glycinate	29 mg	90.0
2	The Vitamin Shoppe	Comfort Iron 25 mg	25 mg	88.0
2	Bayer	Fergon Ferrous Gluconate	27 mg	88.0
2	Nature's Bounty	Gentle Iron	28 mg	88.0
2	The Vitamin Shoppe	Iron 28 mg	28 mg	88.0

Full ranking →

For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.