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Supplement Dosage Comparison by Country — 5 Regional Standards

Compare RDA and tolerable upper intake levels (UL) for the same supplement across 5 countries. Data from FDA, EFSA, TGA, CNS, and MHLW.

Why Do Supplement Dosage Limits Differ by Country?

Different regulatory bodies (FDA, EFSA, TGA, CNS, MHLW) review different scientific evidence and set different RDA and UL values. For example, China sets a vitamin D UL of only 800 IU/day, compared to 4,000 IU in the US and EU — a 5× difference. Japan sets a vitamin E UL of 900 mg, while the US allows up to 1,000 mg.

Tip: Follow the standard from your country of residence. When standards differ significantly, the more conservative (lower) UL is generally safer.

63 ingredients with multi-region data

Notable Differences Across Countries

Vitamin DUL: 800–4000 IU

US (FDA)
4000 IU
RDA: 600 IU
EU (EFSA)
4000 IU
RDA: 600 IU
AU (TGA)
4000 IU
RDA: 600 IU
CN (CNS)
800 IU
RDA: 400 IU
JP (MHLW)
4000 IU
RDA: 600 IU

IodineUL: 1100–3000 mcg

US (FDA)
1100 mcg
RDA: 150 mcg
EU (EFSA)
1100 mcg
RDA: 150 mcg
AU (TGA)
1100 mcg
RDA: 150 mcg
CN (CNS)
1100 mcg
RDA: 150 mcg
JP (MHLW)
3000 mcg
RDA: 130 mcg

Vitamin B1UL: 50–100 mg

US (FDA)
100 mg
RDA: 1.2 mg
EU (EFSA)
100 mg
RDA: 1.2 mg
AU (TGA)
100 mg
RDA: 1.2 mg
CN (CNS)
50 mg
RDA: 1.4 mg

What Are RDA and UL?

RDA (Recommended Dietary Allowance) — The daily intake sufficient to meet the nutrient needs of most healthy people. This is the minimum you should aim for.
UL (Tolerable Upper Intake Level) — The maximum daily intake unlikely to cause adverse health effects. Exceeding the UL is not immediately dangerous, but chronic excess increases health risks.

Is Your Supplement Dosage Safe?

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Not medical advice. Always consult a qualified healthcare professional for personal medical decisions.