Folic acid daily requirement: 200, 300 or 400 µg?

The short answer: all three figures are right, because they mean different things. The 200 µg on the label are an arithmetic figure for the percentage, not a recommendation. The 300 µg of folate equivalents given by the German Nutrition Society (DGE) are the reference value for the daily intake of adolescents from the age of 13 and of adults. The 400 µg do not apply generally, but to women planning a pregnancy — in addition to the diet. Anyone who reads the three figures as competing recommendations is looking for a contradiction that does not exist.

In front of the shelf it shows up like this: one pack says "400 µg — 200 % NRV", the other "1,000 µg — 500 %". Both percentages refer to the same value of 200 µg, and neither says anything about whether the amount fits your own situation. That is what the other figures are for.

200 µg: the nutrient reference value on the label

The value comes from Annex XIII of Regulation (EU) No 1169/2011 on the provision of food information to consumers. It lays down a nutrient reference value (NRV) for "folic acid" of 200 µg per day. Its only job is to make the percentage on the pack calculable: 400 µg are 200 % NRV, 1,000 µg are 500 %.

Two properties make it unsuitable as a measure of requirement. First, it applies uniformly to all adults — it does not distinguish by age, sex or stage of life. Second, it is a labelling figure and is not continuously adjusted to new reference values. It is a yardstick for comparisons between packs, not for comparison with your own requirement.

300 µg of folate equivalents: the DGE reference value

The D-A-CH reference values, published jointly by DGE, ÖGE and SGE, name 300 µg of folate equivalents per day for adolescents from the age of 13 and for adults of every age. For pregnant women it is 550, for breastfeeding women 450 µg.

The addition "folate equivalents" is not technical jargon but the reason why label and nutrient table cannot be offset against each other directly: folic acid from a preparation is absorbed better than folate from food and therefore counts with a factor of 1.7. So 400 µg of folic acid correspond to around 680 µg of folate equivalents. How this conversion works in detail, and which compounds are authorised in the EU at all, is set out in folic acid or folate: where the difference lies.

The European Food Safety Authority (EFSA) arrives at a somewhat different value: 330 µg of folate equivalents per day for everyone from the age of 15, 600 µg for pregnant women and 500 µg for breastfeeding women. The difference is not a disagreement about the requirement but a consequence of two bodies using different derivation procedures. In practice both values lie so close together that they lead to the same answer.

The values side by side

Age group	D-A-CH (µg folate equivalents/day)	EFSA (µg folate equivalents/day)	Upper level UL (µg/day)
4 to under 7 years	140	140	300
7 to under 10 years	180	200 (7–10 yrs)	400
10 to under 13 years	240	270 (11–14 yrs)	600
13 to under 15 years	300	270 (11–14 yrs)	600
15 to under 19 years	300	330	800
Adults	300	330	1,000
Pregnant women	550	600	1,000
Breastfeeding women	450	500	1,000

Reference values after DGE (D-A-CH 2018) and EFSA (2014), upper levels after EFSA (2023), compiled in the BfR opinion 009/2024. The upper level applies exclusively to the additional intake from preparations and fortified foods — folate from ordinary foods is not counted towards it.

What the diet actually contributes

This is where it becomes interesting, because two sets of data appear to contradict each other.

The German National Nutrition Survey II found for men from the age of 18 a mean intake (median) of 182 to 214 µg of folate equivalents per day depending on age, and 153 to 193 µg for women. Even in the upper range, the 95th percentile, the values lay at 331 to 387 µg (men) and 293 to 320 µg (women). The median therefore lies below the reference value of 300 µg in all age groups.

The blood values paint a different picture. In the German Health Interview and Examination Survey for Adults (DEGS1, 2008–2011), serum folate and red blood cell folate were measured representatively for the first time — biomarkers that reflect supply status more reliably than a dietary record. From this it can be derived that around 86 % of adults are adequately supplied with folate.

How do the two fit together? The BfR names the most likely reason: in the nutrition survey, fortified foods, table salt fortified with folic acid and food supplements were not recorded, or not recorded in full. Actual intake is therefore higher than the calculated figure. Among the foods fortified in Germany are soft drinks and juices (30–245 µg/100 ml), breakfast cereals (170–340 µg/100 g) and table salt.

In practice this means: a calculated value below 300 µg is not yet a deficiency, and a figure from a nutrient table does not replace a laboratory value. Which markers exist and what they say is a topic of its own.

Why preparations say 400 or 800 µg

Neither figure comes from the general daily requirement, but from a single, very specific recommendation.

400 µg is the amount that the DGE and the BfR name for women who want to become pregnant or could become pregnant — expressly in addition to a folate-rich diet, beginning at the latest four weeks before the start of the pregnancy and continuing until the end of the first trimester. The BfR describes this supplementation as the most suitable measure for preventing neural tube defects in the child.

800 µg is the answer to a practical circumstance: very few pregnancies begin according to plan. The German network Gesund ins Leben therefore recommends that women who have not started at least four weeks before conception take 800 µg of folic acid per day until the end of the 12th week of pregnancy. Behind this lies a target figure in the blood: for the greatest possible risk reduction, the World Health Organization names a red blood cell folate concentration of ≥ 906 nmol/l in women of childbearing age. It takes weeks for this value to be reached — the higher dose shortens that time. The timing and the deadlines are set out in detail in folic acid in pregnancy: 400 µg, from when.

For everyone else, 400 or 800 µg do not cover a requirement but are simply a higher intake. There is nothing wrong with that as long as the upper level is observed — the pack size just does not answer the question about the requirement.

And why the BfR proposes 200 µg for preparations

It is worth following this calculation once, because it explains why an authority names a figure that hardly appears on the shelf. In opinion 009/2024 of 22 February 2024, the German Federal Institute for Risk Assessment recommends a maximum amount of 200 µg of folic acid per recommended daily intake of a food supplement. The route to it:

1. Food supplements should be safe for everyone from the age of 15. The decisive figure is therefore the upper level for 15- to 17-year-olds: 800 µg per day.
2. Folate from ordinary food is not counted — the full remaining amount of 800 µg stays available.
3. This is divided equally between food supplements and fortified foods: 400 µg per category.
4. Because the same person can take several preparations at the same time, an uncertainty factor of 2 is added: 200 µg.

Two qualifications belong with this. First, the BfR expressly exempts the 400 µg for women of childbearing age and for pregnant women in the first trimester from this recommendation — but requires clear labelling on such products. Second, the proposal is addressed to risk management and is intended to serve as the basis for binding EU maximum amounts. Such maximum amounts for vitamins in food supplements have to this day not been set at EU level. The figure therefore describes what the BfR considers appropriate, not what applies.

The upper level and where it comes from

The tolerable upper intake level (UL) is 1,000 µg per day for adults, including pregnant and breastfeeding women, and 800 µg for 15- to 19-year-olds. It applies to synthetic folic acid and the authorised 5-MTHF compounds together, not to folate from foods.

The endpoint from which it was derived is not a risk of poisoning. In 2000 the EU Scientific Committee on Food took as its basis that from about 5 mg of folic acid per day a vitamin B12 deficiency can be masked in the blood count; with an uncertainty factor of 5 this gave the 1,000 µg. EFSA reviewed this derivation in 2023 and confirmed it. Why the B12 question always runs alongside folic acid is set out in vitamin B12 and folic acid: why the gap is masked; the matching strength for it is Vitamin B12 1000 µg.

What this means for the pack on the shelf

There are two figures on the label that you need: the amount per daily dose and the percentage of the nutrient reference value. Set both against the 200 µg and you know immediately where a product stands.

Folic acid 1000 µg carries 500 % NRV per tablet. This amount corresponds exactly to the upper level for adults — it lies at it, not above it, and it applies to the intake from all preparations and fortified foods together. Anyone also using a multi-preparation or fortified cereals should count their folic acid share as well. Further strengths and combinations are in the folic acid category.

A percentage above 100 in itself means neither "too much" nor "particularly effective". It only means: more than the labelling figure. Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.

For folate, eight claims are authorised in the EU under Regulation (EU) No 432/2012; these five describe what the vitamin is involved in and apply irrespective of the compound in the product:

Folate contributes to normal blood formation.

Folate contributes to normal amino acid synthesis.

Folate contributes to normal psychological function.

Folate contributes to the reduction of tiredness and fatigue.

Folate contributes to maternal tissue growth during pregnancy.

Frequently asked questions

I take 400 µg of folic acid — does that exceed my requirement? Arithmetically yes, measured against the 300 µg of folate equivalents: 400 µg of folic acid correspond to around 680 µg of folate equivalents, and the folate from the diet comes on top. At the same time, 400 µg lie clearly below the upper level of 1,000 µg for synthetic intake. "Above the reference value" and "above the upper level" are two different statements; only the second would be a problem.

Does the daily requirement apply equally to men and women? Yes. From the age of 13 the D-A-CH reference values name 300 µg of folate equivalents for both. Deviations exist only for pregnant women (550 µg), breastfeeding women (450 µg) and women planning a pregnancy, for whom an additional 400 µg of synthetic folic acid is recommended.

If 86 % are well supplied — do I need a preparation at all? For the general case that is a question for your own menu and, where appropriate, for a laboratory value, not for a population statistic. The recommendation is unambiguous only when planning a pregnancy and in early pregnancy: there, the DGE and the BfR advise supplementation regardless of the starting value, because the time window is too short to close through the diet.

Why do some packs say "200 µg" as the daily dose? That corresponds exactly to the BfR's maximum-amount recommendation for food supplements and at the same time to 100 % of the nutrient reference value. Such products are designed for general intake, not for the situation before and at the beginning of a pregnancy.