How this connection first came under scientific scrutiny, the route this trace element takes through the body, and the exact sentence the EU authorized — three chapters, one after another.
The observation behind today’s discussion of chromium comes from animal studies in the late 1950s. Rats fed a chromium-poor, semi-synthetic diet for months took noticeably longer, after a test dose of glucose, to bring its blood concentration back down to the starting level than animals on an ordinary feed mix. A water-based extract of brewer’s yeast offset that delay in the same test animals.
Researchers Klaus Schwarz and Walter Mertz named the unknown active component of this extract the “Glucose Tolerance Factor” in 1959. It took several more years before trivalent chromium could be isolated and characterized as the inorganic building block of that factor. The original name still turns up in older scientific literature, even though it no longer appears in the current EU claim.
Later observations in people who were fed intravenously for extended periods, bypassing the digestive tract entirely and receiving no chromium, pointed to a similar pattern to the early animal trials. These rare clinical cases from the 1970s are among the early groundwork that later scientific opinions draw on.
Of the chromium taken in through food, only a small part actually reaches the blood. Figures in the scientific literature range from under one to close to two percent of the amount consumed — noticeably lower than for many other trace elements. In blood plasma, chromium travels mostly bound to transferrin, the same carrier protein that also moves iron through the body. When very large amounts of either element are present, this can measurably affect how much binding capacity is left over for the other one.
Absorbed chromium is stored in small amounts in the liver, kidney, and bone tissue. The much larger share, though, leaves the body through the kidneys in urine, without being kept in storage for long.
| Food | Chromium (µg, rounded) |
|---|---|
| Broccoli, cooked (1 serving) | approx. 11 |
| Grape juice (200 ml) | approx. 8 |
| Whole-grain bread (2 slices) | approx. 4 |
| Mashed potatoes (1 serving) | approx. 3 |
| Brewer’s yeast (1 tablespoon) | approx. 3 |
These are rounded reference figures from food composition tables, and they shift with soil, farming methods, and preparation — meant as general orientation, not for calculating an exact daily amount.
The EU-authorized sentence on chromium is kept brief and names no mechanism, enzyme, or carrier protein specifically. The sections above place that wording in its scientific context, but they don’t add anything to it.
“Chromium contributes to the maintenance of normal blood glucose levels.” EU-authorized wording · Regulation (EU) No 432/2012.
What’s described is a process that runs its normal physiological course when chromium intake is adequate. The wording is fixed and may not be expanded or rephrased.
Annex XIII of Regulation (EU) No 1169/2011 sets a daily reference intake of 40 µg of chromium for adults. This figure is mainly meant for food labeling and isn’t an individual intake recommendation for any one person.
Because the chromium content of food depends more on soil and farming than is the case for many other trace elements, a varied diet drawing on several of the foods listed above will, as a rule, provide an adequate amount. Anyone using a chromium supplement is best off sticking to the daily amount stated on the package.
No. It addresses adults as a whole; the text doesn’t call out any specific age group within that population.
Anyone eating several servings a week from the list above typically reaches the 40 µg daily reference intake without a supplement. The exact contribution of any single food, though, varies from one harvest to the next.
It was a working name from the 1950s for a component of brewer’s-yeast extract that hadn’t yet been chemically identified at the time. The name belongs to the history of the research and isn’t itself part of today’s official wording.
In practice, blood chromium levels are rarely measured, because the testing method is technically demanding and prone to interference. A medical professional with access to suitable methods is best placed to interpret a result like that.
No. This page brings together publicly available, scientifically grounded knowledge about a single trace element, and it doesn’t replace individual guidance from a doctor or a qualified registered dietitian.
After purchase, every chapter on this page stays available for good — the questions gathered here included, and the table of food values too.
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This page brings together scientifically grounded background on chromium for readers who want to learn more. It isn’t meant as individual nutrition counseling and doesn’t replace a personal assessment by a doctor or a qualified registered dietitian. A pack that young children can get hold of is a pack stored in the wrong spot. Dietary supplements should only be taken in the daily amount printed on that pack. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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