Chromium deficiency: what is actually documented

The short answer: an unambiguous chromium deficiency has been described in humans in exactly three case reports — and in all three the patients had been fed artificially through a vein for months to years, with an infusion solution that contained no chromium. From a normal diet, no chromium deficiency is documented. And a blood test does not answer the question, because to this day there is no usable status marker for chromium.

That is an unusual finding for a trace element that sits on the shelf between iron and zinc. Anyone who wants to know whether they are short of chromium will find no reliable answer — not because nobody has looked, but because the measurement method is missing. What can be said is what a genuine deficiency looked like when it occurred, and what to think of instead.

The three documented cases

Case	Situation	Findings	What the chromium changed
Jeejeebhoy et al., 1977	woman, 40 years old, fed entirely through a vein for more than 5 years	after 3½ years 15 % weight loss, peripheral neuropathy (confirmed by nerve conduction measurement), glucose tolerance K = 0.89 %/min (normal > 1.2), negative chromium balance	250 µg chromium daily in the infusion, 2 weeks: K = 1.35, no insulin needed for 5 months, nerve conduction and well-being back to normal
Freund et al., 1979	patient after complete removal of the bowel, 5 months of feeding through a vein	severe glucose intolerance, weight loss, a confusional state resembling encephalopathy	150 µg chromium daily: glucose intolerance receded, less insulin needed, weight gain, the confusional state disappeared
Brown et al., 1986	woman, 63 years old, months of stable feeding through a vein with only 6 µg chromium daily, plus high losses through the bowel	unexplained high blood sugar and sugar in the urine, plasma chromium 0.1 µg/dl (laboratory reference 1.8–3.8 µg/dl)	14 days of 200 µg chromium chloride intravenously: insulin could be stopped completely, no renewed high blood sugar

Three things stand out in this table.

First: intake was not merely tight in any of these cases but practically zero — over months to years, bypassing stomach and bowel, in part with additional elevated losses. Eating does not create a comparable situation, not even one-sided eating.

Second: the pictures differ. The 1977 case showed nerve involvement and weight loss, the 1986 case exclusively a disturbed handling of glucose. So there is no symptom pattern by which a chromium deficiency could be recognised outside that situation.

Third: the maintenance amount on which the 1977 patient subsequently remained free of complaints was 20 µg per day into the vein — half as much as the nutrient reference value printed on packs today.

Why this does not become an everyday risk

The European assessments draw their conclusions from precisely these cases — and those conclusions are cautious. According to the European Food Safety Authority (EFSA), only the results from studies in patients on long-term feeding through a vein suggest that chromium might be essential for humans. The data are not sufficient to derive an average requirement; nor does the authority see scientific evidence that a chromium intake produces beneficial effects in healthy people. The German Federal Institute for Risk Assessment (BfR) summarises this state of affairs in its opinion on maximum levels for chromium.

Then there is the intake side. In German duplicate studies — where a second, identical portion of every meal is analysed — mean chromium intake from food was 61 ± 31 µg per day in women and 84 ± 55 µg per day in men. Both values lie within the D-A-CH estimated range of 30 to 100 µg for adolescents from 15 years and adults. How the µg figure on a pack relates to the nutrient reference value of 40 µg, and what else is worth checking before buying, is set out in Buying chromium: µg, form and combination products.

A broad undersupply would be visible in consumption data — it is not. The second German National Nutrition Survey did not even record chromium, which says something about how urgent the question was considered to be in nutrition research. Where intake comes from in everyday life, and why the table values vary so widely, is covered in Chromium in foods.

The blood test that does not settle the question

Anyone who wants their doctor to "check chromium" runs into a methodological problem older than most of the products on sale.

Marker	What is measured	Why it leaves the question open
Chromium in serum or plasma	chromium content of the blood fluid	does not reliably reflect body stores; in the 1986 case the plasma value stayed unchanged after successful chromium treatment
Chromium in urine	one day's excretion	fluctuates strongly with intake over the past hours, not with the body's holdings
Chromium in hair	deposition over weeks	can be contaminated from outside; no established reference limits
Blood glucose and insulin values	glucose metabolism	were used as a clue in the case reports, but are unspecific

The case reports themselves formulate the warning. In the 1986 patient, plasma chromium values remained unchanged even after successful treatment; the authors attribute this to the detection limit of the method, uncertain reference ranges and the fact that plasma levels do not always represent the body's total holdings — and they expressly advise caution in interpretation.

An Australian study of 79 pregnant women with an abnormal glucose test examined this systematically: between women with low plasma chromium (≤ 3 nmol/l) and the rest, there was no difference in glucose, insulin or blood lipid values. The paper concludes that a method for determining body stores would first have to be developed.

There is also a historical stumbling block. The normal range against which measurements were made in 1977 was 4.9 to 9.5 ng/ml of blood. A 1992 study in children measured a mean of 0.10 µg/l in control children using modern technique — around one fiftieth of that. The difference is not a biological change but the elimination of contamination during sampling and analysis. Laboratory values from different decades are therefore not comparable for chromium, and a value without a statement of the method says little.

In hospital, too much is the more common problem

The children's study just mentioned reverses the expectation. It examined 15 children who had been fed through a vein for a median of 9.5 years. Their chromium intake, averaging 0.15 µg per kilogram of body weight per day, was below the recommendation of 0.20 µg that applied at the time — and yet their serum chromium was on average 20-fold higher (range 4- to 42-fold) than in the comparison children. The reason: chromium is present as a contaminant in the solutions themselves (1.0–1.8 µg/l), in fat emulsions (0.9 µg/l) and in drinking water (4.3–5.7 µg/l). After the chromium addition was stopped, the group still reached 0.05 µg/kg per day, and nobody showed signs of deficiency.

For the deficiency question this means: even in the single situation in which it was ever demonstrated, it is today hardly the obvious explanation.

What to think of instead

In practice the question of a chromium deficiency rarely comes from the laboratory; it comes from advertising: cravings for sweets, afternoon fatigue, stubborn kilos. There is no authorised claim for these attributions — on the contrary, three applications concerning chromium and body weight are listed as not authorised in the EU register. Cravings and appetite are also not measurable against a chromium value: without a status marker, the relationship cannot be tested at all.

Anyone noticing persistent fatigue, unintended weight loss or unusual thirst is well advised to have it clarified medically — the obvious laboratory values are then different ones, and more informative than a chromium determination. The data are thin for athletes too, who are often named as a risk group: the additional chromium loss through urine after a training session is in the range of hundredths of a microgram.

When a supplement is an option anyway

Chromium can be supplemented without a deficiency having been demonstrated — with food supplements that is the normal case and legally unproblematic. It is sensible to know the orders of magnitude: the BfR proposes 60 µg per recommended daily portion to the legislator, the EFSA names 250 µg as a guidance value for additional intake from supplements and fortified foods, and binding European maximum levels do not exist to this day.

Our Chromium 200 µg sits between those two figures at one tablet per day — 200 µg chromium as chromium picolinate, arithmetically 500 % of the nutrient reference value. Anyone also taking a combination product containing chromium should add up the labels.

Which compound appears on the label is a question of its own; six chromium sources are permitted in food supplements, and they differ in absorption — the comparison is in Chromium forms: picolinate, chloride and yeast. An overview of the trace elements is in the Minerals category.

Two claims are authorised for chromium, in exactly this wording: Chromium contributes to normal macronutrient metabolism. Chromium contributes to the maintenance of normal blood glucose levels. (Regulation (EU) No 432/2012). What the second sentence actually covers is explained in Chromium and blood sugar. Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.

Frequently asked questions

Can I have a chromium deficiency tested? A chromium determination in blood is technically possible but does not answer the question. Plasma and serum values do not reliably reflect body stores — in the documented case from 1986 the value remained unchanged after successful chromium treatment. There is no recognised method for determining chromium status.

How would a deficiency have been recognised in the cases described? By a disturbed handling of glucose that could not be explained by insulin, in part accompanied by weight loss, nerve involvement or confusion. All three cases occurred during months to years of feeding through a vein, and the diagnosis was only certain once the chromium treatment reversed the findings.

Am I more affected as a vegetarian or vegan? There is no data basis for that. According to the DGE, chromium is found in meat and eggs, but equally in oats and tomatoes; measured intake in Germany lies within the estimated range. Because a reliable nutrient table for chromium is missing, dietary patterns cannot seriously be compared against each other here.

Are cravings for sweets a sign of chromium deficiency? Not on the available evidence. Claims on chromium and body weight were examined in the EU register and not authorised, and a relationship between appetite and chromium status is not testable at all in the absence of a status marker.

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Sources: Jeejeebhoy KN et al., Chromium deficiency, glucose intolerance, and neuropathy reversed by chromium supplementation, in a patient receiving long-term total parenteral nutrition, Am J Clin Nutr 1977;30(4):531–8 (PMID 192066); Freund H et al., Chromium deficiency during total parenteral nutrition, JAMA 1979;241(5):496–8 (PMID 104057); Brown RO et al., Chromium deficiency after long-term total parenteral nutrition, Dig Dis Sci 1986;31(6):661–4 (PMID 3086063); Moukarzel AA et al., Excessive chromium intake in children receiving total parenteral nutrition, Lancet 1992;339(8790):385–8 (PMID 1346659); Gunton JE et al., Serum chromium does not predict glucose tolerance in late pregnancy, Am J Clin Nutr 2001;73(1):99–104 (PMID 11124757); German Federal Institute for Risk Assessment, proposals for maximum levels of chromium in foods including food supplements (2021) — containing the EFSA assessment of 2014 (no Average Requirement, no AI/PRI), the guidance value of 250 µg (EFSA 2010), the D-A-CH estimated values and the duplicate-study intakes (Anke et al. 1998, cited in D-A-CH); EFSA NDA Panel, Scientific Opinion on Dietary Reference Values for chromium, EFSA Journal 2014;12(10):3845; Regulation (EU) No 432/2012 (official wording of the authorised claims); EU Register of nutrition and health claims (non-authorised claims on chromium and body weight); Regulation (EU) No 1169/2011, Annex XIII (nutrient reference value chromium 40 µg); composition and recommended intake according to the label of the product named.