Chromium and exercise: what the claims allow

The short answer: two health claims are authorised for chromium, and both are about metabolism — not about muscle, not about strength, not about endurance. Four training studies using 200 to 924 µg a day over eight to sixteen weeks looked for exactly that and found nothing: the participants got stronger, but no stronger with chromium than without. And the argument that training uses up chromium can be quantified — it is a matter of hundredths of a microgram per day.

Chromium has a long history on the sports shelf. It begins in the early nineties with the idea that the trace element could enhance the action of insulin and thereby improve nutrient transport into the muscle cell. The idea was good enough to be investigated — and it has been investigated.

Two sentences are permitted, four applications were rejected

What a manufacturer may say about chromium is set out in Regulation (EU) No 432/2012. There are two wordings:

• Chromium contributes to normal macronutrient metabolism.
• Chromium contributes to the maintenance of normal blood glucose levels.

Both may only be used if the product is at least a “source of” trivalent chromium — that is, if it reaches 15 % of the nutrient reference value per portion, which is 6 µg. What else was applied for is also in the EU register, with status and reasoning:

Claim as submitted (original wording)	Health relationship	Status
“Promotes carbohydrates catabolism, helping in body weight maintaining” (ID 4665)	Maintenance or achievement of a normal body weight	not authorised
“Promotes lipid catabolism, helping in body weight maintaining” (ID 4666)	as above	not authorised
“Promotes metabolism. Supports weight control physiologically” (ID 339)	as above	not authorised
Claim on chromium (III) in the context of inadequate micronutrient supply (ID 261)	Reduction of tiredness and fatigue	not authorised

The last entry is the most interesting one for people who train: the fatigue claim has also been assessed for chromium and was not confirmed. For magnesium, iron and vitamin B12 it appears on the list; for chromium it does not. A claim on muscle mass, strength or physical performance has never been authorised for chromium — it simply does not appear in the list of permitted claims.

The training studies: four attempts, one result

Between 1996 and 1999 the question was examined in controlled resistance-training studies — some double-blind, some using very high amounts, some in competitive athletes. The results are remarkably close to one another.

Study	Participants	Amount and duration	Result
Hallmark et al. 1996, Med Sci Sports Exerc 28(1):139–144	16 untrained men	200 µg/day, 12 weeks of resistance training 3×/week	Strength rose in both groups (24 % and 33 %); body weight, body fat percentage and fat-free mass unchanged
Lukaski et al. 1996, Am J Clin Nutr 63(6):954–965	36 men, double-blind	3.3–3.5 µmol/day as chloride or picolinate, 8 weeks	Strength, fat-free mass and muscle mass rose with the training — independently of the chromium dose
Walker et al. 1998, Med Sci Sports Exerc 30(12):1730–1737	20 NCAA Division I wrestlers	200 µg chromium picolinate/day, 14 weeks of preparation	No significant changes in body composition in any group; endurance performance rose equally in all groups
Campbell et al. 1999, J Appl Physiol 86(1):29–39	18 men, aged 56–69	924 µg/day as chromium picolinate, 12 weeks	Training-induced strength gains not amplified; muscle mass and muscle fibre area rose independently of chromium

The Campbell study is the toughest test of the hypothesis: 924 µg a day is almost four times the level up to which the European Food Safety Authority (EFSA) sees no concern for supplemental intake, and roughly ten to fifteen times what usually arrives through the diet. Urinary chromium excretion rose about fifty-fold as a result — so the body did take the substance up. It made no difference to the outcome. On one sub-measure, knee extensor muscle power, the placebo group even did better.

Harold Lukaski, who led one of the studies himself, summarised the position in a review in the American Journal of Clinical Nutrition (2000;72(2 Suppl):585S–593S): chromium supplementation in young men and women promotes neither muscle gain nor fat loss nor gains in strength.

The broadest overview of minerals in sport to date (Heffernan et al., Nutrients 2019;11(3):696) evaluated 130 investigations, twelve of them on chromium. Its conclusion: for minerals as a whole there is little evidence of improvement in athletic measures; the only two rated as having “strong” evidence quality were iron — in specific situations — and magnesium.

“Training uses up chromium” — the numbers behind it

The most common argument for chromium in sport is not about effect but about consumption: people who train are said to excrete more chromium and therefore need to replace it. The finding behind this does exist — it is simply smaller than it sounds.

In a study by the US Department of Agriculture (Anderson et al., J Appl Physiol 1988;64(1):249–252), eight trained and five untrained men were placed on a strictly controlled diet. Two findings:

• Baseline excretion was lower in the trained men, not higher: 0.09 ± 0.01 µg per day compared with 0.21 ± 0.03 µg in the untrained men.
• On a day with exercise to exhaustion at 90 % of maximal oxygen uptake, excretion in the trained men rose to 0.12 µg per day. In the untrained men nothing changed after controlled exercise.

The exercise-related increase therefore amounts to roughly 0.03 µg per day. For comparison: according to European consumption data, the mean dietary intake of adults is 57 to 84 µg a day. The amount “used up” by an exhausting training session is thus a fraction of one per cent of what is on the plate anyway.

A later study using a stable chromium isotope (Rubin et al., J Nutr 1998;128(1):73–78) confirmed that both acute and multi-week resistance training raise excretion — and explicitly reads the finding differently: the higher losses are compatible with increased absorption. More in the urine does not necessarily mean less in the body; it can also mean that more arrived.

On top of this comes a limitation that affects every discussion of chromium status. In its 2014 assessment of reference values (EFSA Journal 2014;12(10):3845), the EFSA noted that urinary chromium excretion was independent of intake at intakes between roughly 10 and 60 µg per day, and that there are no markers for the body’s chromium stores. Little is lost through sweat in any case — the main route is urine, with sweat and bile playing a minor role according to the same assessment.

If you want to know why chromium status fundamentally cannot be measured, and what that means for how long to take it, that is covered in How to take chromium: timing, meals and intervals.

The amounts in question

Value	Amount per day	Origin
Nutrient reference value (label, “% NRV”)	40 µg	Regulation (EU) No 1169/2011, Annex XIII
Estimated value for an adequate intake, from age 15	30–100 µg	D-A-CH, cited after BfR 2021
Proposed maximum level for food supplements	60 µg per daily portion	German Federal Institute for Risk Assessment (BfR), 2021
Guidance value for supplemental intake	250 µg	EFSA 2010, corresponds to the WHO value
Dose in the training studies	200 µg and 924 µg	Hallmark 1996, Walker 1998 / Campbell 1999

Our Chromium 200 µg provides 200 µg per tablet as chromium picolinate — the same compound and the same order of magnitude as in three of the four training studies. The amount is above the BfR proposal of 60 µg and below the EFSA guidance value of 250 µg; binding European maximum levels for food supplements still do not exist. What distinguishes the individual compounds, and why chromium in general is absorbed only to a small extent — for dietary chromium the EU Scientific Committee on Food gives 0.4 to 2.5 % — is set out in Chromium forms compared.

Exactly what the authorised blood glucose claim covers — and why “maintenance” is something other than “lowering” — is taken apart in Chromium and blood sugar.

What does carry an authorised claim in sport

Anyone looking on the shelf for a nutrient with a link to muscle work will find one — just not in chromium. These wordings appear in the text of Regulation (EU) No 432/2012:

Nutrient	Authorised claim
Magnesium	Magnesium contributes to normal muscle function.
Magnesium	Magnesium contributes to electrolyte balance.
Iron	Iron contributes to normal oxygen transport in the body.
Iron	Iron contributes to the reduction of tiredness and fatigue.
Vitamin D	Vitamin D contributes to the maintenance of normal muscle function.

This matches the conclusion of the 2019 review: the two minerals with the best study quality, magnesium and iron, are also the ones with the matching authorised claims. Other trace elements and their reference values are listed in the Minerals category, and all chromium products in the Chromium category.

A word on expectations: a nutrient can close a gap if there is one. If there is none, nothing happens — and that is not a disappointment, it is how it works. Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.

Frequently asked questions

May a chromium product be advertised for muscle building or definition? No. Only the two claims on macronutrient metabolism and on normal blood glucose levels are authorised for chromium. Claims on muscle mass, strength, endurance or body fat do not exist for chromium; the applications submitted on body weight were rejected.

Do athletes have a higher chromium requirement? No additional requirement has been established — not least because the EFSA has derived neither an average requirement nor an estimated value for chromium. The additional exercise-related urinary losses are in the range of hundredths of a microgram per day, against a usual intake of 57 to 84 µg. Anyone eating very one-sidedly or in a large calorie deficit takes in less of every trace element — but that is not a chromium-specific problem.

Why was chromium tested at such different amounts in the studies? Because there was no reference value to orient towards. 200 µg corresponds to a typical commercial amount; the 924 µg used by Campbell were intended as a deliberately high test dose. That both approaches arrived at the same result is the more informative part: a dose-dependent effect should have shown up between 200 and 924 µg.

So is chromium pointless for people who train? It is a trace element with two authorised claims on normal metabolism — and those apply to people who train just as they do to everyone else. What it is not: something that improves training results. That expectation has been tested in controlled studies and was not confirmed.

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Sources: Regulation (EU) No 432/2012 (list of permitted health claims); Regulation (EC) No 1924/2006 (“source of” condition); Regulation (EU) No 1169/2011, Annex XIII (nutrient reference value for chromium, 40 µg); EU Register on nutrition and health claims (European Commission), entries ID 260/401/4665–4667 and 262/4667/4698 (authorised) as well as ID 4665, 4666, 339 and 261 (not authorised), EFSA opinion EFSA Journal 2010;8(10):1732; EFSA NDA Panel, Scientific Opinion on Dietary Reference Values for chromium, EFSA Journal 2014;12(10):3845 (no AR/PRI/AI derivable, no markers for body chromium stores, excretion independent of intake between 10 and 60 µg/day, absorption from foods 0.4–2.5 %, mean adult intake 57.3–83.8 µg/day); EFSA ANS Panel, EFSA Journal 2010;8(12):1882 (250 µg/day supplemental intake); German Federal Institute for Risk Assessment, “Proposed maximum levels for chromium in foods including food supplements” (2021); Hallmark MA et al., Effects of chromium and resistive training on muscle strength and body composition, Med Sci Sports Exerc 1996;28(1):139–144 (PMID 8775366); Lukaski HC et al., Chromium supplementation and resistance training, Am J Clin Nutr 1996;63(6):954–965 (PMID 8644693); Walker LS et al., Chromium picolinate effects on body composition and muscular performance in wrestlers, Med Sci Sports Exerc 1998;30(12):1730–1737 (PMID 9861607); Campbell WW et al., Effects of resistance training and chromium picolinate on body composition and skeletal muscle in older men, J Appl Physiol 1999;86(1):29–39 (PMID 9887110); Lukaski HC, Magnesium, zinc, and chromium nutriture and physical activity, Am J Clin Nutr 2000;72(2 Suppl):585S–593S (PMID 10919964); Anderson RA et al., Exercise effects on chromium excretion of trained and untrained men consuming a constant diet, J Appl Physiol 1988;64(1):249–252 (PMID 3356642); Rubin MA et al., Acute and chronic resistive exercise increase urinary chromium excretion in men as measured with an enriched chromium stable isotope, J Nutr 1998;128(1):73–78 (PMID 9430605); Heffernan SM et al., The Role of Mineral and Trace Element Supplementation in Exercise and Athletic Performance: A Systematic Review, Nutrients 2019;11(3):696 (PMID 30909645); composition and recommended intake as stated on the label of the product mentioned.