Chromium
Trivalent chromium was proposed decades ago as a "glucose tolerance factor" that amplifies insulin signaling. No chromium-dependent enzyme has ever been identified, convincing deficiency has been documented only in patients on long-term intravenous nutrition without chromium, and in 2014 the European Food Safety Authority concluded it could not set any intake requirement for it.
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What It Does
The proposed mechanism is a small chromium-binding peptide (chromodulin) that enhances insulin receptor activity. That model comes mainly from animal and cell work and remains contested. EFSA's 2014 review found no evidence of beneficial effects of chromium intake in healthy people and declined to set an Adequate Intake (EFSA 2014). The US still has one, 25-35 mcg a day, easily met by diet.
The glucose evidence rests heavily on a single trial. In 180 Chinese adults with type 2 diabetes, 1,000 mcg a day of chromium picolinate lowered HbA1c from 8.5% to 6.6% over four months (Anderson 1997). That effect, larger than many diabetes drugs, has not been reproduced in Western populations, possibly because baseline status differed. A meta-analysis found no effect on glucose or insulin in people without diabetes and called the diabetes data inconclusive (Althuis 2002). A later review of 20 trials in type 2 diabetes found few participants reached glycemic targets and limited evidence of benefit (Costello 2016). FDA's own evidence review allowed only a qualified health claim describing the link to insulin resistance as "highly uncertain" (Trumbo 2006). Weight-loss effects in trials are around 1 kg, too small to matter.
Forms and Bioavailability
Absorption ratings are broad tiers. Head-to-head human trials rarely support a finer ranking among well-absorbed forms.
| Form | Elemental % | Absorption | Typical dose | Cost | Labels |
|---|---|---|---|---|---|
| Chromium PicolinateChromax | 12.4% | LowChromium absorption is low for all forms, roughly 0.4-2.5%. Picolinate is absorbed somewhat better than chromium chloride. | 200-1,000 mcg daily in glucose trials | Low | 325 |
| Chromium Polynicotinatechromium nicotinate, ChromeMate | Varies | LowChromium bound to niacin. Absorption is low like other chromium forms; comparative human data are limited. | 200-600 mcg daily | Moderate | 85 |
| Chromium Chloridechromic chloride | 19.5% | LowInorganic trivalent chromium; the most poorly absorbed common form. | Found in multivitamins at 35-120 mcg | Low | 9 |
Labels column: number of labels named as chromium products that list this form. A product can list more than one form, and some labels do not state a form at all.
Chromium is poorly absorbed in every form, generally under 2.5%. Picolinate is the most studied and absorbs somewhat better than chloride. Its safety questions concern the picolinate ligand: in hamster cells it caused chromosome damage attributed to the picolinate rather than the chromium (Stearns 1995). Human relevance is unproven, and isolated case reports describe kidney and liver injury with high doses. Polynicotinate (niacin-bound chromium) is marketed as an alternative; its own human data are thinner still.
Typical Dosing
| Group | Adequate Intake (AI) |
|---|---|
| Men 19-50 | 35 mcg |
| Men 51+ | 30 mcg |
| Women 19-50 | 25 mcg |
| Women 51+ | 20 mcg |
| Upper limit (UL) | None established |
Trials for glucose control have used 200-1,000 mcg per day, with inconsistent results.
Food sources: broccoli, grape juice, whole wheat English muffin, potatoes, garlic, beef, turkey breast.
What to Look For
Chromium is listed in mcg. If you take it at all, keep the dose at 200 mcg or less, and check multivitamins and "blood sugar support" blends, which often contain it alongside cinnamon, berberine, or bitter melon. People on insulin or a sulfonylurea should tell their prescriber, since any glucose-lowering effect adds to the medication.
Chromium is not a treatment for diabetes or prediabetes, and no product should be marketed as one.
Chromium Picolinate
The form in nearly all of the positive trials, which are few and dated. Not a substitute for diabetes treatment.
What to look for: 200 mcg or less. Tell the prescriber if you use insulin or a sulfonylurea.
Find on iHerb Affiliate linkChromium Polynicotinate
Avoids the picolinate ligand, with even less efficacy data.
What to look for: No evidence-based reason to choose it over picolinate; the same dose ceiling applies.
Find on iHerb Affiliate linkProducts on Titrate
16,310 of the 214,745 labels in the NIH Dietary Supplement Label Database list chromium as an active ingredient (7,888 on market). 621 are sold as chromium products by name.
Top on-market labels, ranked by label completeness and simplicity:
- Chromium Chelate GTF 500 Milligrams
- Albion Chromium 200 mcg
- Chitosan 500 mg Plus Chromium
- Chitosan 500 mg Plus Chromium
- Chitosan 500 mg Plus Chromium
Chromium does not have its own search category yet. Each product above links to its full label in the NIH database.
Related Tools
References
NIH Office of Dietary Supplements. Chromium: Fact Sheet for Health Professionals.
Stearns DM, et al. Chromium(III) picolinate produces chromosome damage in Chinese hamster ovary cells. FASEB J. 1995;9(15):1643-1648.
Anderson RA, et al. Elevated intakes of supplemental chromium improve glucose and insulin variables in individuals with type 2 diabetes. Diabetes. 1997;46(11):1786-1791.
Althuis MD, et al. Glucose and insulin responses to dietary chromium supplements: a meta-analysis. Am J Clin Nutr. 2002;76(1):148-155.
Trumbo PR, Ellwood KC. Chromium picolinate intake and risk of type 2 diabetes: an evidence-based review by the United States Food and Drug Administration. Nutr Rev. 2006;64(8 Pt 1):357-363.
EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on Dietary Reference Values for chromium. EFSA J. 2014;12(10):3845.
Costello RB, et al. Chromium supplements for glycemic control in type 2 diabetes: limited evidence of effectiveness. Nutr Rev. 2016;74(7):455-468.
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