Chromium dinicocysteinate

MineralChromiumBest with a meal

What is it

Chromium dinicocysteinate (sold as Zychrome) is a complex of trivalent chromium with niacin (nicotinic acid) and L-cysteine, marketed as a high-bioavailability chromium supplement for glucose metabolism support.

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Glucose control in type 2 diabetes

Limited Evidence

Small manufacturer-sponsored trials of Zychrome show modest improvements in glycemic markers. Broader chromium evidence in diabetes is mixed.

Insulin sensitivity

Limited Evidence

Limited evidence for modest improvements; effect sizes are small and not consistently replicated.

How it works

Trivalent chromium (Cr-III) is a trace mineral with a debated role in insulin signaling. It is proposed to enhance insulin receptor activity, possibly via chromodulin (a low-molecular-weight chromium-binding peptide) facilitating tyrosine kinase activity at the insulin receptor. The dinicocysteinate complex is designed to improve absorption and reduce oxidative stress compared with chromium picolinate. Limited clinical trials, primarily small studies sponsored by the manufacturer, report improvements in HbA1c, fasting glucose, and insulin resistance in people with type 2 diabetes. The broader case for chromium supplementation in type 2 diabetes is mixed. Meta-analyses show modest effects at best, and chromium is no longer considered an essential nutrient by the EFSA, though the US still recognizes an Adequate Intake.

Dosage

Studied doses of Zychrome range from 200 to 800 mcg of elemental chromium per day. The US Adequate Intake for chromium is 25 to 35 mcg/day in adults. No formal UL is set, but doses above 1,000 mcg/day are not recommended.

When and how to take it

Generally taken with food, once daily or split with meals. Effects on glucose markers, if present, emerge over weeks to months.

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Chromium dinicocysteinate (Zychrome)

Branded form used in supplement formulations targeting glucose support.

Manufacturer claims improved absorption vs picolinate; comparative bioavailability data are limited.

Chromium picolinate

Standard reference chromium supplement.

Most common and most studied chromium form.

Chromium polynicotinate

Alternative chelated form.

Chromium bound to niacin.

Safety

Trivalent chromium at supplement doses is generally well tolerated. Side effects are uncommon and include mild GI upset. Rare reports of liver, kidney, or skin reactions exist with chromium picolinate at high doses; the dinicocysteinate form has limited long-term safety data. Hexavalent chromium (Cr-VI) is toxic and is not used in supplements.

Who should be cautious

People with diabetes on glucose-lowering medications should monitor blood sugar closely. Pregnancy and breastfeeding: avoid high-dose chromium supplements; food-level intake is adequate. Liver or kidney disease: consult a clinician.

Interactions

May modestly enhance the effects of antidiabetic medications, increasing hypoglycemia risk. Antacids and proton pump inhibitors may reduce chromium absorption. Iron and calcium supplements taken simultaneously may compete for absorption.

Food sources

Broccoli

Amount
1/2 cup
%DV
—

Grape juice

Amount
1 cup
%DV
—

Whole wheat bread

Amount
2 slices
%DV
—

Brewer's yeast

Amount
1 tbsp
%DV
—

Frequently asked questions

Is Zychrome better than chromium picolinate?⌄

Manufacturer studies suggest improved bioavailability and possibly less oxidative stress, but independent comparative evidence is limited.

Should I take chromium if I have prediabetes?⌄

Evidence for chromium in glucose control is modest at best. Lifestyle interventions (diet, exercise) have stronger evidence. Discuss with a clinician before adding chromium.

References

Chromium dinicocysteinate on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Chromium dinicocysteinate (PubMed search) — PubMed link

Track Chromium dinicocysteinate with Pilora

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.