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Limited evidenceVitamins & minerals

Chromium Polynicotinate

Niacin-bound chromium sold for blood sugar and cravings. Chromium as a class produces small, inconsistent glycaemic changes in people with diabetes, and this particular form has barely been studied on its own.

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What the science says

  • Small glycaemic changes in type 2 diabetes Limited evidence

    A systematic review and meta-analysis of randomized trials found chromium supplementation modestly reduced fasting glucose and HbA1c in people with type 2 diabetes, with high heterogeneity between studies. Effects in people without diabetes are not established.

  • Little effect on body composition Limited evidence

    A dose-response systematic review and meta-analysis of randomized trials in type 2 diabetes found minimal effects of chromium on body weight and composition. Appetite and craving claims are not supported by this evidence.

  • The polynicotinate form is barely studied Limited evidence

    One randomized trial in hypercholesterolaemic children found low-dose chromium polynicotinate affected lipids only when combined with glucomannan. Almost all other chromium research uses picolinate or chloride, so form-specific claims are unsupported.

Dosage & safety

Studied doseTrials of chromium generally used 200–1,000 µg/day of elemental chromium. Adequate intake for adults is 25–35 µg/day, which diet normally covers.
SafetyUsually well tolerated, but case reports link high-dose chromium supplements to liver injury, kidney problems and acute pancreatitis. The niacin component can cause flushing. Avoid high doses in kidney or liver disease, and monitor glucose closely if you take diabetes medication, since additive effects are possible.

How to take it

TimingTiming does not matter; split higher doses across two meals.
With food?Take it with food, which improves tolerance and absorption.
Worth knowingThe nicotinate form can cause a harmless flushing sensation — a smaller dose with food usually settles it.

Interactions

With medications

  • insulin, sulfonylureas and other diabetes medication

    Chromium may add to their glucose-lowering effect. Monitor glucose closely and discuss dose adjustment with your prescriber

  • levothyroxine

    Chromium binds thyroid hormone in the gut and reduces its absorption. Separate by at least 4 hours

  • NSAIDs and antacids

    They alter chromium absorption in opposite directions, making intake unpredictable. Take chromium at a different time of day

With other supplements

  • high-dose calcium carbonate

    Reduces chromium absorption. Separate the doses

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does chromium polynicotinate lower blood sugar?

Chromium as a class modestly reduced fasting glucose and HbA1c in type 2 diabetes in a meta-analysis, with high heterogeneity, and the effect is not established without diabetes. The polynicotinate form itself is barely studied, so the evidence for chromium polynicotinate is limited.

Does chromium help with weight loss or sugar cravings?

A meta-analysis found minimal effects of chromium on body weight and composition, and appetite or craving claims are not supported. Chromium polynicotinate's evidence for weight loss is limited.

How much chromium polynicotinate should I take?

Chromium trials generally used 200–1,000 mcg/day of elemental chromium, while adults need only 25–35 mcg/day, which diet normally covers. Take chromium polynicotinate with food, splitting higher doses across two meals.

Is chromium safe with diabetes medication or levothyroxine?

Chromium may add to the glucose-lowering effect of insulin and sulfonylureas, so monitor glucose closely, and separate chromium polynicotinate from levothyroxine by at least 4 hours. High-dose chromium has been linked in case reports to liver injury, kidney problems and pancreatitis.

Scientific references

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