Chromium picolinate: what it does for blood sugar and weight, and who should avoid it

What chromium does in the body

The chromium in food and supplements is trivalent chromium (chromium III). Hexavalent chromium is toxic, but it isn’t found in food or supplements. Chromium has long been linked with insulin: it’s thought to help cells respond to the hormone. Yet the evidence is weaker than the marketing suggests.

• EFSA (2014) concluded that an essential role for chromium in human metabolism hasn’t been shown, so no European reference intake was set.
• In the US, adequate intakes are 35 mcg for men and 25 mcg for women aged 19–50, and 30 and 20 mcg over 50.
• No upper limit has been set in the US: few serious side effects have been linked to high intakes, but data are limited.

Chromium is found in meat, wholegrains, vegetables, fruit, nuts, spices and brewer’s yeast. Amounts vary widely with soil and processing. Dairy and sugary foods contain little. Only 0.4–2.5% of the chromium in food is absorbed.

Chromium picolinate and other forms

Labels show elemental chromium, with the compound in brackets: “Chromium (as chromium picolinate) 200 mcg”.

Better absorption doesn’t mean better results. Across chromium trials, the effects are small whichever form is used.

Chromium supplements and blood sugar

Chromium is mostly bought by people with raised blood sugar or sugar cravings. Trials give this picture:

• A 2019 review (58 trials, doses from 1.28 to 1,000 mcg): chromium slightly lowered fasting glucose and HbA1c. The clinical significance is unclear.
• A 2016 review rated the evidence in type 2 diabetes as limited.
• A 24-week trial in 137 people (1,000 mcg a day) found no overall benefit. People with more severe insulin resistance responded slightly better.
• A 2022 review (16 trials, 868 people), cited by NCCIH: chromium may slightly improve HbA1c, fasting glucose and insulin resistance in type 2 diabetes. NCCIH adds that the effects of long-term use haven’t been well investigated.
• The American Diabetes Association doesn’t recommend chromium for diabetes, and the US FDA allows only a “qualified” health claim for chromium picolinate, which calls the link to diabetes risk “highly uncertain”.

NCCIH stresses that you shouldn’t replace diabetes treatment with an unproven product. The US FDA warns about supplements that claim to be a “natural diabetes cure” or to replace diabetes medicines.

If a home meter or a blood test at the surgery shows raised blood sugar, start with your GP. Prediabetes and diabetes are managed with diet, activity and, where needed, medicines. Chromium replaces none of these.

Chromium picolinate for weight loss: the real numbers

Chromium picolinate often turns up in “fat burners”. Trials don’t show a meaningful effect:

The effect is statistically significant but hardly noticeable: your weight shifts by 1 kg or more within a single day. The Cochrane authors say there’s no reliable evidence to guide decisions on chromium picolinate for overweight adults.

If weight loss is your goal, eating patterns, activity and a conversation with your GP about weight management will do far more. If you’re tired and craving sugar, check your sleep, iron and vitamin B12.

Chromium and sugar cravings

Chromium is marketed above all as a way to “stop sugar cravings”. NIH ODS says some research suggests it may reduce food intake, hunger and cravings, but data on these effects are limited. There’s no reliable effect anyone can promise.

If you crave sugar, check that you’re sleeping enough, eating regular meals and getting enough protein and fibre. If you feel unwell after meals, ask your GP about a blood sugar test.

How much chromium to take

Trials used 200–1,000 mcg a day, usually as picolinate. If you decide to try it:

• take 200 mcg a day with food, the low end of the doses used in weight and blood sugar trials;
• set a deadline: trials lasted 12–24 weeks, and if nothing has changed after 12 weeks, there’s no point carrying on;
• don’t wash it down with an antacid for heartburn, as antacids reduce absorption; vitamin C increases it.

Read your multivitamin label too: it often already contains chromium, so you may not need a separate bottle.

Chromium side effects, interactions and who should avoid it

Chromium III is generally well tolerated. Reported side effects include stomach pain, bloating, loose stools, headache, weakness, nausea, constipation, dizziness and hives. Isolated case reports have linked chromium supplements to anaemia, low platelets, liver problems, kidney failure, muscle breakdown (rhabdomyolysis), dermatitis and hypoglycaemia. These are rare, but people with kidney or liver disease are more vulnerable.

Don’t take chromium without medical advice if:

• You have diabetes and use insulin or tablets such as metformin. The glucose-lowering effects may add up and cause a hypo.
• You take levothyroxine. In a small study, chromium picolinate reduced its absorption, so the doses need spacing apart.
• You have kidney or liver disease.
• You’re pregnant or breastfeeding. There’s little safety data for supplements.

Children shouldn’t take chromium as a separate supplement unless a doctor prescribes it. You can check combinations with other minerals in our vitamin compatibility chart.

How to choose chromium on iHerb

1. Be honest about why you want it: for weight loss and sugar cravings, the effect is minimal.
2. If you have diabetes or take levothyroxine, talk to your GP or pharmacist first.
3. Check your multivitamin: chromium may already be in it.
4. Choose chromium picolinate 200 mcg; there’s no need for 500–1,000 mcg products without medical advice.
5. Set a time limit: 12 weeks, then decide whether it’s worth continuing.

Other supplements in our energy and heart section, such as omega-3 and CoQ10, also help only in specific situations. Our Supplement Facts guide shows where to find the chromium dose on a label.