Chrome helps with the binding of insulin to its receptor
The most active form of chromium is named glucose tolerance factor (GTF)which contain s chromium, niacin, glycine, glutamic acid, and cysteine.

Chrome influences serotonin function in humans, which might explain
partially why supplements may have a mood-improving effect
A chromium-deficient diet in aminals may cause hyperglycemia, decreased growth, shortened life and arteriosclerosis in the large arteries.
In humans [mostly when receiving parenteralnutrition], we may also see weight loss and peripheral neuropathy as well as confusion.

[Mateljan]People who eat highly refined diets, especially ones rich in simple sugars, also may be at risk of deficient chromium intake. In other words, their diet choices might leave them consuming too little chromium. One research group has also suggested that these same sugar-laden diets increase the rate of chromium loss in the body, exacerbating the deficiency risk. Given the central role of chromium in blood sugar control, this two-pronged attack on chromium status is another good reason to avoid routine intake of processed, refined foods that are also high in simple sugars.

You can look up the Internet from chromium-rich foods
Especially rich are broccoli, barley and oats.

Some good chromium supplements:

Nature's Way, Chromium Picolinate, 200 mcg, 60 Capsules

Nature’s Way, Chromium Picolinate, 200 mcg, 60 Capsules

Natural Factors, Chromium GTF Chelate, 500 mcg, 90 Tablets

Natural Factors, Chromium GTF Chelate, 500 mcg, 90 Tablets

Bragg, Nutritional Yeast, 4.5 oz (127 g)

Bragg, Nutritional Yeast, 4.5 oz (127 g)