According to the official health claims of the European Food Safety Authority (EFSA):
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Chromium:
Contributes to the maintenance of normal blood glucose levels.
Contributes to normal macronutrient metabolism.
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Magnesium & Vitamins B1, B2, B3, B6:
Contribute to normal energy-yielding metabolism.
Contribute to the normal functioning of the nervous system.
Contribute to the reduction of tiredness and fatigue (Magnesium, B3, B6, B2).
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Zinc:
Contributes to normal carbohydrate, fatty acid and vitamin A metabolism.
Contributes to the protection of cells from oxidative stress.
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Copper:
Contributes to normal energy-yielding metabolism and normal iron transport in the body.