When ingested, sugar passes into the bloodstream. Chromium, a trace mineral, works with insulin to pass glucose from the bloodstream into the cells. It increases the sensitivity of the receptors found on cells to absorb sugar and convert it into energy. Chromium GTF is an acronym: Glucose Tolerance Factor. It is an active molecule of chromium, niacin and glutathione which the body finds easiest to absorb. Food processing destroys chromium content; however it is present in onions, tomatoes, brewer's yeast, oysters, whole grains, bran cereals and potatoes.