Den mest effektive formen av krom er chromium polynicotinate. The supplemet Review foundation (som er en pålitelig kilde i denne type saker) sier følgende:
"The biologically active component of glucose tolerance factor (GTF), which potentates insulin activity and is responsible for normal insulin function, is dependent on chromium. Chromium has been shown to ameliorate type II diabetes, reduce cholesterol levels, help decrease fat mass, and increase lean body mass, as well as reduce weight. These effects are in conjunction with chromium supplementation AND exercise of course. One study published in the Diabetes, Obesity and Metabolism Journal using 600 mcg of chromium (from polynicotinate) daily in overweight women showed significant weight loss and sparing of muscle mass over a two month period without any adverse effects.
Yet another study published in the Western Journal of Medicine concluded that “chromium picolinate is efficacious in lowering blood lipids in humans.”
A fairly recent study conducted at Georgetown University Medical Center and published in May 2002 showed that chromium polynicotinate can enhance insulin sensitivity and reduce age-related disorders including problems with glucose metabolism.
One thing to watch out for is taking chromium with iron as they both compete for absorption and binding to transferrin. Although not conclusive, it may be a good idea to take chromium and iron supplements separately. Based on the research and my own personal experience, I have found that one of the best times to take chromium is right after a weight training workout with a post workout shake to enhance nutrient absorption. According to most of the research, good dosages range from 400-1000 mcg of chromium in divided doses daily taken with meals (preferably from chromium polynicotinate)."
http://www.tsrf.com/supplements/supplements_chrom.htm