GTF chromium comes in a variety of froms. Some is artificially produced via chelation. Others, such as the Jarrow Forumulas GTF chromium I have been getting from our friends at Utopia Silver and taking for quite awhile is made by fermenting yeast together with chromium. That is a more natural form; however, the best form is one derived solely from whole foods and even better organic whole foods such as the product I will likely be switching to made by MegaFoods:
Whole food nutrients are closest to what is found in nature and the body recognizes, absorbs and utilizes them better than other forms of nutrients.
I have no affiliation with iherb, but I am a regular customer due to their great prices and customer service. As a customer, I do have a first time buyer referral code I can pass along that gives any first time buyer $5 off their first order: X0T949 I make no money from referrals but do get a few cents worth of credit on my future orders when someone uses my code. Anyone who purchases from them can get a similar code to pass on, and I encourage them to do so - every dollar and penny helps in today's economy!