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ConsumerLab.com Answers
Checking Cocoa and Cacao for Metal
Question: I asked the distributor of my cacao powder how it checks for metals. They say they do "foreign material detection" to capture "metal fragments." Is this adequate for checking cacao and cocoa for heavy metals, like cadmium, which you've found in other products? Answer: No. What that company is describing has nothing to do with detecting elemental metal contamination (as we do) or removing that contamination. The company is describing the way they detect relatively large metal fragments that may be introduced during processing. Such fragments would then, typically, be removed by sifting.
As shown in our Dark Chocolate, Cocoa Powder and Nibs Review, heavy metal contamination is very common in cocoa and cacao powders and some dark chocolates. This contamination (typically with cadmium and/or lead) is not due to metal fragments but, most likely, the absorption by cocoa plants of metals in their environment (likely from pesticides and/or volcanic soil). Unfortunately, the levels of cadmium found are often very high -- suggesting that intake should be limited, and it does not seem possible to selectively remove these metals.
I contacted various manufacturers of cacao nibs to ask for the heavy metal content. One company sent me the 'certificate of analysis & data sheet' which included info about heavy metals, and also mold / bacteria / pesticides. The analysis showed low levels of heavy metals and that is now the brand I buy. (I can supply the name of the company if that is allowed). I suggest you shop around and the manufacturers may get the message that they need to test their product and provide the information to consumers.
Although the product certainly may have changed in recent years, you may want to check what we found in Sunfood Raw Cocoa Powder when we tested it in 2014.
Nickel is another problematic ingredient in some of these cacao powders and nibs. At least, personally for me it has been. In fact, my first huge outbreak of Allergic Contact Dermatitis (that ended up being allergy against certain metals like nickel and chromium), happened during a period in which I was mixing cacoa powder into my morning yogurt.
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This CL Answer initially posted on 8/28/2018.
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