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White Plains, New York, July 19, 2017 — Dark chocolates and cocoa may contain dangerously high levels of the heavy metal cadmium, a kidney toxin, according to recent tests conducted by, an independent evaluator of health and nutrition products. Often consumed for their beneficial cocoa flavanols, which ConsumerLab also measured, chocolate and cocoa products ranged from virtually zero flavanols to levels that may provide cardiovascular and cognitive benefits. The challenge is knowing which products provide potential benefits from flavanols with minimal risk from heavy metal contamination. Labels don't provide this information, but CL's findings do.

ConsumerLab found that some popular dark chocolates and popular cocoa powders contained in excess of 20 micrograms of cadmium per serving, greatly exceeding California's 4.1 microgram limit. Products exceeding that amount require warning labels. Limits set in Canada mandate that children and adults be exposed to no more than 3 mcg and 6 mcg of cadmium per serving, respectively. The World Health Organization suggests that cocoa powders not contain more than 0.3 mcg of cadmium per gram, but ConsumerLab found that nearly every cocoa powder exceeded that limit and some contained several times that amount — including a popular national grocery store brand. However, cocoa extracts and supplements contained little or no cadmium.

Consumption of cocoa and chocolates is potentially beneficial when they provide at least 200 mg of flavanols a day. Amounts of flavanols in dark chocolate bars tested ranged from 55 mg to as much as 500 mg in a typical 40 gram serving and from 36 mg to over 200 mg in one tablespoon of cocoa powder.

Information regarding "% cocoa" (or cacao) on labels was often a poor indicator of flavanol levels, ConsumerLab found. Several bars claiming 80% to 85% cacao contained lower amounts of flavanols than bars claiming 56% to 77%. An organic label did not ensure higher flavanol content.

"Due to the cadmium and lead in cocoa powders and dark chocolates, it is best to use products that provide the most flavanols with the least contamination. Even with products having relatively little contamination, it may be best to limit daily consumption," says Tod Cooperman, M.D., President and founder of

The product test results and comparison are available now in's Dark Chocolate, Cocoa Powder, Nibs, Extracts & Supplements Review. In the review, identifies its Top Picks, i.e., the chocolate and cocoa products that provide high amounts flavanols with the lowest amounts of cadmium or other contaminants, such as lead. Top Picks included one dark chocolate, two cocoa powders, one cacao nib product, and one cocoa flavanol dietary supplement.

The review includes test results and quality comparisons for 43 products, 42 of which were selected for testing by and one of which passed the same testing through CL's voluntary Quality Certification Program. For each product, the report shows the amounts of flavanols, heavy metal contamination, caffeine, and theobromine as well as providing comparisons of calories and price. Clinical evidence for cocoa flavanols, dosage for cardiovascular and cognitive benefits, and information about safety and potential side effects are also provided.

Products included in the review are Aduna Super-Cacao, Baker's Semi-Sweet Baking Chocolate Bar, Baker's Unsweetened Baking Chocolate Bar All Natural, Bulletproof Upgraded Chocolate Powder, Cacao by Advanced Physician Formulas, Chocolove Extra Strong - 77% Cocoa Content, CocoaVia, CocoaVia Sweetened Dark Chocolate flavored mix, Dagoba Organic Chocolate Cacao Powder, Dove Dark Chocolate, Earth Circle Organics Organic Balinese Cacao Nibs, Endangered Species Chocolate Natural Dark Chocolate, Equal Exchange Chocolates Organic Panama Extra Dark, Futurebiotics Dark Chocolate Extract, Ghirardelli 100% Unsweetened Cocoa, Ghirardelli Chocolate Intense Dark Twilight Delight, Ghirardelli Intense Dark 86% Cacao, Green & Black's ORGANIC 85% Cacao Bar, Hawaii Pharm Cacao, Healthworks Cacao Powder, Hershey's Special Dark Chocolate, Hershey's Cocoa - 100% Cacao Natural Unsweetened, Hershey's Cocoa - Natural Unsweetened, Lily's Dark Chocolate - Original - Stevia Sweetened, Lindt Excellence 90% Cocoa Supreme Dark, Moser Roth Edel Bitter 85% Cacao, Navitas Naturals Cacao Nibs, Navitas Naturals Cacao Powder, Nestle Toll House Cocoa, NOW Certified Organic Cocoa Powder, NuNaturals Pure Liquid Cocoa Bean Extract, Pascha Organic Dark Chocolate - 85% Cacao, Rapunzel Organic Cocoa Powder, Reserveage CocoaWell, Solaray Cocoa, Source Naturals ChocoLift, Sunfood Raw Cacao Powder, Swanson Full Spectrum Cacao, Trader Joe's 72% Cacao Dark Chocolate, Trader Joe's Cocoa Powder Unsweetened, Trader Joe's Dark Chocolate Lover's Bar and Viva Naturals Cacao Nibs Organic.

Founded in 1999, is a leading provider of consumer information and independent evaluations of products that affect health and nutrition. Membership to is available online and provides immediate access to reviews of more than 1,000 products from over 400 brands. The company is privately held and based in Westchester, New York. It has no ownership from, or interest in, companies that manufacture, distribute, or sell consumer products.

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