ConsumerLab.com purchased the supplements from stores, catalogues, and online retailers. The supplements were tested for the amount of potassium, potential lead contamination, and the ability of tablets to break apart in order to release ingredients. The significant lack of ingredient in one product was confirmed in a second independent laboratory.
"Our findings should be a reminder to consumers that even straightforward supplements like potassium don't always deliver what they promise," said Tod Cooperman, MD, ConsumerLab.com's president. "The supplement brand you choose may affect your well-being, particularly if you rely on it to prevent or treat potassium deficiency."