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Warning: there are supplements that have caffeine

Approximately half of the tested products contained the caffeine equivalent of up to two cups of coffee per day.

About half of adults in the United States report consuming dietary supplements regularly. What they may not know is that some of these supplements contain caffeine, even if it’s not listed on the label.

Now, Agricultural Research Service (ARS) scientists in Beltsville, Md., have analyzed a number of caffeine-containing products to explore caffeine levels in segments of the U.S. dietary supplement market.

Caffeine is a natural alkaloid that occurs not only in tea and coffee, but also in more than 60 other plants and in plant derivatives known as "botanicals." These botanicals, such as guarana, yerba mate, kola nut and green tea extract, are common dietary-supplement ingredients and are printed on the label´s ingredient list.

In the United States, there is no requirement to state the amount of caffeine present in a food, beverage or supplement on the product´s label. If caffeine in its pure form is added to a product, however, there is a requirement to add the word "caffeine" to the label´s ingredient listing.

Approximately half of the tested products contained the caffeine equivalent of up to two cups of coffee per day. Of the 28 analyzed products that voluntarily listed a caffeine amount on the label, 25 were found to contain caffeine levels within 20 percent of the label amount. (SOURCE: USDA)

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