Caffeinated products aimed at children have become a recent marketing trend. From energy drinks to candies, health experts have warned that marketing products with high levels of caffeine to children could cause serious health problems, especially when kids and parents are not aware of the risks.

The concerns were raised anew earlier this week, when New York Senator Chuck Schumer urged the Food and Drug Administration (FDA) to investigate a new caffeinated peanut butter, according to CBS News. The product is aimed at sports and fitness consumers, but Schumer and others are concerned about high caffeine levels in a product that is so widely consumed by young children.

Just two tablespoons of the product, called STEEM Peanut Butter, contains as much caffeine as two cups of coffee, and more than five times the caffeine found in a can of cola. Developed by three Massachusetts friends, it mostly sold in fitness centers and small grocers in Massachusetts and Connecticut, and by some online retailers.

Schumer warned that too much caffeine can lead to increased blood pressure, can cause heart palpitations, and lead to other symptoms. He called on the FDA to look into the safety issues raised by caffeine in children’s products, limit the amounts allowed in food and especially snack foods, and to require warning labels.

Caffeine is the most commonly used psychoactive stimulant in the world. Recent studies have found that caffeine could pose special risks to children and adolescents, yet children and teens are the fastest-growing population of caffeine users. Regular, high-dose uses of caffeine have been linked with heart disease and other health problems.

Recently caffeinated products aimed at children as young as four-years old have been marketed, with little FDA oversight.

Although the STEEM packaging does not have warnings for use by children, it does alert consumers that pets should not eat the products, as cats and dogs cannot metabolize caffeine and it can cause them serious health problems.