Sen. Chuck Schumer wants to take the steam out of STEEM Caffeinated Peanut Butter.
The New York Democrat wants a "thorough" investigation of the product by the FDA.
"Caffeine is a powerful stimulant, unsafe amounts can cause adverse symptoms like increased heart rate and blood pressure and an overdose of caffeine can be fatal," Schumer said in a press release. "We must avoid exposing our families and children to the potential harmful effects that consuming caffeinated food may lead to."
STEEM says each 8-ounce jar has 1,200 mg of caffeine and each serving contains 150 mg of the stimulant, less than a cup of coffee from Starbucks or Dunkin' Donuts.
It promises buyers a dose of "protein, electrolytes, and caffeine" that results in "hours of endurance and focus, and freeing you from distractions like hunger and fatigue."
"Our goal is not to over-caffeinate people, it's to give them a more efficient alternative so they'll need less," STEEM said in an email to CNBC on Wednesday.
"Like many new products, we expect for there to be some questions and concerns, and we are more than happy to cooperate," the company statement said. "We are only marketed towards adults, and our label reflects suggested serving size, caffeine content, and our recommendations for safe use."
Schumer is not the first to raise the issue over caffeine-related products. The FDA prevented Wrigley's caffeinated gum from making it to shelves in 2013.
The FDA did not immediately respond to CNBC's request for comment Wednesday. Its offices were closed for Veterans Day.